Myisam repair

For the other errors, you must repair your tables. The repair process involves up to four stages, described here. Before you begin, you should change location to the database directory and check the permissions of the table files.

This command helps remove incorrect rows and deleted rows from the data file and reconstructs the index file. If you found that the above step fails, then use safe recovery mode – myisamchk –safe-recover tbl_name. Do you have an inaccessible, damaged or deleted database? You can safely restore it with MySQL Recovery ! For general myisamchk backgroun see Section 4. Other table-repair information can be found at Section 2. Rebuilding or Repairing Tables or Indexes”. Increasing from the default will usually result in faster repair , but will use more CPU and memory.

The value is given in bytes. MyISAM Table-Maintenance Utility”. Set the size of the buffer used when recovering tables.

Automatic recovery is activated if you start mysqld with the myisam _recover_options system variable set. Alternatively, save the tables in. If you want a repair operation to go much faster, you should set the values of the sort_buffer_size and key_buffer_size variables each to about of your available memory when running myisamchk.

If you get unexpected errors when repairing (such as out of memory errors), or if myisamchk crashes, go to Stage 3. With MySQL Recovery, you can open multiple databases at the same time without long loading times. MySQL data recovery software as a repair tool. This supports three different storage format.

Identify all corrupted tables using myisamchk. When you redirect the output of myisamchk to a temporary file, it will. Repair the corrupted table using myisamchk. Execute the myisamchk as shown below, with -r option to repair the.

If you cannot free up or add any disk space, you could copy the table_data. MYMYI,frm,etc) to another machine with plenty of free disk, run the repair there with myisamchk, then copy the files back to the original machine. Do a repair operation automatically if myisamchk finds any errors in the table. Print informational statistics about the table that is checked.

REPAIR TABLE Statement can help you in recovering the table. G, I doubt that the thereotical max size of the indices will be anywhere close to that. If the server needs to stay running, do a FLUSH TABLES WITH READ LOCK table_data before copying the data to the other server and UNLOCK TABLES after you copy the data back. The MySQL repair tool can help to fix data and SQL objects and scripts from incorrect databases.

This would require full repair or rebuilds of the indexes and tables.