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.