Re: Odd Parallelism Behavior (11.2.0.4) when DEGREE=DEFAULT and INSTANCES=DEFAULT
- From: Rich J <rjoralist3@xxxxxxxxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 15 Mar 2016 14:15:33 -0500
On 2016/03/15 13:05, Chris Taylor wrote:
"How to determine the Oracle default degree of parallelism - what
controls/influences the "default" degree?"
I thought it was default=1 but obviously that isn't true. Is there some way I
can find the calculated DEFAULT degree of parallelism that Oracle might be
using ?
I think
http://docs.oracle.com/cd/E11882_01/server.112/e41084/clauses006.htm#SQLRF20024
[1] holds the answer:
"If PARALLEL_DEGREE_POLICY is set to MANUAL, then the optimizer
calculates a degree of parallelism equal to the number of CPUs available
on all participating instances times the value of the
PARALLEL_THREADS_PER_CPU initialization parameter."
The other scenarios are found on that page as well.
HTH! GL!
Rich
Links:
------
[1]
http://docs.oracle.com/cd/E11882_01/server.112/e41084/clauses006.htm#SQLRF20024
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