Different error messages that indicate database corruption in MySQL and how to fix them

Different error messages that indicate database corruption in MySQL and how to fix them

The MySQL database is the most used open database in the world as it is fairly reliable, secure, and fast enough to be considered as one of the best database for Web-based applications. Its use in some of the Web sites with most traffic such as Yahoo!, Alcatel Lucent, Flickr, etc is the best testimony one could get. Still, at times these MySQL databases get corrupt due to different issues such as virus infections, several users accessing and modifying the database at the same time, etc. You should use MySQL repair mechanisms to overcome such issues. In the event, it is not possible then you should use a third-party MySQL recovery software to resolve such issues.

When the MySQL table that you are using is corrupt, it may display abnormal symptoms and you would encounter different kinds of error messages. Some of them are:

tbl_name.frm is locked against change

Can't find file tbl_name.MYI (Errcode: nnn)

Unexpected end of file

Record file is crashed

Got error nnn from table handler

Cause:

These error messages indicate that the MyISAM table has damaged and, therefore, unable to function properly. The database corruption could have happened due to the reasons mentioned earlier in this article.

Resolution:

To overcome such database corruption problems, you can perform the following methods one after the another:

Using Check Table: You should use the Check Table command with appropriate parameters to check the validity of the table in question. For this, you can use the following syntax:

CHECK TABLE tbl_name [, tbl_name] ... [option] ...

option = {FOR UPGRADE | QUICK | FAST | MEDIUM | EXTENDED | CHANGED}

Using Repair Table: After detecting errors in the MyISAM table, you should repair the damaged table using the Repair Table command. For this, you can use the following syntax:

REPAIR [NO_WRITE_TO_BINLOG | LOCAL] TABLE

tbl_name [, tbl_name] ...

[QUICK] [EXTENDED] [USE_FRM]

Both of the MySQL in-built methods would be able to check and repair the integrity issues in the MyISAM table. However, if the issues are persisting then you would need to repair MySQL database using a third-party MySQL repair software. The best features of these read-only tools is risk-free database recovery using a rich user interface.

The most recommended MySQL recovery software that recovers data from MyISAM and InnoDB database engines is Stellar Phoenix Database Recovery for MySQL. With the ability to recover different kinds of MySQL files such as .myd, .frm, .ibdata, etc, this MySQL repair utility recovers tables, primary keys, views, etc. In addition, it is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

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