Buy Percona ServicesBuy Now!

Handle Corrupted Tables

When a server subsystem tries to access a corrupted table, the server may crash. If this outcome is not desirable when a corrupted table is encountered, set the new system innodb_corrupt_table_action variable to a value which allows the ongoing operation to continue without crashing the server.

The server error log registers attempts to access corrupted table pages.

Interacting with the innodb_force_recovery variable

The innodb_corrupt_table_action variable may work in conjunction with the innodb_force_recovery variable which considerably reduces the effect of InnoDB subsystems running in the background.

If the innodb_force_recovery variable is set to a low value and you expect the server to crash, it may still be running due to a non-default value of the innodb_corrupt_table_action variable.

For more information about the innodb_force_recovery variable, see Forcing InnoDB Recovery from the MySQL Reference Manual.

This feature adds a new system variable.

Version Specific Information

  • 5.6.10-60.2: Feature ported from Percona Server 5.5

System Variables

variable innodb_corrupt_table_action
Version Info:
Command Line:

Yes

Config File:

Yes

Scope:

Global

Dynamic:

Yes

Variable Type:

ULONG

Range:

assert, warn, salvage

  • With the default value XtraDB will intentionally crash the server with an assertion failure as it would normally do when detecting corrupted data in a single-table tablespace.
  • If the warn value is used it will pass corruption of the table as corrupt table instead of crashing itself. For this to work innodb_file_per_table should be enabled. All file I/O for the datafile after detected as corrupt is disabled, except for the deletion.
  • When the option value is salvage, XtraDB allows read access to a corrupted tablespace, but ignores corrupted pages”.
Visit Percona Store


General Inquiries

For general inquiries, please send us your question and someone will contact you.