Tuesday, August 24, 2010

How to Recover Corrupt MySQL Database When the Wtlicensemanager DLL File is Missing

MySQL is an open source database that is used as a means for enterprise solutions. It is widely used in various high-traffic Web applications such as Flickr, Nokia, Google, etc. One such application is Webtrends Analytics that keeps track of the user behavior on certain websites as well as on mobiles that run operating systems. However, sometimes the MySQL database do get corrupt because of various reasons such as abrupt shutdown while the database is open, virus infections, hardware malfunctioning, human errors, etc. In such cases, you should try to repair MySQL database using in-built methods. If you are unable to repair MySQL file, then you should use a third-party MySQL recovery software to recover MySQL database.

Consider a scenario wherein you have installed Webtrends Analytics in your organization to track and analyze the traffic coming in your official website. You are using MySQL as backend for the application. One day, there is a power outage and there is abrupt system shutdown. You open the system after when power is restored, but you are unable to unable to access the application. An error message is displayed, that is:
"Could not find file wtlicensemanager.dll."

Cause
The root cause for this erroneous situation is that the database table has corrupted because of abrupt system shutdown.

Resolution
To resolve this situation, you should check the state of the backup. If the backup is clean and update, you should straightaway restore the database from the backup. If not, then you should perform the following steps to repair MySQL database:

Log into the MySQL database as administrator.

Type the password, if asked to do so. To do this, type the command:
mysql-u Administrator-p

Repair the table with the following command:
Use wtmaster

REPAIR TABLE table_name:
Where, wtmaster is the name of the database.

Exit the database by typing exit and pressing the Enter key.

Try to access the database as it the error would have been resolved by now. However, if you still are getting the same error message then you should use a third-party repair mysql software to restore the corrupted database. Such MySQL recovery tools are able to restore the database without overwriting the original data.

Database Recovery for MySQL is a MySQL repair software that enables you to mysql repair database from all instances of corruption. It supports the recovery of various files such as .ibdata, .ibd, .frm, .myd, .myi, and .frm in the MyISAM and InnoDB engines. This mysql database repair tool is able to repair MySQL files and related objects such as tables, views, etc. It recovers the databases created in MySQL 4.x and 5.x versions. This tool is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

Friday, June 4, 2010

Resolving 'The log sequence number in ibdata files does not match' Error

When using InnoDB storage engine, the ibdata files serve as system tablespace containers. Along with internal system information, these files might also contain user indexes and data. If any of these file(s) get corrupt, the entire database can go inaccessible. The article mentions one of such possible scenarios and then solutions that can help you to Repair MySQL Database.

For more clarification, consider a case when a server running MySQL on InnoDB engine undergoes unexpected power outage. After this, when you attempt to start the MySQL database, it might not run and behave abruptly. On viewing the log report for the behavior, you observe the following entries along with the related time stamps and server name:

“InnoDB:The log sequence number in ibdata files does not match
InnoDB:The log sequence number in the ib_logfiles!
InnoDB: Database was not shut down normally
InnoDB:Starting crash recovery.
InnoDB:Reading tablespace information from the .ibd files...
InnoDB:Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
InnoDB: Page directory corruption: supremum not pointed to..”

The above symptoms indicate table corruption in MySQL database, which might have occurred due to last unexpected power failure. More specifically, the ibdata file(s) have gone damaged.

Solution

If you encounter above stated or similar problems, try one of the suitable methods to solve it:
  • Check for the last available backup and restore your database.
  • In case backup is incomplete, try to repair the database using 'innodb_force_recovery = 4' repair command. However, the command may fail if extent of corruption is high.
  • If Innodb repair command has failed, you can delete the ibdata tablespace and recreate it after shutting down the server, if possible. Alternatively, you can rename the ibdata and the ib_log files. But doing so causes data loss. If this is not a suitable method, try the next solution.
  • To repair the corrupt MySQL database, use a third-party MySQL Repair utility. These are special tools that can Repair MySQL Database by running the most effective and safe scanning algorithms. Since they are equipped with an interactive design, any user, even with no technical knowledge, can use them easily.
Recovery For MySQL is a high-end tool that can repair both InnoDB and MyISAM databases. The MySQL database repair utility can recover both Windows and Linux stored database. Supporting MySQL 5.x and 4.x, this read-only tool maintains the original integrity of database because of non-destructive scanning algorithms.

Resource Link: http://ezinearticles.com/?Resolving-The-Log-Sequence-Number-in-Ibdata-Files-Does-Not-Match-Error&id=4392345

Thursday, May 27, 2010

Rectifying Error Message “Unsupported extension used for table” in MySQL database

To take the advantages of the new privileges added in the new version of MySQL database, most of us upgrade our MySQL tables to new version. The utility available for upgradation of MySQL tables is known as mysql_upgrade. While upgradation has various advantages, it can also result in complete or partial loss of data from the tables. In such situations, backup enables you to restore the lost data. But, if there is no backup available or it fails to restore the required data, then you need to repair the corrupted table(s). To do so, you need to use advanced MySQL Database Repair applications.

Consider a practical scenario, where you upgraded your MySQL database from rev 4.0.13 to rev 4.0.14. After the upgradation is complete, you discover that some of your important tables are corrupted. In addition, when you attempt to open those tables, you encounter the below error message:

“e-systemusr/local/mysql/bin# ./myisamchk -a
/usr/local/mysql/var/centralf/postscobe1.MYI

myisamchk: error: 138 when opening MyISAM-table
'/usr/local/mysql/var/centralf/postscobe1.MYI'

e-systemusr/local/mysql/bin#.......”

The data saved in the MySQL tables becomes inaccessible after the occurrence of the above error message.

Cause:

The main cause behind corruption of MySQL tables is improper or interrupted upgradation of MySQL database.

Resolution:

To repair the corrupted MySQL tables and access their data, you will need to follow these steps:

· Use the below command to check and analyze the corruption in MySQL table:

Check Table tablename

· Next, run the below command to repair MySQL table:

Repair Table tablename

· You can also run the following command:

REPAIR TABLE TABLENAME USE_FRM

Though, it won’t be useful here, as it will show the tables as empty.

However, if all the above measures fall short of repairing the corrupted tables, then you will need to use advanced MySQL Repair tools. Such MySQL Database Repair utilities incorporate high end scanning methods to completely repair and restore the data stored in MySQL tables. With self-descriptive and largely graphical user interface, such repair utilities serve as user-friendly solutions that do not require any sound technical skills.

Wednesday, May 19, 2010

External Program Corrupts MyISAM Table

There can be numerous factors responsible for the corruption of MyISAM table. Few of the most common are simultaneous modification of table by two different applications (like an external program and by the server), killing of MySQLD process in the middle of a write operation, improper system shutdown, MySQL bugs, and virus attacks. A common symptom of a MyISAM table corruption is the occurrence of the error message when the user attempts to access the records saved in the table. In such cases, the records saved in the MyISAM table become inaccessible. For easy accessibility of table records in such cases, the database user needs to restore the table from an updated backup. But, if the backup is created on a storage media that is not accessible, then the user is not left with any option, but to repair the corrupted table. To effectively do so, the user needs to use an advanced MySQL Database Repair application.

As a practical case, you use myisamchk (external program) to change the records saved in the Employee (MyISAM) table. However, that same table was also being modified by the server, at the same time. However, when the myisamchk completes its task, and you attempt to view the records saved in the Employee table, you encounter the below error message:

“Incorrect key file for table: '...'. Try to repair it”

After the above error message appears, all the records of Employee table become inaccessible. Moreover, no rows are displayed in the Employee table when you run a query.

Cause:

The main cause for the corruption of the Employee table is simultaneous modification of table by both myisamchk and server.

Resolution:

To resolve MyISAM table corruption and to access the table data, you need to follow the below steps:
  • Use 'CHECK TABLE' command to check the health of the Employee table.
  • Use 'REPAIR TABLE' command to repair the Employee table.
While the above steps can repair Employee table in most cases, the possibility of these measures failing to repair the database table still persists. In such situations, you need to search for an effective MySQL Repair application. A MySQL Recovery tool uses powerful scanning methods to repair MyISAM table, irrespective of the degree of its damage.

Resource Link: http://www.progtalk.com/viewarticle.aspx?articleid=1929

Monday, May 10, 2010

MySQLD Read/Write Process Interrupted

MySQL Server (MySQLD) is an important program that performs almost all operations during a MySQL installation. The server is also responsible for managing and accessing records that are saved in MySQL data directory. This directory contains all the necessary information, such as, databases, tables, log files, and status files that are required by the user. Interruption in MySQLD process while it is performing some read or write operation on any MyISAM table results into corruption of that table. In such cases, the user encounters an error message while accessing the corrupted table, further resulting in inaccessibility of data saved in that table. To surmount such table corruption error messages, you need to restore data from an updated backup. However, if no backup of the table is available, then the user needs to repair the table using advanced MySQL Repair utility.

Consider a practical scenario, where you run an update command on a MyISAM table. While the MySQLD was performing the updates, it crashed in between due to power outage. However, next time you try to open that table, you encounter below error message:

“Incorrect key file for table: '...'. Try to repair it”

The error message means that the MyISAM table is corrupt. The message repeatedly occurs each time you try to access the database.

Cause:

The main cause of corruption is killing of MySQLD process while performing a write operation.

Resolution:

To resolve MyISAM table corruption and to access the data saved in it, you need to:

Run 'CHECK TABLE' command to verify the health of MyISAM table.
Next, run 'REPAIR TABLE' command to repair the corrupt MyISAM table.

While the above steps successfully repair most corrupted MyISAM tables, there are still some situations where these steps fail to repair. For such scenarios, you need to opt for an effective third-party MySQL Repair application. A Repair MySQL Database utility provides complete MyISAM table repair using advanced repair algorithms.

MySQL successfully repairs logically corrupted MyISAM table in only three steps. The MySQL Database Repair utility also repairs InnoDB tables. The utility provides risk-free repair as it does not makes any change in the tables. Supported by MySQL 5.x and 4.x, the tool can be installed on Windows 7, Vista, XP, 2003 and 2000 operating systems.

MySQLD Read/Write Process Interrupted

MySQL Server (MySQLD) is an important program that performs almost all operations during a MySQL installation. The server is also responsible for managing and accessing records that are saved in MySQL data directory. This directory contains all the necessary information, such as, databases, tables, log files, and status files that are required by the user. Interruption in MySQLD process while it is performing some read or write operation on any MyISAM table results into corruption of that table. In such cases, the user encounters an error message while accessing the corrupted table, further resulting in inaccessibility of data saved in that table. To surmount such table corruption error messages, you need to restore data from an updated backup. However, if no backup of the table is available, then the user needs to repair the table using advanced MySQL Repair utility.

Consider a practical scenario, where you run an update command on a MyISAM table. While the MySQLD was performing the updates, it crashed in between due to power outage. However, next time you try to open that table, you encounter below error message:

“Incorrect key file for table: '...'. Try to repair it”

The error message means that the MyISAM table is corrupt. The message repeatedly occurs each time you try to access the database.

Cause:

The main cause of corruption is killing of MySQLD process while performing a write operation.

Resolution:

To resolve MyISAM table corruption and to access the data saved in it, you need to:

Run 'CHECK TABLE' command to verify the health of MyISAM table.
Next, run 'REPAIR TABLE' command to repair the corrupt MyISAM table.

While the above steps successfully repair most corrupted MyISAM tables, there are still some situations where these steps fail to repair. For such scenarios, you need to opt for an effective third-party MySQL Repair application. A Repair MySQL Database utility provides complete MyISAM table repair using advanced repair algorithms.

MySQL successfully repairs logically corrupted MyISAM table in only three steps. The MySQL Database Repair utility also repairs InnoDB tables. The utility provides risk-free repair as it does not makes any change in the tables. Supported by MySQL 5.x and 4.x, the tool can be installed on Windows 7, Vista, XP, 2003 and 2000 operating systems.

Monday, May 3, 2010

Resolving MySQL Error- “Page Directory corruption: supremum not pointed to”

MySQL is a widely used RDBMS (Relations Database Management System), which uses two different storage engines- InnoDB and MyISAM. InnoDB is included as a standard storage engine in all modern binaries, which are distributed by MySQL AB. It has ACID (Atomicity, Consistency, Isolation, Durability) compliant-transaction support, along with the foreign key support. However in some situations, you may encounter errors while starting the InnoDB database that indicate database corruption. Corruption renders your database tables inaccessible and cause serious data loss situations. In order to retrieve the damaged database tables you need to restore them from an updated backup. But, if the backup is unavailable, go for MySQL Repair solutions.

In a practical scenario, you may encounter startup failure of the InnoDB storage engine with “Signal 11”, prefaced by an unexpected shutdown of the InnoDB. At the same time, you may also come across the below error message:

“Page directory corruption: supremum not pointed to.”

The server startup variants can not complete successfully. After startup failure, you see the log entries in .err file of MySQL application, similar to the following one:

“InnoDB: Error: all log files must be created at the same time.
InnoDB: All log files must be created also in database creation.
InnoDB: If you want bigger or smaller log files, shut down the
InnoDB: database and make sure there were no errors in shutdown.
InnoDB: Then delete the existing log files. Edit the .cnf file
InnoDB: and start the database again.
060218 16:45:01 [ERROR] Default storage engine (InnoDB) is not available
060218 16:45:01 [ERROR] Aborting”

Cause

This issue is caused by the corruption of page directory of InnoDB storage engine. The same problem may also occur if the storage engine or database are corrupted.

This overall behavior of MySQL application indicates database corruption and needs MySQL Repair.

Resolution

You can sort out this problem by replacing the MySQL Server dir with the most recent backup. In case the backup is not updated or is not available in place, situations can be quite difficult to handle manually.

In such circumstances, one has to Repair MySQL Database using third party applications. They are particularly designed to methodically scan the database tables and repair, and restore them. You can Recover MySQL database on your own using these self-descriptive applications having interactive user interface.

MySQL is an advanced software that successfully restores damaged database in all corruption scenarios. It works well with MySQL 5.x and 4.x. The software supports both InnoDB and MyISAM storage engines and restores all database objects.

Friday, April 30, 2010

Missing or Deleted .frm File May Cause Table Corruption in MySQL

MySQL Server database stores data dictionary information in the .frm files that it stores in database directories. On the other hand, InnoDB storage engine keeps information in individual data dictionary in tablespace files. When you move the .frm file or the server gets crashed in halfway of any data dictionary procedure, locations of .frm files might end up out of the synchrony with locations recorded in InnoDB inner data dictionary. In such circumstances, the database may become inconsistent and inaccessible. At this point, you need to opt for MySQL Recovery to gain access of your valuable data in MySQL database.

The out-of-sync data dictionary situation can be indicated by various symptoms. One symptom of this problem is that the “Create Table” statement does not work. When this situation occurs, you should check the error log of server. If the error log indicates that table already exists in InnoDB internal data dictionary, there is an orphaned table in InnoDB tablespace files, which does not have corresponding .frm file.

You are allowed to drop orphaned table, using the steps given in error message. If you are unable to run “Drop Table” command successfully, the issue may be caused by name completion in MySQL client. To sort out this issue, start MySQL client with -skip-auto-rehash option and try using Drop Table command.

Another symptom of the out-of-sync issue with data dictionary is the error message that MySQL gives when you try to open a database table:

“ERROR 1016: Can't open file: 'child2.InnoDB'. (errno: 1.”
In error log of MySQL, you may find the below message:
“InnoDB: Cannot find table test/child2 from the internal data dictionary
InnoDB: of InnoDB though the .frm file for the table exists. Maybe you
InnoDB: have deleted and recreated InnoDB data files but have forgotten
InnoDB: to delete the corresponding .frm files of InnoDB tables?”

This behavior of MySQL database indicates corruption to the database tables and you need to restore them from backup to Repair MySQL Database.

In the else case, you can use third-party MySQL Repair software. These applications are able to repair and restore damaged MySQL database table in original state, without altering original data and structure. The absolutely Recover MySQL database through high-end scanning techniques, with all of the database objects.

MySQL is a powerful application to restore all of the MySQL database objects such as table, tablespace, queries, report, form, view, and more. The software is designed for MySQL 5.x and 4.x. It works well with both InnoDB and MyISAM storage engines of MySQL.

Wednesday, April 28, 2010

MySQL Recovery for InnoDB Storage Engine to Fix Tablespace Corruption

Are you encountering assertion failure errors in MySQL database? Are you unable to access your MySQL database due to corrupt InnoDB Tablespace? Such situations occur due to MySQL database corruption. This behavior renders your MySQL database inaccessible. It leads to critical data loss situations and requires you to restore the database from the most recent backup. However, in case the backup isn't updated or you don't have a backup, you are requited to carry out MySQL Repair to gain access of the database.

In a practical scenario, you may encounter the below error message after InnoDB Tablespace corruption:

“InnoDB: Database page corruption on disk or a failed
InnoDB: file read of page 7.
InnoDB: You may have to recover from a backup.
080703 23:46:16 InnoDB: Page dump in ASCII and hex (16384 bytes)”

This problem generally occurs if you are running the MySQL database with InnoDB engine tables and you have crappy hardware, kernel bug, drive bug, power outages or MySQL application bugs. The database crashes with assertion failure. At this point, you need to find the root cause of the problem and Repair MySQL Database by sorting it out.

Cause

There are various things, that, if corrupt may lead to this problem. The most important among them is corruption of the clustered key index. It is quite complicated, as compared to the simple data corruption that can be handled easily using the OPTIMIZE TABLE command. Corruption of any of the database objects may make it impossible for the database to locate and access files or tables.

Resolution

You can try the following things to work around this problem and access your database:

Check the database tables in general operation mode. This method can fix the problem if InnoDB crashes due to Checksum errors.
Run innodb_force_recovery to force InnoDB storage engine to start by preventing the background operations.

If none of the above methods work, you should use MySQL Repair software, to repair and restore damaged MySQL database.

The software Repair MySQL Database database using high-end scanning techniques. They enable you to perform absolute recovery in a quick and easy way as they have simple and rich graphical user interface. With read-only behavior, integrity of your database is always preserved by these software.

Stellar Phoenix Database Recovery for MySQL is the most advanced utility that ensures absolute restore of your damaged MySQL database files. The software supports recovery from both InnoDB and MyISAM storage engines. It works well with MySQL 5.x and 4.x.

Tuesday, April 27, 2010

How To Recover Corrupted/Crashed InnoDB Database?

Are you a frequent user of the transaction database characteristic in MySQL? If 'Yes', then you must be quite familiar with the InnoDB storage engine of MySQL. InnoDB offers transaction safe database, along with the BDB, within MySQL environment. However, in some cases, this database engine may get damaged due a number of reasons, and leads to critical data loss situations. At this point, you are required to go for MySQL Repair solutions to get your precious data recovered.

A MySQL user or database administrator would never want bad things to happen, but they do. Sometimes, internal system malfunction, virus infection, human errors, power outages, improper system shutdown, or even operating system malfunction make your MySQL database corrupted or crashed. At this point, it becomes essential to identify the actual cause of the database corruption and perform MySQL Recovery by sorting it out.

How to Find Out Damaged MySQL Database:

All of a sudden, you may encounter query errors on some or all pages of your website. If your MySQL is configured well, you are required to be pretty cautious when you come across the below error message:

ERROR 2006 (HY000): MySQL server has gone away

If the above error occurs repeatedly, further investigation is required. First investigation point for this is the application log. If your installation is standard, you can find the MySQL log file at /var/log/mysqld.log.

The error is related to the below errors. You can run a simple command “OPTIMIZE TABLE tablename” and verify if you experience:

ERROR 1030 (HY000): Got error -1 from storage engine (It means that data has not been recovered from the previous database corruption or crash).
ERROR 1030 (HY000): Got error 28 from storage engine (It means the storage device is full).

If you encounter the first error message, you need to restore your database from the most recent backup. In case the backup is not available, you have to Repair MySQL Database using reliable and effective tools.

The Repair MySQL Database applications ensure complete recovery in all cases of MySQL database corruption as they perform in-depth scan of entire database through high-end scanning techniques. They come equipped with simple and self-descriptive graphical user interface to enable easy recovery, without demanding sound and prior technical skills. These software preserve the integrity of database as they have read-only and non-destructive conduct.

MySQL is an excellent solution to repair and restore damaged MySQL database in all cases. It supports both InnoDB and MyISAM storage engines of MySQL. The software works well with MySQL 5.x and 4.x.

Error 145 Occurs while accessing Merge Table

A 'merge table' in MySQL is primarily a collection of MyISAM tables. These tables are identical and can be used as single table. A database user can create a merge table by specifying a Union operator between the used MyISAM tables. The user can also apply all kinds of operations, such as, select, insert, update, and delete on the merge table. Just like any other table, these tables can also be corrupted due to various internal and external reasons. In most cases the user encounters an error message after merge table corruption. This message does not allows the user to access the records saved in the merge table. To access the records after merge table corruption, the user needs to restore data from updated table backup. But, if the user has not maintained any backup, then the merge table needs to be repaired using advanced third-party MySQL Repair application.

Consider a practical case, where you have a large merge table containing thousands of records. However, due to a server crash, the table gets corrupted. Now, when you attempt to access the records saved in that particular merge table, you receive an error message:

“ERROR 1016 (HY000): Can't open file: 'merge_employee.MRG' (errno: 145)”

On viewing the server error log, you find the following message:

“060601 21:42:20 [ERROR] /usr/sbin/mysqld: Can't open file: 'mailer_mailsent.MRG' (errno: 145)”

After this error message appears, the data saved in the merge table gets inaccessible.

Resolution:

To resolve the above error message and to access the table data, follow the below mentioned measures:

1.Run Check table command to identify the level of corruption.
2.Run Repair table command to repair the table.

If the problem persists and the table remains corrupt even after following the above steps, then you will need to search for a powerful MySQL Database Repair application to repair the corrupt table. A Repair MySQL Database utility uses latest repairing procedures to comprehensively repair the corrupt table. The tool ensures risk-free repair of tables that allow even a layman to perform MySQL table repair.

MySQL fulfills all the requirements of being the finest MySQL Repair application. The read-only repair tool repairs almost all database components created in MyISAM and InnoDB storage engines. The software is designed for Windows 7, Vista, XP, 2003 and 2000 operating systems. It supports MySQL 5.x and 4.x.

Sunday, April 25, 2010

Fixing “Unknown Table” Error post MySQL database corruption

InnoDB database engine saves all the data in the form of pages, linked in a B-tree structure. The pages in the B-tree structure are arranged in a way that each page has it entry in its Index node. These pages contain actual data stored in the InnoDB tables. Since these tables are updated very frequently, it requires special treatment to handle the B-tree structure. Corruption in this structure can occur due to various reasons like, MySQLD improper shutdown, virus attack, operating system malfunction, and human errors. In such situations, the data saved in the InnoDB table becomes inaccessible. To access the data after InnoDB corruption, a simple way is to restore the data from an updated backup. However, inaccessibility of table backup or backup falling short of restoring the required data, requires an advanced third-party MySQL Repair application.

As a practical case, you encounter the underneath error message while trying to access the InnoDB table:

“#1051 - Unknown table 'table name'”
'table name' is the name of the table which is corrupted

The above error message appears every time you attempt to access that table. It does not allow you to access the records saved in the table.

Cause:

The reason behind the above error message is corruption/damage in InnoDB table.

Resolution:

To isolate the above error message and to access the table records, use the below command:

“ innodb_force_recovery = 4 ”

The above command works in most cases. It comprehensively repairs the corrupted table and allows
makes all the records accessible. However, if the above command fails to repair the table and the above
error message persists, then you will need to use a powerful MySQL Repair application.

A Repair MySQL Database repair tool is a third-party application that scans the table by employing high-end scanning algorithms. The repair application is built with interactive user-documentation that makes even an novice user to understand and perform the repair process. These tools are completely non-destructive in nature as the repairing is performed without modifying the original data.

MySQL, a powerful application used world-wide by most of the MySQL database users, ensures complete repair of tables created in MyISAM or InnoDB storage engines. The MySQL Repair tool is designed for MySQL 5.x and 4.x. It is compatible with Windows 7, Vista, XP, 2003 and 2000 operating systems.

Thursday, April 22, 2010

Resolving “No MySQL pid file found” Error Message

MySQL database corruption mostly results into displaying of an error message at the time of mounting the database. For detailed reason of the MySQL database corruption, you can view the MySQL error log. In most cases of log description, a solution is also mentioned along with the cause of the error. If the solution works, then you can continue working on your database. However, if the solution is not provided or fails to resolve the error message, then an ideal way is to restore the data from an updated backup. But if in case, the backup file is not available or backup falls short to restore the required data, then you will need to use advanced MySQL Repair application to repair the corrupted database.

Consider a practical case, where the underneath error message pops up when you attempt to mount your MySQL database:

“No MySQL pid file found”

On viewing the MySQL error log, below information is displayed:

“InnoDB: Page may be an update undo log page. Page may be an index page where index id is 0 40
InnoDB: (index `PRIMARY` of table `piprd/Broadcast`) database page corruption on disk or a failed
InnoDB: file read of page 2280. You may have to recover from a backup.
InnoDB: It is also possible that your operating system has corrupted its own file cache and
InnoDB: rebooting your computer removes the error.
InnoDB: If the corrupt page is an index page you can also try to fix the corruption
InnoDB: by dumping, dropping, and reimporting the corrupt table. You can use CHECK
InnoDB: TABLE to scan your table for corruption”

The error log clearly states that the database is corrupted. Few reasons for corruption could be operating system corruption (also mentioned in error message), MySQLD improper shutdown, and virus attack.

Resolution:

To resolve the above error message and to access the database components, you will need to look for efficient Repair MySQL Database software. A MySQL Repair tool should only be purchased only after the testing its demo version.

MySQL is a powerful repair tool whose demo version allows you to preview all the repairable InnoDB and MyISAM database components. Compatible with MySQL 5.x and 4.x, the MySQL Repair utility supports Windows 7, Vista, XP, 2003 and 2000 operating systems. The tool is completely non-destructive.

Wednesday, April 21, 2010

Repair MySQL table with damaged Index

MySQL database table can be corrupted due to to various reasons, one of them being the damage of Index. A table index, usually created at the time of creation of table, is a set of pointers that point towards particular rows in a table. A table Index in MySQL is primarily used to improve the performance of the database by increasing the speed of your MySQL queries. MySQL table, once corrupted due to any reason, makes the records saved in it inaccessible. In such cases, the records can be easily accessed by restoration from an updated backup. However, if the backup does not restore the required table records, then it is of no use. A better way to overcome such table corruption scenarios is by repairing the table by using an advanced Repair MySQL Database application.

To illustrate the above scenario, picture a case where you encounter the below error message when you try to access your MySQL table:

“[Incorrect file format 'TABLENAME']”

After the above table error message pops up, the data saved in your MySQL table becomes inaccessible.

Cause:

The fundamental reason for the occurrence of the above error message is corruption of your MySQL table due to damage of its index.

Resolution:

The above table error message can be resolved within phpMyAdmin. To do so, you will need to follow the below steps:

1.Login into phpMyAdmin by entering your User name and Password.
2.Select the corrupted MySQL database table.
3.Enter the below code for the database table:
repair table employee use_frm;

The above steps resolve the above problem in most cases. However, if the above steps fail, then you will need to use an advanced MySQL Database Repair application to repair your table.

A third-party MySQL Repair utility is a complete solution to repair corrupt MySQL table, irrespective of their reason of damage. The repair utility uses powerful repairing methods – developed by database repair experts – to repair almost all MySQL database components. It can be downloaded from the Internet and allows even a novice user to perform the repair.

MySQL is a powerful application used by most of the MySQL database users to repair their database components. With repair of both MyISAM or InnoDB tables, the software is compatible with MySQL 5.x and 4.x. The MySQL Repair utility supports Windows 7, Vista, XP, 2003 and 2000.

Tuesday, April 20, 2010

Three ways to Repair MyISAM tables

Corruption in MyISAM tables is a nightmare for almost every Database Administrator (DBA). These tables are one of the most important components to save personal and professional data, and corruption of these tables primarily result into inaccessibility of all that data. In such cases, a valid database backup allows you to restore the data and access the table records. While the backup file is mostly saved on a different storage media, the possibilities of its corruption still exist. In such cases, you will need to perform Repair MySQL Database.

Below are the few error messages that enable you to identify that your MyISAM table (employee) is corrupt:

“employee.frm is locked against change”
Or
“Can't find file employee.MYI (Errcode: nnn)”
Or
“Got error employee from table handler”

The data stored in the employee table becomes inaccessible after the above error message pops up. In addition, you receive any of the above error message each time you attempt to access the table.

Cause:

Few main reasons for the employee table corruption are improper MySQL Server shutdown, virus infection, file system damage, and human errors.

Resolution:

To resolve the above error messages and access the employee table records, you will need to follow the below measures:

You can use an in-built tool “myisamchk” to check and repair the employee table. The command-line tool scans the database components, identifies the exact cause of corruption, and repair the tables.

You can use various SQL commands to repair the employee table. These commands are CHECK TABLE, REPAIR TABLE, and OPTIMIZE TABLE.

The probabilities of employee table not being repaired by any of the above steps is very less, but still exists. Such cases occur when the table is badly corrupted. To repair the table in such situations, you will need to use an advanced third-party Repair MySQL tool.

Monday, April 19, 2010

MySQL Database Table corrupt after running a Procedure

A procedure is a group of specific set of actions and operations to perform a particular task. These actions consist of various queries that fetch data from various tables connected to a database. While creating and running a procedure makes your work easy, it can also result into corruption of a database table. This occurs when either of the queries in the procedure is fetching records from two tables, one of which is corrupted due to virus infection. In such situations, an ideal way is to delete the virus infected database table and restore the table from an virus-free and latest database backup. However, if in case the database backup is unable to restore the required table or the backup is corrupted/damaged, then you will need to use a third-party MySQL Repair application to repair the corrupt table.

Picture a scenario, where you have created a below script to perform certain operation:

Create Procedure
Run Procedure
Drop Procedure

However, after the above script runs, you find that one of your table always gets corrupted. Furthermore, the records stored on that table become inaccessible after it gets damaged.

Cause:

The table gets corrupted if there is query that relates it with another table, which is virus-infected. To prevent the table from being corrupted, you should always scan your database components with an up-to-date anti-virus software.

Resolution:

To resolve the above error message and to repair the table, you will need to run the “myisamchk” command. While the above command repair the table in most cases, it fails to repair the tables in case of severe corruption. For repairing such tables, you will need to use an advanced Repair MySQL Database application.

Easily downloaded from the Internet, these MySQL Repair applications can repair MYSQL database tables, regardless of their extent of corruption. These tools are primarily incorporated with an interactive user-documentation so that even a novice user can perform the repair task. Such repair utilities use high-end scanning methods to repair the corrupt table and also allow you to restore the repaired table on your desired location.

MySQL, an easy-to-afford MySQL Database Repair application, provides systematic repair of corrupt MySQL database tables, created either in MyISAM or InnoDB storage engines. Designed for Windows 7, Vista, XP, 2003 and 2000 operating systems, the repair software supports MySQL 5.x and 4.x.

Fixing “Tablespace Error” Post power failure

A tablespace in MySQL database is a storage destination where the data related to database objects (tables, indexes, etc.) is kept. A MySQL database consists of at least one tablespace, which can also be increased if required. While these tablespaces increase the performance of the database, corruption in these logical storage units can result in unmountability of database, further leading to inaccessibility of database records. One of the main reasons for the corruption of a tablespace is improper shutdown of MySQL Server due to power failure. In most of these situations, you receive an error message. For complete accessibility of database records and to surpass the error message, an ideal way is to restore the data from an updated backup. But, the possibilities of backup not being able to restore the desired content always persists. In such cases, you will need use an advanced MySQL Repair tool.

Consider a practical scenario, where your running MySQL server experiences a power failure. The next time you attempt to mount your database, you receive the below error message:

“InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace.”

After the above error message pops up, the database becomes unmountable. This, further results in inaccessibility of all the records. In addition, the above error message appears every time you try to mount your MySQL database.

Cause:

As discussed in the error message, the InnoDB database tablespaces are corrupt due to improper server shutdown.

Resolution:

To resolve the above tablespace error message and to access the database, you will need to use follow the below steps:

Restart MySQL using innodb_force_recovery = 4 option.
Restart MySQL using innodb_force_recovery = 6 option.
Run 'reiserfsck' to fix corrupt file system.

However, if the above resolutions fail to resolve the above error message, then you will need to use an effective MySQL Repair tool to repair the database. Such Repair MySQL Database utilities can be downloaded from the Internet and used even by a novice user.

Friday, April 16, 2010

Fixing “Key in wrong position...” Error Message

MySQL database table, a major storage component for all MySQL users to store their records, can be corrupted due to various factors. Few of the most common include improper system shutdown, fatal virus attacks, file system damage, application malfunction, and human errors. An error message while accessing the table, clearly indicates that it has been corrupted. This error message can be a huge cause of concern in case the table contains some critical data. To overcome such table corruption scenarios, you can always use an adequate database backup. But if in case, the database backup gets damaged or is inaccessible, then you will need to repair the corrupt table. For comprehensive repair, you will need to opt for an advanced third-party Repair MySQL Database application.

Consider a practical scenario, where you attempt to open the table and an error message pops up stating that the table is corrupt. Furthermore, when you attempt to run CHECK TABLE command on that table, you receive another error message:

“Employee check error Key in wrong position at page 4096
Employee check error Corrupt”

After the above error message appears, the data stored in the table becomes inaccessible. You encounter the same error message each time you attempt to run the CHECK TABLE command.

Cause:

The above error message appears when the Employee table is severely corrupted.

Resolution:

The resolution for the above error message is restoration from an updated backup. But, there are many case studies where the database user forgets to create a database backup on regular basis. For such situations, these users you can use an advanced MySQL Database Repair application.

A third-party MySQL Repair utility performs systematic repair of corrupt MySQL tables by using effective scanning methods. The tool can be easily understood as it comes along with highly interactive user-interface and documentation. The repair application does not overwrite, delete, or modify the original data stored in the table. The software allows you to save the repaired table on default or new destination.

Thursday, April 15, 2010

Repairing Corrupt MySQL InnoDB table

MySQL InnoDB table corruption or damage results in inaccessibility of all its stored records. There can be different causes for corruption in table including improper system shutdown, fatal virus hit, application malfunction, and human errors. However, the most common way to identify that your database has been corrupted is when you view an error message, instead of the records. Restoration of data from an updated backup allows you to overcome such error messages. But restoration process can only be performed in case the user has maintained a valid backup. If you have not created a backup or the backup is corrupted, then you will need to repair the corrupt database table using an advanced third-party Repair MySQL Database tool.

Consider a practical case, where you receive the below error message when you attempt to access the records saved in the MySQL table (employee):

“#1051 - Unknown table 'employee'”

After the above error message appears, the data stored in the “employee” table gets inaccessible. Furthermore, the error message pops up whenever you open the table.

Reason:

The main reason for the occurrence of the above error message is corruption of employee table.

Resolution:

The resolution for the above error message can be achieved by following steps:

1.The first steps is to add “innodb_force_recovery=4” to /etc/my.cnf configuration file.
2.Restart MySQL and dump the employee table.
3.Shutdown your database and erase the data directory.
4.Create default tables using mysql_install_db.
5.Remove “innodb_force_recovery=4” from /etc/my.cnf configuration file.
6.Restore the data from a valid backup.

The above steps fail to resolve your issue if you have not created a backup. In such situations, you will need to search for effective MySQL Repair tool that can repair the corrupt table. Such Repair MySQL tools are non-destructive in nature and perform repair without modifying the original data. The repair utilities employ intensive scanning methods to systematically repair the database and restore it on the user-specified destination. These tools can easily be used by both non-technical users.

Tuesday, April 13, 2010

MySQL Database Table Repair post Power Outage

One of the most common reason for improper shutdown of MySQL Server is power outage. A power failure primarily results in breaking the continuity of the ongoing process resulting in the corruption of MySQL database. In most cases, when you attempt to access the MySQL database after power outage, you encounter an error message that does not allow the database to mount eventually resulting in inaccessibility of records. A standard way to overcome the problems created due to error message is by restoring the data from a valid and updated backup. However, there are possibilities that your backup might get corrupted or damaged. In such situations, only a powerful third-party MySQL Repair software can help.

Consider a practical scenario, where you encountered power outage while you were updating some records in Employee table. However, when you restart your system and run a query to view the updations made in Employee table, you encounter the below error message:

"Checking MyISAM file: ric200503 Data records: 0 Deleted blocks: 0 .... MyISAM-table 'Employee' is corrupted Fix it using switch "-r" or "-o""

Data stored in Employee table becomes inaccessible after the above error message appears. Furthermore, the above error message pops up every time you attempt to access Employee table.

Cause:

The root cause for the occurrence of the above error message is table corruption due to power outage.

Resolution:

For complete troubleshooting of the above error message and to access the Employee table records, you will need to repair the table using the underneath command:

Repair Table Employee

In most cases, the above command resolves the corruption in Employee table and provides access to the data stored in it. However, if the above command falls short to repair, then you will need to search for powerful third-party MySQL Repair application. These MySQL Recovery utilities employ high-end scanning and repairing algorithms to repair corrupted tables and restore them on default or new destination. With to-the-point user documentation, non destructive nature, and user-friendly interface, these tools ensure fast, easy and complete database repair.

Sunday, April 11, 2010

MySQL table Repairing process Halts

A severely corrupted MySQL database table is always difficult to repair. Corruption in table not only stops the database to mount, but also makes the records saved in the table inaccessible. Few major causes for severe corruption of MySQL database tables are improper system shutdown, software bugs, and human errors. To surpass the effects of table corruption, restoration from a complete and valid database backup always helps. But, the possibilities for backup being corrupted or damaged always exist. In such situations, an ideal way to access your data is by using an advanced third-party MySQL Repair application.

Consider a practical scenario, where you run a query to display the contents saved in a particular table and you encounter an error message stating that the table has been severely corrupted. To repair your corrupted table, you run the below command.

Repair Table Tablename

The above command ran for approximately 15 hours and didn't stopped until you forcefully stopped the never-ending process. Furthermore, while the repairing process was in progress, it occupied all your disk space. The below messages displayed during the repairing process:

-rw-r----- 1 mysql mysql 8.9G May 15 19:52 post.MYD -rw-r----- 1 mysql mysql 7.8G May 17 18:19 post.MYI -rw-r----- 1 root root 214M May 17 18:19 post.TMD -rw-r----- 1 mysql mysql 9.0K Dec 6 11:49 post.frm

The above message indicate that the table from which you want to execute the data is beyond repair of above command. To access your inaccessible records in such situations, you can restore the data from an updated backup. However, in case of no backup availability, only an advanced MySQL Database Repair tool can help.

Such MySQL Recovery tools use high end procedures to repair your corrupted tables and restore them on default or new user-specified location. The database repair software come with highly interactive user-documentation, which guides you through a complete repair process. The non-destructive nature of the software ensures risk-free recovery of recovered data by leaving the original database file untouched and unmodified.

Thursday, April 8, 2010

Myisamchk fails to repair MySQL Database Tables

Whenever, you create a Table in MySQL database, it creates three different files (FRM, MYD, and MYI) for storing table format, data, and Index. Corruption in MySQL database tables happens very easily. Few major reasons for table corruption are improper mysqld shutdown, software bugs, and human errors. Once the tables are corrupted, an error message pops up stating the cause for its occurrence. This error message not only makes the database unmountable, but also makes the records stored in the table inaccessible. The error message leaves you in an unrecoverable position leaving you with no option, but to restore data from an updated backup. While restoration of data from an updated backup helps you to recover from any corruption scenario, the possibilities of backup being corrupt or damaged always persist. In such situations, only a powerful third-party MySQL Repair software helps.

Consider a practical situation, where your table is corrupted and you experience the below error message:

“undef error - DBD::mysql::db selectrow_array failed: Table 'attach1_data' is marked as crashed and should be repaired [for Statement "SELECT LENGTH(thedata) FROM attach1_data WHERE id = ?"] at Bugzilla/Attachment.pm line 344 Bugzilla::Attachment::datasize('Bugzilla::Attachment=HASH(0x9df119c)') called”

From the error message, it is crystal clear that the table “attach1_data” is corrupted and need to be repaired. The above error message pops up every time you endeavor to access the records stored in “attach1_data” table.

How to Resolve?

To resolve the above error message and access the records stored in “attach1_data” table, follow the underneath steps:

Check the table by using myisamchk command.
Repair the table using myisamchk -r command.

Note: To avoid “clients are using or haven’t closed the table properly” error message, then perform repair after shutting down mysqld.

Myisamchk command repairs corrupted tables in most circumstances. But if the command repair command fails to repair and the error message remains, then you will need make a selection of an advanced MySQL Recovery software that repair your database. These MySQL Repair tools use effective scanning algorithms to perform standardized repair of corrupt tables.

Tuesday, April 6, 2010

Prevention tips for MySQL database corruption

A corrupted MySQL database is a database in which some of the records are lost and you are not able to perform any functions. While the causes for MySQL database corruption might vary, the result in most cases remains the same - unmountable MySQL database. The best and easiest way to avoid corruption is by following some prevention tips. But, if in case, the database corrupts even after following the prevention tips, then the only to access MySQL database records is by restoring the data from an updated backup. However, if no backup is available or backup falls short to restore the required data, then you will need to opt for an effective MySQL Repair tool.

MySQL database corruption could be a result of numerous factors, to include:

Using "killall -9 mysqld" command to shutdown the server and killing all the ongoing MySQL processes. Improper shutdown of the MySQL database server due to power outage. Fiddling with the data files, especially under the feet of mysqld Internal error in MySQL database server Kernel Panic Virus Attack

Prevention Tips:

Always test the kernel with mysqld. Always have a branded UPS to resume all your operations when you encounter a power outage. In case of slightest of doubt of MySQL database corruption, run the below commands: CHECK TABLE tablename REPAIR TABLE tablename Always maintain an updated backup. It is advisable to create database backup at least once in a week. Always have a powerful anti-virus software installed in your system.

The above prevention tips allow you to save your data from most of the corruption scenarios. However, if these prevention fail to save your MySQL database from corruption, and you have not created any backup, then you will need to opt for advanced MySQL Recovery software. Such MySQL Repair applications employ intensive scanning techniques to scan and repair corrupted MySQL database. The easy-to-understand graphical user documentation of the software makes it usable to both technical and non-technical users.

Sunday, April 4, 2010

Resolving “Checking for corrupt, not cleanly...” Error Message in MySQL database

One of the major reasons for corruption of MySQL database tables is improper or unexpected shutdown of MySQL Server. An improper shutdown can occur due to power outage or human errors. In most of these situations, you encounter an error message that makes the data stored in your MySQL tables inaccessible. To access the data stored in the tables, a perfect and easy way is to restore the data from an updated backup. But if in case, the data backup itself gets corrupted or is unable to restore the required data, then you will need to use advanced MySQL Repair application that can repair the corrupted database and recover inaccessible tables.

Consider a practical example, where you encounter the below error message when you attempt to mount your MySQL database after improper server shutdown:

“Checking for corrupt, not cleanly closed and upgrade needing tables.”

The above error message appears each time you attempt to access the records saved in the MySQL database tables. Furthermore, the error message makes the data stored in the tables inaccessible.

Cause:

The root cause for the occurrence of the above error message is corruption of MySQL database due to improper system shutdown.

Resolution:

To resolve the above error and access the records, you will need to follow the below measures:

Check for the extent of table corruption using the below command:

CHECK TABLE

After checking the extent of corruption, run the below command to repair the tables:

REPAIR TABLE

The above resolution works in most situations and makes the records accessible. But, if in case the resolution fails to resolve the issue and you encounter the above error message again, then you will need to use advance MySQL Recovery software. These MySQL Repair tools use effective algorithms to orderly repair the corrupted tables. Built with highly interactive user-interface, the tool is easily understood by both technical and non-technical users. These non-destructive database repair utilities perform safe repair of database by not modifying the original database.

Wednesday, March 31, 2010

Repairing corrupt MySQL tables

MySQL table corruption can be easily identified. Few symptoms that allow you to identify table corruption are - queries stop fetching records, display of an error message, and display of incorrect records. The above symptoms primarily results in inaccessibility of records stored in MySQL tables. In such situations, a complete database backup allows you to overcome the problem by restoring all the required data. However, there is a possibility that the data backup is corrupted or does not restore the required information. For absolute repair of corrupted tables under such situations, you will need to opt for advanced MySQL Repair software.

Consider a practical example, where you encounter the below error message when you attempt to access the records saved in Employee table:

"Unexpected end of File"

The above error message makes the data stored in the Employee database records inaccessible. In addition, the same error message re-appears each time you attempt to access the records saved in the Employee table.

Cause:

The root cause for the occurrence of the above error message is the corruption of Employee table. Few main reasons for table corruption can be unexpected system shut down, improper locking of tables, header corruption, virus attack, and human errors.

Resolution:

To resolve the above error and access the records saved in Employee table, you will need to follow the below measures:

Check the Employee table for the extent of corruption using the below command: CHECK TABLE Employee

If the above command reports corruption, then you will need to repair the table by using the below command:

REPAIR TABLE Employee

In most cases, table corruption gets resolved by using the above command. However, if the problem persists and the same error message appears again while accessing the records, then you will need to use advanced MySQL Database Repair software. Such read only MySQL Recovery utilities employ powerful procedures to to systematically scan and repair the corrupted tables. These repair tools are built with highly interactive user-interface and can be used by both technical and non-technical users.

Wednesday, March 24, 2010

Resolving Error Codes 126, 127, 144, and 145 in MySQL database

Sometimes, when you attempt to access the records saved in MySQL database table, there is a possibility of getting an error message. The error message primarily occurs due to MySQL database corruption. Few main causes of MySQL database corruption are server crash, MySQL bug, damaged table handler, and many more similar reasons. In such situation, the records stored in your MySQL database components become inaccessible. For complete access of records in such scenarios, an ideal way is to restore the data from an updated and valid backup. However, if no backup is available or backup falls short to restore the correct records, then you will need to opt for advanced third party MySQL Repair application.

Consider a practical scenario, where you attempt to mount your MySQL database (Employee) and receive any of the below error messages:

“Got error 126 from table handler”

Or

“Got error 127 from table handler”

Or

“Got error 144 from table handler”

Or

“Got error 145 from table handler”

Data stored in the Employee database becomes inaccessible after any of the above error message appears. In addition, the same error messages appear each time you attempt to mount your Employee database.

Cause:

The root cause for the occurrence of the above error message is corruption of Employee database after damage in table handler.

Resolution:

To resolve the above error message and access the records stored in the Employee database, you will need to run the below command to analyze the below command to check the extent of Employee database corruption:

“Check Table tablename”

After analyzing the extent of Access database corruption, you will need to use the below repair command:

“Repair Table tablename”

In most cases, the above resolution resolves your issue and the database becomes inaccessible. However, if the database remains inaccessible and you still encounter the above error message, then you will need to use advanced MySQL Database Recovery software. These MySQL Recovery utilities provide secure, comprehensive, and fast database repair by maintaining the intactness of data.

Saturday, March 20, 2010

Resolving Error 29 in MySQL Database

Mysqldump is a backup program that allows you to dump MySQL database(s) or transfer the records to another SQL Server. The dump contains SQL statements that can either populate the table or create the table. While the backup program creates backup in most cases, the program gets halted when your database gets corrupted or damaged. In most of these situations, you encounter an error message that does not allow you to create a backup. To overcome these situations, you will need to use an advanced MySQL Repair tool to repair the corrupted or damaged MySQL database.

Consider a practical scenario, where you try and do a mysqldump, and encounter the below error message:

[root@www diaendomet]# mysqldump -ucojjohealth -p --all-databases >
alldatabases.sql
Enter password:
mysqldump: Got error: 29: File '../diaendomet/users.MYD' not found
(Errcode: 2) when using LOCK TABLES

The same error message appears each time you attempt to run mysqldump. In addition, the mysqldump halts every time it encounters the above error.

Cause:

The fundamental cause for the occurrence of the above error message is corruption of MySQL database. Few main reasons for MySQL database corruption are improper system shutdown, virus attack, and application malfunction.

Resolution:

To resolve the above error message, you will need to run the below command:

“mysqlcheck --all-databases --auto-repair -ucojjohealth -p”

While the above command repairs corrupted databases in most cases, there is a possibility of getting a new error message after this command:

“error: File '../diaendomet/users.MYD' not found (Errcode: 2)”

If you encounter the above error message, then your database has been corrupted badly. To repair your database in such situations, you will need to use third-party MySQL Database Recovery tools. MySQL Recovery utilities provide advanced, complete, and risk-free database repair applications that repair damaged MySQL database while maintaining the intactness of data. These tools employ high-end scanning mechanisms to comprehensively repair the corrupted MySQL databases. With to-the-point documentation, the tools serve as self-explanatory and repair-centric tools.

Thursday, March 18, 2010

Resolving “Database page corruption” Error in MySQL

MySQL database uses two storage engines- InnoDB and ISAM. InnoDB is the standard element of all current MySQL libraries. It supports several feature, which make it better than other storage engines. The features include foreign key support and storing data in primary key order. The InnoDB also features ACID properties- compliant transaction support, which allows it to recover from unforeseen crashes. In some situations, the InnoDB database may corrupt if you kill Mysqlid process, virus infection, improper system shutdown, application malfunction and many others. In such cases, you need to restore your database from most recent backup. If the backup is not available or up to date, you will require MySQL Repair solutions to retrieve data from damaged database.

In a practical scenario, you might come across below error message while trying to access data from an InnoDB database:

“Database page corruption on disk or a failed file read”

When this error message occurs, the MySQL application and database crashes down and renders all your critical data inaccessible. In order to gain access of your valuable data in such situations, you need to find out the cause of this behavior and go for MySQL Recovery by resolving it.

Root of the problem

As stated in the above error message, this problem occur due to corruption to the database pages or entire database. When database corruption occurs, MySQL can not read information from database and returns the error. However, other reasons of above problem can be improperly configured or damaged libraries.

Resolution

To sort out above problem, go through underwritten steps:

Check that all the linked libraries are correct and properly configured.
If the MySQL database is corrupted, use following steps to recover:
Analyze MySQL table corruption by this command:
Check Table tablename
Run following command to repair the damaged table:
Repair Table tablename
If the error message still occurs, repair and restore the damaged database using MySQL Repair software.

These are effective applications, which let you carry out absolute MySQL Database Recovery in most of the corruption scenarios. They are completely easy to use as they have interactive and simple graphical user interface. The software do not alter original contents of the database due to read-only behavior.

Database Recovery for MySQL is a powerful utility to handle all types of Repair MySQL Database corruption issues. It supports recovery from MySQL 5.x and 4.x. The software is compatible with Microsoft Windows Vista, 2003, XP and 2000 and all major Linux distributions.

Tuesday, March 16, 2010

How to Resolve “Record-file is crashed” Error in MySQL

MySQL database is made up of several tables, which store data in the form of rows and columns. A MySQL database table is the collection of several interrelated data records. The MySQL database tables are identified with different and unique names. You can easily and quickly identify table corruption when they produce incorrect result or retrieve irrelevant data.MySQL database corruption generally caused by improper system shutdown or application shutdown, application bug in MyISAM or MySQL code, user of third party application (such as myisamchk) on like table, virus infection, faulty memory and so forth. In these critical situations, if you do not have complete backup of your database, you are required to go for effective MySQL Repair using advanced tools.

In a practical scenario, where you use the Select statement to show all records of the Employee table. For this purpose you write below command:

Select * from employee;

When you execute this MySQL command, you come across below given error message and you does not get any record as output:

“Record-file is crashed”

The same problem might occur with any of the database table. Above error message indicates that the database table is damaged. Furthermore, you come across same error message and face same behavior every time when you run Select statement on MySQL table. Subsequent to the above error, all of the data stored in particular database table become inaccessible and you come across data loss situations. At this point, you are required to find out the cause of this problem and go for MySQL Recovery by resolving it.

Solution

In order to work around this issue and gain access of your mission critical data, first of all check the database table for corruption and integrity using underwritten command:

CHECK TABLE ;

After completion of this process, repair damaged database table using following command:
REPAIR TABLE
;
However, when the repair command can not fix the above issue, data may still remain inaccessible and you face same problem. In such cases, you should go for third party SQL Database Recovery software for assured and complete recovery.

These tools use high-end scanning techniques for in-depth scanning of affected database and retrieve all of its objects. These MySQL Repair applications have self-descriptive and interactive graphical user interface to offer ease of use. Due to read-only and non-destructive conduct, these tools are completely safe to use.

Stellar Phoenix Database Recovery for MySQL is the most trustworthy application to handle all cases of Repair MySQL database corruption. This tool supports both (MyISAM and InnoDB) MySQL database storage engines. It is designed to recover data from MySQL database installed on Windows Vista, 2003, XP, 2000 and Linux (all major distributions) operating systems.

Sunday, March 14, 2010

Table Crash Might Cause Database Corruption in MySQL

Each MySQL database is an organized group of table, which store data and information in form of rows and columns. Tables could be added or deleted as per your requirement. But in some situations, the database tables might get damaged and the stored data become inaccessible. Generally the MySQL tables are damaged due to improper system shutdown, using external application (such as myisamchk) on like table, insufficient disk space, virus infection, faulty memory and many alike. Corruption to database table cause serious data loss situations. In these cases, for absolute recovery, restore data from most recent backup. But if the backup is not available, you need to go for MySQL Repair solutions to get your critical data back.

In a practical scenario, when you try to access the MyISAM (account) table in MySQL database, you might come across below given error message and the process might get terminated:

“MySQL error: 145
Table './rootforu_forum/Accounts' is marked as crashed and should be repaired
Query: SELECT * FROM Accounts WHERE sid='73bc9dbecbab357dc2ca7a54fb410f09' AND ip='XX.XX.X.XXX' LIMIT 1”

The above error message indicates that corruption has occurred in the Accounts table of MyISAM database and thus you can not get into account.

Root of the problem

The major cause of this problem is corruption to the MyISAM table or entire database. The corruption could be due to insufficient memory space. In above scenario, the Accounts table needs to be repaired and restores for further accessing of the database.

Resolution

In order to sort out above issue and carry out MySQL Repair, check database corruption using below command:

“CHECK TABLE Accounts;
(If the Accounts table is stored on server, make sure that the server is currently running)
Next, repair Accounts table by using any of the following commands:

% mysqlcheck -uuser -ppass Accounts fixtures;
(When you run this command, make sure that the server is currently running)
Or
% myisamchk fixtures Accounts.MYI
(The server must be down and the Accounts table must be inactive when you run this command)

When all else fails to sort out your problem, go for MySQL Recovery using third party software. These software are particularly designed to effectively scan the damaged database and retrieve all of the data from it. The MySQL Recovery software are completely easy and safe to use.

Stellar Phoenix Database Recovery for MySQL is the most popular and widely used software to ensure perfect recovery. This read only application works well with MySQL 5.x and 4.x. This software is designed for Microsoft Windows Vista, 2003, XP, 2000 and Linux distributions.

Article Source :- http://articlenexus.com/Article/Table-Crash-Might-Cause-Database-Corruption-in-MySQL/271704

Thursday, March 11, 2010

MySQL Database Corruption Due to Damaged Table Handler


MySQL is a powerful and widely used Relational Database Management System (RDBMS), which provides multi-user access to different databases. This works on various operating system platforms including Microsoft Windows and Linux. The MySQL databases could involve several powerful feature such as triggers, stored procedures, cursors, query caching and views. In some situations, the reliable database gets damaged. In these cases, you are required to restore the database from backup to get your mission critical data back. In case if the backup is unavailable, it becomes essential to go for MySQL Recovery using proper tools.

In a practical scenario of MySQL database corruption, you might come across the below given error message when you attempt to access the database:

"Got error ### from table handler"

Where, ### refers to the MySQL error codes like 126, 127, 144, 145 etc.

After this behavior, the database could not be accessed and you come across data loss. At this point, you are required to find out the cause of this problem and go for MySQL Recovery by sorting it out.

Root of the issue

The above problem might take place because of the database corruption that might occur due to any of the below reasons:

Mysqld process has killed while writing data in the database. Hardware problems such as CPU and memory related. Improper system shutdown. Use of third party utilities for database operations. Software error in MyISAM or MySQL code. Resolution

In order to sort out this problem of MySQL Database, you need to go through below steps: Analyze the extent of database corruption. Use below command for the same: Check Table tablename If the database is damaged, you need to run the underwritten command for repairing it: Repair Table tablename

Scan whole database with the Check Table command again to verify if the database is free from corruption. If the problem persists, run mysqldump command to backup the database. Then create a new empty MySQL database and import the information from damaged database. After that, edit /admin/config.php point of newly created database. When all else fails, go for MySQL Database Recovery using third party tools.

These applications employ high-end scanning algorithms for efficient scanning of corrupted MySQL database and retrieve all of the data from it. They come equipped with interactive user interface and thus allows you to carry out easy and safe MySQL Repair.

Stellar Phoenix Database Recovery for MySQL is the absolute solution for all MySQL database corruption scenarios. It works well with MySQL 5.x and 4.x. This software recovers all MySQL database objects and compatible with Microsoft Windows Vista, XP, 2003 and 2000.

Article Source :- http://www.goarticles.com/cgi-bin/showa.cgi?C=1968809

Tuesday, March 9, 2010

Rectifying “Database page corruption” Error in MySQL


MySQL database use two different data storage engines and InnoDB is one among them. The InnoDB is a standard component of all the current MySQL libraries. It supports different features, which make is superior than other data storage engines. These storage engines are the foreign key support, for storing data rows in the primary key order. The InnoDB also features the ACID compliant transaction support, which enables the database to recover from unanticipated system crashes. Along with the unanticipated system crashes, the InnoDB database may also get damaged when you accidentally kill the Mysqlid process. In these circumstances, the database become inaccessible and you need to restore it from most recent backup. But in case if the backup is not available, you come across data loss situations and require MySQL Repair to sort them out.

In a practical scenario, while trying to access data from a InnoDB storage engine, you might encounter the below given error message:

"Database page corruption on disk or a failed file read"

When this error message occurs, the MySQL gets crashed down. This behavior of MySQL makes the database inaccessible. To gain access of your data in such situations, you are required to find out the cause of this issue and go for MySQL Recovery by sorting it out.

Root of the issue

As stated in the above error message, this behavior of InnoDB database occurs due to corruption. In case of corruption, MySQL can not recognize the data on hard drive and thus can not read it. Nevertheless the cause of this problem, ultimate result would be the loss of your valuable data.

Resolution

In order to sort out the above problem, try following methods:

Verify that all of the linked libraries are right and properly configured. Identify and resolve the hardware problems, if any. If the problem is due to database corruption, repair and restore it using MySQL Repair software.

These are powerful and advanced third party applications, which are capable of handling most of the InnoDB database corruption scenarios. These Repair MySQL Database applications use high-end scanning methods to ensure absolute and effective recovery. They have simple and interactive graphical user interface to let you carry out recovery, without demanding sound and prior technical skills. With read only conduct, these applications are quite safe to use.

Stellar Phoenix Database Recovery for MySQL is a powerful and effective repair software for corrupted MySQL databases. This software supports recovery for both MyISAM and InnoDB. This non-destructive application is compatible with Microsoft Windows Vista, 2003, XP, 2000 and Linux operating systems.

Article Source :- http://www.goarticles.com/cgi-bin/showa.cgi?C=1948123

Monday, March 8, 2010

Incorrect Key Files in Table Cause Corruption in MySQL Database

In MySQL database, the tables that are created by end user, that allows the users to store various kinds of data. These database tables are actually store all of your data and create the database. But in some cases, the database tables could get damaged due to interruption in mysqld (MySQL Server) procedures, virus infection, application bug, improper system shutdown, but in MySQL or MyISAM code and many alike. In these circumstances, the stored data become inaccessible and you come across data loss situations. In order to access data in these cases, you are required to go for data restoration from backup. In case if the restore process fails or you do not have backup, then you need to repair and restore the database using MySQL Recovery solutions.

In a practical scenario, when you try to open a MySQL database table, you might come across the below given error message and the table remains inaccessible:

"Incorrect key file for table: 'Users'. Try to repair it"

Subsequent to the above error message, the database queries don't find the rows in database table and thus you get incomplete results. Major reason behind the occurrence of the above error message is damage to the database table because of improper system shutdown.

Resolution

In order to sort out this problem and gain access of your valuable data, you need to repair and restore the damaged database tables. For this, you need to run the following command from MySQL prompt:

REPAIR TABLE ;

However, if you are not able to access MySQL prompt, then you need to access shell and then run myisamck tool. For checking the database table, you are required to run underwritten command on shell:

myisamchk /path/to/the/table

For repairing the table, write underwritten command on shell:

myisamchk -r /path/to/the/table

When all else fails, it becomes essential for you to go for third party applications to repair and restore the database. These applications are known MySQL Recovery software. They use efficient scanning algorithms to effectively scan the damaged database and retrieve all of the data from them.

These MySQL Repair applications do not demand sound and prior technical skills to repair the database as they have interactive user interface. The MySQL Database Recovery tools are complete safe to use with read only conduct.

Stellar Phoenix Database Recovery for MySQL is the most excellent solution for MySQL database corruption situations. This software supports recovery from InnoDB and MyISAM database engines of MySQL. It is compatible with Microsoft Windows Vista, 2003, XP and 2000 and on the Linux platform.

Article Source :- http://quizilla.teennick.com/stories/13932714/incorrect-key-files-in-table-cause-corruption-in-mysql-database

Friday, March 5, 2010

Heavy Load Might Corrupt InnoDB Database

Storing MySQL database with InnoDB storage engine gives enhancements of ACID-compliant transaction support and foreign key support, as compared to other storage engines. But database thus stored can also become corrupt and inaccessible due to several issues. Using MySQL Server in heavy load environment might corrupt the database. In such cases, it is recommended to dump the database tables if a valid backup is available. But if no clean backup is present, use powerful MySQL Recovery software to repair and restore the database.

Following is the example of a MySQL Server database stored using InnoDB storage engine that processes large amount of data and performs multiple tasks at a time:

A large database with thousands GB of data Multiple threads are running that write data to the server Several complex are running Multiple threads are running that query data from the server Different operations are performing to manipulate data from several tables

If you use a MySQL Server database in such an environment, the Server might crash and result into a corrupt database. You might observe that the InnoDB engine hangs when you to try to access the database.

Solution

If there are one or more database tables that are preventing the MySQL Server to start, you can dump those tables provided you have a valid backup available. To do so, follow these steps:

Before trying to start MySQL Server, add the following line to /etc/my.cnf configuration file:

[mysqld] innodb_force_recovery=4

This allows starting the server while preventing background operations.

Restart MySQL Server Dump all the database tables and shutdown the database You next need to delete the data dictionary and execute mysql_install_db in order to create the default tables that MySQL requires You should then remove the innodb_force_recovery line from the file Restore from backup

In case, no valid backup is available, you are suggested to use third-party MySQL Database Recovery tools. MySQL Recovery utilities are powerful, comprehensive and safe database repair applications that repair damaged MySQL database while maintaining the intactness of data.

Database Recovery For MySQL is an advanced and powerful MySQL Database Recovery utility that supports both MySQL database storage engines - MyISAM and InnoDB. It can completely repair and restore MySQL objects such as tables, primary key(s) and relations. It is compatible with Windows Vista, XP, 2003 and 2000. It supports MySQL 5.x. It also supports Windows based recovery from MySQL database installed on Linux platform.

Article Source :- http://www.goarticles.com/cgi-bin/showa.cgi?C=1931742

Thursday, March 4, 2010

Killing INSERT … SELECT Can Corrupt MySQL Table on MyISAM

The MySQL INSERT ... SELECT command allows you to insert several rows into a table from various tables. But at times, when you kill the command on MyISAM, you observe that the table gets corrupt. Such type of errors usually occur with large data sets. When you run CHECK TABLE command to check the table for consistency, it reports that the table is unusable as it is corrupt. The table thus corrupted should be restored from backup or you can alternatively use MySQL Repair tools that are competent products to allow safe repair of database and its objects.

To illustrate the same, consider that you use a table with name 'a' on MyISAM storage engine'. You execute INSERT ... SELECT command and kill it while it is running. After this, you use CHECK TABLE command to perform the sanity check of the table and come across errros similar to:

Table Op Msg_type Msg_text test.a check warning Table is marked as crashed and last repair failed test.a check warning Size of indexfile is: 1337344 Should be: 1024 test.a check error Record-count is not ok; is 92522 Should be: 0 test.a check warning Found 92522 key parts. Should be: 0 test.a check error Partition pMin returned error test.a check error Corrupt

Cause

The error indicates that the table has got corrupt. When you kill the INSERT ... SELECT statement, which is being applied on the table with indexes and contains large amount of data, it might get corrupt. This occurs when we disable the indexes for the purpose of fast insert. After the bulk_insert operation is completed, indexes are tried to be re-enabled. While MySQL is re-enabling the indexes, killing the query results into aborting the repair table operation and hence the table gets corrupt.

Solution

Use any of these methods to repair the corrupted MyISAM table:

You can use the following command to repair:

REPAIR TABLE table_name

Where, table_name is the name of corrupted table

Use MySQL Recovery tools for achieving best and safe repair results. MySQL Repair tools are fully-competent database recovery utilities built with powerful scanning technology and easy to use interface.

Stellar Phoenix Database Recovery For MySQL is the most powerful and advanced MySQL Recovery utility. It supports both Repair MySQL Database storage engines - MyISAM and InnoDB and is competent to completely repair and restore MySQL objects such as tables, primary key(s) and relations. It is compatible with Windows Vista, XP, 2003 and 2000. It supports MySQL 5.x. It also supports Windows based recovery from MySQL database installed on Linux platform.

Article Source :- http://www.goarticles.com/cgi-bin/showa.cgi?C=1909241

Wednesday, March 3, 2010

MySQL Fails to Start After Upgrading Fedora

MySQL is a multi-threaded and multi-user database server that allows implementing client/server architecture. It is consisted of different client libraries and programs and a server daemon called mysqld. MySQL can work on various system platforms including Linux. At times, you observe that after you upgrade the system, MySQL fails to start. It could occur if the database has become inconsistent due to errors while upgrading the system. In such situations, you need to use your backup or MySQL Repair tools to restore the corrupted database and its components.

For an instance, you are using MySQL on a Fedora Core 10 installed system. You upgrade the system to Fedora Core 11 and after this, when you attempt to start MySQL, it fails. Viewing the /var/log/mysql error log gives you errors such as:

"Fatal error: Can't open and lock privilege tables: Incorrect key file for table 'table_name; try to repair it"

The error log also describes to run mysql_upgrade and further errors such as:

"Incorrect key file for table 'table_name'; try to repair it"

As suggested, you cannot run mysql_upgrade as MySQL is failing to start.

Cause

One of the prominent reasons for such errors to occur is that MySQL tables have got corrupted due to version incompatibilities issues.

Solution

To reconcile the issue, you can try applying these methods of recovery:

If a clean database backup is available, use it to restore You need to run mysql_upgrade that is competent to check all database tables for incompatibility issues with the existing version of MySQL Server. After any error is found, the tool attempts to repair the table. You can also downgrade your MySQL installation to MySQL 5.0.67 and repair the table by running the below command:

REPAIR TABLE table_name

You can then upgrade MySQL to the current version. If above measures prove to be useless, you need to use MySQL Repair software. MySQL Recovery applications are competent products built with powerful database repair technology that restore corrupted database safely and provide interactive interface.

MySQL is a powerful Repair MySQL Database utility that supports both MySQL database storage engines - MyISAM and InnoDB. It can completely repair and restore MySQL objects such as tables, primary key(s) and relations. It is compatible with Windows Vista, XP, 2003 and 2000. It supports MySQL 5.x. It also supports Windows based recovery from MySQL database installed on Linux platform.

Tuesday, March 2, 2010

Resolving MySQL Error: 'Found wrong record at 0'

MySQL database tables can become inconsistent when a write operation to a data file doesn't accomplish successfully. This could occur due to several reasons like non-graceful shutdown of the server or power failure. Another reasons include application bugs, storage engine issues and more. The application provides myisamchk and mysqlcheck as two tools that can detect and repair such corruption errors in MySQL tables. If they fail to do so, you will require a valid backup to restore the lost information. However, if backup too fails to give the required results, you need to use MySQL Database Recovery application to repair the corrupted database.


For an instance, when you run myisamchk to check the consistency of a MySQL database table, it might report you errors as below:

“myisamchk: error: Found wrong record at 0
MyISAM-table 'table_name.MYI' is corrupted”

Where, table_name.MYI refers to the name of the table. MySQL uses .MYI files to use index information of the database table.

Cause

The above error is generally encountered when the .MYI file is inconsistent due to corruption.

Solution

To troubleshoot the database table corruption errors and to restore the information, you should apply these methods:

If you suspect that database table is corrupted, execute myisamchk command. Before running the command, you need to ensure that your MySQL server is not running. Follow this syntax to repair:

myisamchk --recover table_name.MYI

If the issue persists, try restoring from your backup. In order for backup to give complete results, it should exist in clean and completely updated state.
If none of the above measures help or is feasible, delete the damaged database table and create a new one.

To prevent data loss, you can alternatively repair your database using MySQL Recovery tools. Such MySQL Database Recovery utilies employ effective scanning algorithms to repair and restore the data stored in MyISAM tables. With exceptionally realistic user interface, this repair utility is easily usable without sound technical understanding. The repair tools should also set a secure link with MySQL Server while repairing the corrupted MyISAM table.

Stellar Phoenix Database Recovery for MySQL is the most used MySQL Repair software. This non-destructive repair utility is compatible with both (MyISAM and InnoDB) MySQL database storage engines. It can completely restore and Repair MySQL components like tables, primary key(s) and relations. It supports MySQL Recovery from MySQL database installed Windows (Vista, XP, 2003 and 2000) and on Linux platform.

Article Source :- http://www.articledashboard.com/Article/Resolving-MySQL-Error---Found-wrong-record-at-0-/1054308