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.

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