Mysql on XAMPP server wont start.

Nadishan Published at Dev

Nadishan

I'm trying to start mysql server but it gives following error log. I tried to change port number. But it is no worth

2014-09-26 09:31:23 3880 [Note] Plugin 'FEDERATED' is disabled.
2014-09-26 09:31:23 f34 InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB's internal memory allocator.
2014-09-26 09:31:23 3880 [Note] InnoDB: Using atomics to ref count buffer pool pages
2014-09-26 09:31:23 3880 [Note] InnoDB: The InnoDB memory heap is disabled
2014-09-26 09:31:23 3880 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2014-09-26 09:31:23 3880 [Note] InnoDB: Compressed tables use zlib 1.2.3
2014-09-26 09:31:23 3880 [Note] InnoDB: Not using CPU crc32 instructions
2014-09-26 09:31:23 3880 [Note] InnoDB: Initializing buffer pool, size = 16.0M
2014-09-26 09:31:23 3880 [Note] InnoDB: Completed initialization of buffer pool
2014-09-26 09:31:23 3880 [Note] InnoDB: Highest supported file format is Barracuda.
2014-09-26 09:31:23 3880 [Note] InnoDB: Log scan progressed past the checkpoint lsn 3997169
2014-09-26 09:31:23 3880 [Note] InnoDB: Database was not shutdown normally!
2014-09-26 09:31:23 3880 [Note] InnoDB: Starting crash recovery.
2014-09-26 09:31:23 3880 [Note] InnoDB: Reading tablespace information from the .ibd files...
2014-09-26 09:31:24 3880 [Note] InnoDB: Restoring possible half-written data pages 
2014-09-26 09:31:24 3880 [Note] InnoDB: from the doublewrite buffer...
InnoDB: Doing recovery: scanned up to log sequence number 3997285
2014-09-26 09:31:24 3880 [Note] InnoDB: 128 rollback segment(s) are active.
2014-09-26 09:31:25 3880 [Note] InnoDB: Waiting for purge to start
2014-09-26 09:31:25 3880 [Note] InnoDB: 5.6.16 started; log sequence number 3997285
2014-09-26 09:31:25 3880 [Note] Server hostname (bind-address): '*'; port: 3306
2014-09-26 09:31:25 3880 [Note] IPv6 is available.
2014-09-26 09:31:25 3880 [Note]   - '::' resolves to '::';
2014-09-26 09:31:25 3880 [Note] Server socket created on IP: '::'.
2014-09-26 09:31:25 3880 [ERROR] Fatal error: Can't open and lock privilege tables: Incorrect file format 'user'

Bjoern

The real problem is shown here:

2014-09-26 09:31:25 3880 [ERROR] Fatal error: Can't open and lock privilege tables: Incorrect file format 'user'

At least one of the table files in C:\your\xampp\mysql\data\mysql\user* seems to be defect. Since this is vital for the server, therefore it can't start.

Possible ways to deal with this:

If you have the issue right after installation, try a re-install.
If you have the issue only recently, restore C:\your\xampp\mysql\data\mysql\user* from a recent backup.
If you have no backup, you might even install another mysql instance somewhere else and copy the files C:\your\new\mysql\data\mysql\user* into C:\your\xampp\mysql\data\mysql\. Since this will only contain the default users, you'll have to manually add users you've worked with in your old, corrupt installation.

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