Repairing corrupted mysql database

Sometimes it happens that your database get corrupted due to many reason like it does nto get restored properly or server get rebooted while updating database etc…. and you have tried to repait it using phpmyadmin and it does shows that it has repaired but it is not.

Solution :1

Login to server with root access

Stop mysql using following command

/etc/init.d/mysql stop

Run following command to check all the tables in the database

Run following command to check all the tables in teh database

/usr/bin/myisamchk /var/lib/mysql/databasename/*.MYI

Run following command to repair all the tables in the database

/usr/bin/myisamchk -r /var/lib/mysql/databasename/*.MYI

Then recheck again using following command

/usr/bin/myisamchk /var/lib/mysql/databasename/*.MYI

Restrart MySql service using following command

/etc/init.d/mysql restart

Solution : 2

If you want repair DB using myisamchk, you need to shutdown MySQL service before proceeding otherwise it will corrupt some other databases.

Alternatively, if you do not want to shut down MySQL, you can use mysqlcheck.

mysqlcheck [DBNAME]

To repair the database tables:

mysqlcheck -r [DBNAME]

also we can use the commands

mysqlcheck -u{username} -p{password}  –check –optimize –auto-repair –all-databases