OVERHEAD and TRANSFERRATE are tablespace parameters that the optimizer uses to help choose an access plan. Are the defaults good enough? (hint: probably not) In this blog post, I describe a simple way to measure values for your system.
Want to know which MON_GET functions give you information about CPU usage? Can't remember how many input parameters there are to MON_GET_BUFFERPOOL? The Information Center can tell you - but here's a much faster way!