Shantanu's Blog

Corporate Consultant

March 06, 2013

 

InnoDB force recovery

If I did not shut down the mysql service at the time of stopping the server. Next time I got the following message in the mysql error log file (mysqld.log or /var/log/syslog).

[Note] Plugin 'FEDERATED' is disabled.
InnoDB: The InnoDB memory heap is disabled
InnoDB: Mutexes and rw_locks use GCC atomic builtins
InnoDB: Compressed tables use zlib 1.2.3.4
InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: Completed initialization of buffer pool
InnoDB: highest supported file format is Barracuda.
The log sequence number in ibdata files does not match
the log sequence number in the ib_logfiles!
InnoDB: Database was not shut down normally!
Starting crash recovery.
Reading tablespace information from the .ibd files...
InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name .
InnoDB: File operation call: 'opendir'.
InnoDB: Cannot continue operation.


The fix was easy in this case. Just adding the following line in [mysqld] section of my.cnf file.

innodb_force_recovery = 6

* InnoDB is started in read only mode preventing users from performing INSERT, UPDATE, or DELETE operations.
* You can SELECT from tables to dump them, or DROP or CREATE tables even if forced recovery is used.
* If you know that a given table is causing a crash on rollback, you can drop it.
* You can also use this to stop a runaway rollback caused by a failing mass import or ALTER TABLE.
* You can kill the mysqld process and set innodb_force_recovery to 3 to bring the database up without the rollback.

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