[vchkpw] Mysql Threads

[Mandy]

Hello,

I saw, that on the mailserver there are 10 Mysqltreads waiting for requests.
Everyone of the use 10MB RAM (standard installation of the rpms)
Is this nessesary, our would 2 threads be enought. If yes, where can i 
change this ?
Because 10 Threads --> 10 MB Ram --> 100MB RAM only for mysql ??

regards mandy.