Is there a guideline for having # of Parallels?
Hi.
I'm trying to speed up the PL/SQL proc with
ALTER TABLE A PARALLEL 10;
ALTER SESSION ENABLE PARALLEL DML;
Question - I tried changing 10 to 30, but the Enterprise Mgr shows longer estimates...is there a way to gauge how many sessions should be used?
Thanks,
As far as I know setting the degree of parallelism for a table is a bit of trial and error. Its limited by the number of parallel query servers available; you can find the number available from the V$PARAMETER view. Its also dependent on the number of processors your box has.
By the way, parallelism is not the answer to every problem. I've seen it help in situations involving partitioning, full table scans, and sorting. I've also seen it do nothing and sometimes make queries run more slowly. Try using the parallel hint in the queries you expect it to be use specifying the degree before altering the table.
Good luck!
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