Question

Hi mistakenly I have deleted my MySQL database from Windos XP based PC (this database was used to host a Wiki service using Xampp package). Now I am trying to restore the data so that I can atleast retrieve the TEXT entered in the respective table of Mediawiki package.

After deletion I tried to recover the data using Minitool data recovery software and was able to recover the main schema folder containing .frm files, ib_logfile0, ib_logfile1 and ibdata1 (which was stored under C>xampp>mysql>data).

Now I am trying to restore the database so that I can take a SQL dump and use it accordingly. I have consulted some previous suggestions provided by the experts. Below are the links –

Restoring MySQL InnoDB files on Windows

Stackoverflow answers

But these did not help me very much, not sure what exactly I am missing from the instructions. At the end I was unable to start MySQL service and it failed with the below errors in log –

120823 12:17:04 [Note] Plugin 'FEDERATED' is disabled.
120823 12:17:04 InnoDB: The InnoDB memory heap is disabled
120823 12:17:04 InnoDB: Mutexes and rw_locks use Windows interlocked functions
120823 12:17:04 InnoDB: Compressed tables use zlib 1.2.3
120823 12:17:04 InnoDB: Initializing buffer pool, size = 16.0M
120823 12:17:04 InnoDB: Completed initialization of buffer pool
120823 12:17:04 InnoDB: highest supported file format is Barracuda.
InnoDB: No valid checkpoint found.
InnoDB: If this error appears when you are creating an InnoDB database,
InnoDB: the problem may be that during an earlier attempt you managed
InnoDB: to create the InnoDB data files, but log file creation failed.
InnoDB: If that is the case, please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.5/en/error-creating-innodb.html
120823 12:17:04 [ERROR] Plugin 'InnoDB' init function returned error.
120823 12:17:04 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
120823 12:17:04 [ERROR] Unknown/unsupported storage engine: InnoDB
120823 12:17:04 [ERROR] Aborting

Any help to recover from this situation will be highly appreciated. I am willing to provide some more data if required. [MySQL Server Version 5.5, xampp-win32-1.8.0-VC9]

Answer 1

Oh God finally it’s solved 🙂
Actually I am a novice that’s why I could not solve this quickly. Here is the workflow I followed.

• I installed a fresh copy of MySQL server. Run Wizard config for transactional database.
• I stopped MySQL from Services.msc
• Then overwrote the ib* and *frm files (under the schema folder) in C/programdata/mysql/mysql server 5.5/data folder
• Updated the my.ini in C/apps/mysql with the innodb_log_file_size=<actual size of iblogfile0>
• ran the command mysqld --defaults-file="C:/apps/mysql/my.ini" --standalone --console --innodb_force_recovery=6
• once the above completed closed cmd.exe
• restarted MySQL service
• Opened MySQL workbench and took a dump

Sorry to confuse you all. Thanks again. Let me know if anybody requires any clarity for the above steps.