Memory Use

[Ben Clewett]

Dear MySql,

Using: 5.1.11 on AIX (precompiled 64-bit) with 100% InnoDB, 4GB memory.

Our MySql is consistently using 150% memory, or 50% paging space.  Once 
it gets to 150%, it tends to stay at this limit consistently.

I am trying to find a tool to tell me what it is using, and some 
documentation about how to control MySQL memory use.

Would some kind member help me find these?

Regards,

Ben Clewett.