How to know the optimal Degree of Parallelism for my database?

I have an important application on my databae (Oracle 10,2,0) and the box has 4 CPU. All the tables are not partitioned. Should I set the parallel degree by myself?
How to know the optimal Degree of Parallelism for my database?

As far as I am concerned there is no optimal degree of parallism at the database level. The optimal value varies by query based on the plan in use. It may change over time.
It is not that difficult to overuse the PQO and end up harming overall database performance. PQO is a brute force methology and should be applied carefully. Otherwise you end up with inconsisten results.
You can let Oracle manage it, or you can manage it on the statement level via hints. I do not like specifying degrees of parallelism at the object level. As I said, no two queries are exactly alike and what is right for one query against a table may not be right for another query against the table.
If in doubt set up the system to let Oracle manage it. if what you are really asking is how many PQO sessions to allocate then look at your Statspack or AWR reports and judge your system load. Monitor v$px_session and v$pq_slave to see how much activity these views show.
IMHO -- Mark D Powell --

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