I have had to reinstall MySQL, however the service is failing to start with the above cause listed in evnt viewer.

One solution is apparently to delete a couple of files prefixed with 'ib_logfile' which represent any old databases. However I do not have these files, and my service is still failing to start ... ? When I say I don't have these files I did a search using the windows search with zero results, and they are definitely not present in my mysql install directory. And I don't have the "documents and setting/appilcation data' folder referenced in link.

In fact I only have only one mysql install directory, I know where that is - what do I need to delete/change ? The instance is configured OK, I ran that as administrator and it is listed in services, but the service itself fails to start

Any tips, other than going over to postgresql ?


2 Answers 2


The linked solution helped me, I had to change the my.ini file in install directory, specifically this property to point at the correct location :

datadir="F:\MySQL\MySQL Server 5.5\data"

Which I got about 10 sec's after positing question, hey ho, will leave it up for others.

  • NimChimpsky u rockkkkk... correct solution. Keep it up. -Raj
    – user114773
    Mar 21, 2012 at 2:45
  • @Raj lol, thanks. You could just vote up though. Mar 21, 2012 at 7:38

I had the same issue and here's what I did to fix it:

  1. Delete the following files:
    • C:\ProgramData\MySQL\MySQL Server 5.5\data\ib_logfile0
    • C:\ProgramData\MySQL\MySQL Server 5.5\data\ib_logfile1
  2. Launch services.msc and start the MySQL55 service.

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