Tuesday, December 13, 2011

Repercussions of InnoDB table corruption and MySQL database recovery

MySQL incorporates a blend of advanced features to offer users a performance-driven and a fully-integrated transaction-safe database. It has excellent capabilities to enable you manage any large database environment. You can use the Query Analyzer to keep a check on query performance and identify the faulty SQL code that is causing a slowdown. Some of its most distinguished features include, crash recovery, roll back, full commit, and row-level locking capabilities. Despite being so much reliable and consistent, this database is prone to corruption. MySQL corruption generally occurs due to improper server shutdown, operating system malfunction, metadata structure damage, etc. As a consequence, all vital database objects become inaccessible. To overcome this problem, you need to go for MySQL database recovery through a proficient third-party utility.

For instance, while upgrading your MySQL server that is running on InnoDB engine, you may come across the following error message:

“#1033 - Incorrect information in file 'file_name”

Cause: Due to power surge or other reasons, the upgrade could not be completed successfully. As a consequence, some of the InnoDB tables became corrupt.

This could make all the database tables inaccessible and might result in critical data loss. You can easily restore your database by using a recent/updated backup. If the backup is not available, you should follow the below mentioned resolution steps.

Resolution: The following steps may help you resolve the issue-
  • The 'Check table' utility may help you identify corruption and at the same time, repair the structure of damaged InnoDB tables.
  • Restart MySQL server using innodb_force_recovery=4 command.
If the problem still persists, take help of an efficient MySQL repair tool. These third-party software perform an extensive scan of the corrupt MySQL databases to repair and restore all database objects while retaining their original structure and properties. They have an interactive and self-descriptive interface that makes recovery easy and convenient for the end user. They effectively recover tables, keys, constraints, queries, data types, etc.

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