Php getting too many connections error from MySQL

Posted by uzioriluzan on Stack Overflow See other posts from Stack Overflow or by uzioriluzan
Published on 2010-05-24T08:55:11Z Indexed on 2010/05/24 9:01 UTC
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Hello everyone,

I am using MySQL and PHP with 2 application servers and 1 database server. With the increase of the number of users (around 1000 by now), I'm getting the following error :

SQLSTATE[08004] [1040] Too many connections

The parameter "max_connections" is set to "1000" in my.cnf and "mysql.max_persistent" is set to -1 in php.ini.

There are at most 1500 apache processes running at a time since the "MaxClients" apache parameter is equal to 750 and we have 2 application servers.

Should I raise the "max_connections" to 1500 as indicated in here?
Or should I set "mysql.max_persistent" to 750 (we use PDO with persistent connections for performance reasons since the database server is not the same as the application servers)?
Or should I try something else?

Thanks in advance!

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