In MySQL databases, an index refers to the copy of one part of a table. Because of indexes when you perform an operation on tables, you get fast results. You can create these indexes on one or more table columns. But at times, these indexes get corrupt due to software or hardware faults. Such issues make the critical information stored in the MySQL database inaccessible. In such cases, you need to repair the MySQL database table. However, if the repair attempt fails and you dont have a valid data backup, you need to use powerful MySQL Repair utilities.
You might encounter the below error message with your MySQL database:
126: Index file is crashed / Wrong file format
After the occurrence of this error message, you face issues while accessing the table.
Cause
The above error message gets encountered due to the corruption of index file. As a result of which, when you attempt to run any query, it aborts unexpectedly as it cant find the path to proceed. Index corruption can occur due to improper table locking, unexpected shutdown, application errors and other similar reasons.
Solution
To solve this issue, you need to follow these steps in sequence:
First, you need to check MySQL table corruption. You can use CHECK TABLE statement , mysqlcheck command-line utility or myisamchk command-line utility. The latter two utilities can only be used with MyISAM tables and not with InnoDB tables. The basic syntax of these commands is as follows:
CHECK TABLE tablename
mysqlcheck dbname tablename
myisamchk dbname tablename
You can use appropriate options with them.
If you experience errors related to table corruption, you need to repair the affected table. To accomplish the same, you can use REPAIR TABLE command as below:
REPAIR TABLE tablename
You can also use mysqlcheck or myisamchk command-line utilities, but only for MyISAM tables.
If you continue to receive the same error messages, repair is beyond the scope of above utilities. Thus, you need to use an updated data backup to restore the complete database. But if no backup is available or the present backup is not valid to restore the lost data, you need to repair the damaged database with
MySQL Database Recovery applications. These are special tools that use powerful scanning algorithms to safely repair and restore MySQL database components.
Stellar Phoenix Database Recovery For MySQL is the premier MySQL Repair tool that can instantly repair and restore corrupt MySQL databases. It supports both InnoDB (.ibdata, .ibd and .frm) and MyISAM (.myd, .myi and .frm) files. The software is compatible with MySQL 5.x. This
MySQL Recovery software supports recovery from MySQL database installed on Windows as well as Linux platforms. It is compatible with Windows Vista, XP, 2003 and 2000.
