How To Repair Damaged/corrupted Myisam Tables?
MySQL is the most widely used RDBMS (Relations Database Management System)
, which uses MyISAM and InnoDB storage engines to store your valuable data. MyISAM is the standard storage engine for the MySQL databases. In some situations, MyISAM table gets damaged and all of its content become inaccessible. This behavior leads to critical data loss and you need to
Repair MySQL Database to get your valuable data back.
When you create a table under MySQL, three different files are created:
*.frm- It stores the format of MyISAM table.
*.MYD (MyData)- It stores the actual data.
*.MYI (MyIndex)- This table is used to store table index.
In an MyISAM table or its files gets damaged, you may come across a number of error messages, similar to the following ones:
Table 'attach_data' is marked as crashed and should be repaired
Or
Incorrect key file for table: . Try to repair it
This behavior of MyISAM table renders it inaccessible. In order to access the data from database table, you need to perform MySQL Recovery by repairing the damaged table.
How to Repair Corrupted MyISAM Table:
In order to repair and restore the damaged table and get all your valuable data back, go through the underwritten steps:
Identify the corrupted MyISAM tables through myisamchk utility. It gets information about the database tables/checks, repairs, and optimizes them. When you redirect output of the myisamchk tool to temporary file, only the damaged tables are displayed on screen.
Repair the damaged MyISAM table through myisamchk utility. Execute this command with -r option for repairing the damaged tables that are identified in earlier step.
Perform the check and repair in concert for whole MySQL database. This option makes the database consistent.
Allocate extra memory for the large sized MySQL database. The time of repair process depends upon the size of the database. To simplify and accelerate the process, increase system memory.
The above method works in most of the MyISAM table corruption scenarios and restore the data. However, it cannot handle severe table corruption and cannot retrieve the data. In such grave situations,
MySQL Repair software help you to restore data.
The applications Recover MySQL database in most of the corruption scenarios. They perform extensive scan of entire database through high-end scanning techniques. They are secure and easy to retrieve data.
MySQL is a powerful utility that provides assured recovery in all cases of corruption. It works well with MySQL 5.x and 4.x. The software recovers all database objects, such as tables, views, relations, triggers, and constraints, from both MyISAM and InnoDB storage engines.
by: Naveen Kadian
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