I see several deadlock errors on IPB's SQL error log. Example:

Date: Wed, 29 Jan 2014 20:09:35 +0000

Error: 1213 - Deadlock found when trying to get lock; try restarting transaction

IP Address: 108.162.212.90 - /topic/527921-como-abrir-arquivos-xls/

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mySQL query error: DELETE FROM skin_cache WHERE cache_type='css' AND cache_set_id=1 AND cache_value_1='ipb_mlist'

Table skin_cache is already InnoDB.

I don't know how serious this issue is, if I should worry about it, and if there is anything I could do.

We run a MySQL 5.6.16 dedicated server with 32 GB of RAM, which is more than enough for our current needs.

Have you tried to tune your MySQL settings ? The defaults settings are not good enough for an heavy community.

You get a deadlock when two transactions are trying to lock two locks at opposite orders.

connection 1: locks key(1), locks key(2);

connection 2: locks key(2), locks key(1);

You should check your queries and fix them but it is a complex task if that's your case.

This topic was from 2 years ago... 

@RevengeFNF realised it afterwards...