A few weeks ago we had a power outage on one of our web servers that hosts several websites, we didn't think it affected anything and everything came back up as normal as far as we were aware. I have been analysing the logs over the past few days to try and optimise as I noticed increased load recently - after exploring the mysql .err file I can see continual loading error messages such as the following -

Cannot find or open table example_example/table1 from the internal data dictionary of InnoDB though the .frm file for the table exists. Maybe you have deleted and recreated InnoDB data files but have forgotten to delete the corresponding .frm files of InnoDB tables, or you have moved .frm files to another database? or, the table contains indexes that this version of the engine doesn't support. See http://dev.mysql.com/doc/refman/5.5/en/innodb-troubleshooting.html how you can resolve the problem.

We have tried the suggested link on MySQL but doesn't seem to be working.

We do not have backup of the databases from a couple of weeks ago, so not quite sure how to diagnose or resolve this but have come to a brick wall.

Any advice would be greatly appreciated.

  • 1
    One takeaway from this would be to ensure you retain backups after any "incident", purely on the assumption you might have undetected corruption.
    – Hannah Vernon
    Jul 8, 2014 at 22:20
  • Thanks - lesson certainly learnt. We usually retain backups for up to 21 days after but this went undetected for a little longer.
    – James
    Jul 8, 2014 at 23:03

1 Answer 1


The InnoDB dictionary contains information about all tables in your database(s). The dictionary is a set of InnoDB tables hidden from a user.

Looks like a records about example_example/table1 is missing in the dictionary.

I'd explore content of SYS_INDEXES and SYS_TABLES to see if the table is in it. https://twindb.com/how-to-recover-innodb-dictionary/

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.