Assertion Failure Errors in InnoDB Tables

InnoDB is a standard MySQL storage engine that supports advanced features like support to ACID (Atomicity, Consistency, Isolation and Durability) compliant transactions and foreign keys. InnoDB databases if exposed to unexpected shutdown or crashes, can recover by replaying its logs. These features help increasing concurrency and performance of these databases. But database corruption is not an exception with this storage engine. InnoDB databases are prone to corruption due to ailments like power failure, kernel bugs, MySQL error faults and other similar causes. If no valid database backup is available, you will need to use MySQL Database Recovery products to recover from such situations. These utilities perform effective database repair.

Consider an instance, you try to access MySQL database table stored on InnoDB storage engine and it crashes. After this, when you view the crash log report, it gives you the similar error messages:

“InnoDB: Assertion failure in thread in file line “

InnoDB tables are created in a tablespace. The above error message further describes that if you get repeated assertion failures and crashes, the InnoDB tablespace might be corrupted.

Cause

You might similar errors, as above, if one of the below conditions is true:

One or more libraries, against which the database is linked, are damaged, misconfigured or incorrectly built

Hardware faults

Table is damaged

Solution

Try troubleshooting the above behavior by following these steps:

Make sure that all the libraries are properly configured. Reinstall them, if required

Diagnose the system for possible hardware issues. Refer to system, application and MySQL error logs for corresponding hardware issues related entries

To repair database table, use these steps in order:

Execute CHECK TABLE command to check the table for corruption errors:

CHECK TABLE tablename

If the above check gives corruption results, you need to repair the damaged table:

REPAIR TABLE tablename

If applying the above measures doesn’t help, you should restore from backup.

If no clean backup is available, use MySQL Recovery utilities. MySQL Database Recovery tools scan corrupted database and repair it by providing graphically rich user interface.

Stellar Phoenix Database Recovery For MySQL is a comprehensive utility that repairs and restores damaged MySQL databases. It repairs files created with InnoDB (.ibdata, .ibd and .frm) and MyISAM (.myd, .myi and .frm) database storage engines. It is read-only tool that supports MySQL 5.x. This MySQL Recovery is compatible with Windows Vista, XP, 2003, and 2000. It can repair databases created with both Windows and Linux platforms.

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Linux recovery solution for managing the problems of the system file corruption

In the Linux system, the "mount" command is used to activate the partition. Even with the "mount" command to enable is the Linux operating system to take advantage of the data and information from specific partition, are accessed. But sometimes, the command to the partition and after which all data in this particular device to be mounted completely inaccessible. The cause may be a possible case of corruption in the file system of Linux and you can use any recovery software for LinuxRetrieve the data again.
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