Axapta and Oracle Parallel Query Execution

Hi! We are using Axapta 3.0SP3 on an Oracle The DB server is a dual Xeon 3.2 Ghz (so I see 4 CPU threads in task manager). Now, from time to time one of the CPU threads goes up to almost 100% and the others are still at 1-2 %. So it seems to me that Oracle does not spread it’s CPU load to more CPU’s (at least for one process). I have found that on Oracle, you have to activate the “Parallel” option on each table. Question now: has anybody of you made that? Is it advisable to activate it when using Axapta? Any thoughts on it?