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Re: Lost connection to MySQL server during query
Posted by: Peter Brawley
Date: November 14, 2017 11:25AM

If the simple queries I suggested crash MySQL, it's effectively unusable.

A thousand error log entries like ...

> InnoDB: Database page corruption on disk or a failed
> InnoDB: file read of page 1.
> InnoDB: You may have to recover from a backup.

... confirm that you system is not just unusable, the problems are creating more corruption the longer it runs. You have an emergency.

1, run free -m and post the result here (your system is very likely doing a lot of swapping).

2, stop all apps that are issuing queries.

3, run the diagnostic queries I suggested, post the results here.

4. Run Check Table on all tables, drop and re-use indexes for tables where Check Table reports ok, try to fix the bad tables (
) or restore them from backups. While you are doing that, I'll run analysis on your diagnostic results and post the results.

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Re: Lost connection to MySQL server during query
November 14, 2017 11:25AM

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