Wednesday, March 31, 2010

Repairing corrupt MySQL tables

MySQL table corruption can be easily identified. Few symptoms that allow you to identify table corruption are - queries stop fetching records, display of an error message, and display of incorrect records. The above symptoms primarily results in inaccessibility of records stored in MySQL tables. In such situations, a complete database backup allows you to overcome the problem by restoring all the required data. However, there is a possibility that the data backup is corrupted or does not restore the required information. For absolute repair of corrupted tables under such situations, you will need to opt for advanced MySQL Repair software.

Consider a practical example, where you encounter the below error message when you attempt to access the records saved in Employee table:

"Unexpected end of File"

The above error message makes the data stored in the Employee database records inaccessible. In addition, the same error message re-appears each time you attempt to access the records saved in the Employee table.


The root cause for the occurrence of the above error message is the corruption of Employee table. Few main reasons for table corruption can be unexpected system shut down, improper locking of tables, header corruption, virus attack, and human errors.


To resolve the above error and access the records saved in Employee table, you will need to follow the below measures:

Check the Employee table for the extent of corruption using the below command: CHECK TABLE Employee

If the above command reports corruption, then you will need to repair the table by using the below command:


In most cases, table corruption gets resolved by using the above command. However, if the problem persists and the same error message appears again while accessing the records, then you will need to use advanced MySQL Database Repair software. Such read only MySQL Recovery utilities employ powerful procedures to to systematically scan and repair the corrupted tables. These repair tools are built with highly interactive user-interface and can be used by both technical and non-technical users.


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