NW65SP2 Server (Dual XEON 3.06GHZ w/ 5GB Ram)

This DB has been upgraded from ZFD4 to 6.5
It has always pegged processor (Both 4 and 6.5) while storing Full Scans
and now completely pegs the processor running inventory queries as well.

I noticed there is a procedure for reindexing on zfd4ir5.

I there something similar for 6.5 and if so what are the exact steps.

If not...What is the best way to blow away our exisitng Database and
start fresh. When the processor is pegged the server is virtually
groung to a hault