I currently run a Mysql forum on my dedicate server.
The forum is just like this forum.
My server has 1gb Ram.
Via the top command under the unix system, I found that the mysql always users lots of memory.
The usage of the Ram is always between 600-800mb.(At those time 100-200 people are online at sametime.)
I think this is not normal.

Could anyone can help me? and help me solve this problem?
Thank you!