Innodb Tables Locked Post Mysql Database Damage

MySQL database corruption can result in fatal consequences

, leading to inaccessibility of records saved in database components, like tables. Few most common reasons for corruption could be improper shutdown of the system/MySQLD, concurrent modification of InnoDB tables, and virus infection. To access records saved in database components post MySQL database corruption, you need to restore database from an updated backup. However, if no database backup is available or backup falls short of restoring the database, then you will need to opt for an effective third-party Repair MySQL Database application.

To illustrate the above issue, consider, you create a MySQL database with five InnoDB tables. The database gets corrupted due to improper system shutdown of MySQLD. When you try to open a InnoDB table using the below command, it does not open:

mysql> select count(*),date from Employee where date > 20090216 group by date order by date;

In addition, other database tables also get locked after MySQL database corruption. The records saved in the tables become inaccessible after they get locked.

Cause:

MySQL database corruption locks the tables.

Resolution:

To unlock the InnoDB tables and to repair corrupted MySQL database, you will need to:

Take an updated backup of the database and perform restoration at a safe place.

Repair InnoDB database using 'innodb_force_recovery = 4' command, in the absence of a valid backup or backup file corruption. This command completely repairs the databases in most logical damage scenarios. However, there are certain situations in which, this inbuilt repair command fails to repair the database. For such cases, you need to use an advanced third-party MySQL Database Repair application.

A MySQL Repair utility provides maximum repair of corrupt tables and restores them at user-specified destination. The tool is built with interactive user-interface that makes it easy to operate. The repair software does not makes any modification to the original table, making the repair process absolutely safe and secure.

Stellar Phoenix Database Recovery For MySQL is a powerful MySQL Repair utility that repairs corrupt InnoDB database as well as MyISAM databases. Supported by both Windows and Linux operating systems, the read only tool is compatible with MySQL 5.x and 4.x. It requires no technical understanding to operate this software.

by: Naveen Kadian

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