How to clean the database ?

[fifi]

I give a hand to a forum. I just realize that all the erased messages from the forum are still in the database, all the query are still present. I can't find how to clean up all the database and when I want to make a backup I got the message of MySql out of memory.

Thank's a lot in advance.

[Robulosity2]

If your running out of memory during mySql queries than you either need to

1) Increase the memory allocation given
2) Simplify the queries

Beyond that see below

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