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I have a mysql server which is occasionly returns the ‘too many connections’ error. I have worked with the server admin to set the mysql and server vars up to the best. We reckon it’s down to a query which takes extremely long, then locks a table and thus backups others.
Was wondering what would be the best way to catch this problem?
If you’re able to get to a terminal when you start running into this issue, run:
SHOW PROCESSLIST;or
SHOW FULL PROCESSLIST;Look for any queries that are taking their sweet time to finish that may be locking your tables.
However, ‘too many connections’ can also be a result of rogue code that is not properly closing the connections it is opening (as Dominic pointed out above).