COORDINATOR OF SERIAL FORCED PX

So I have lots and lots of parallel slaves available in one of my databases. However, Monday, one of the support guys came to me and said "this query used to take three hours, but now it takes more than 24 hours before having to kill him".

Unfortunately, the last time it was run was last month and I don't explain stats of plans/AWR going back that far, so can not see what he was doing.

However, when I look at, the request includes several PARALLELS, but reference tables valued DEGREE PARALLEL. It should be parallel. However, it is not.

When I see the plan to explain it, I see the following right at the top:

INSERT STATEMENT
LOAD SELECT AS
COUNTY STOPKEY
COORDINATOR OF SERIAL FORCED PX
PX SEND QC (RANDOM)
COUNTY STOPKEY
OUTER HASH JOIN
PX RECEIVE

Blah, blah, blah

What is the purpose of the FORCED SERIAL COORDINATOR PX? The stats of the objects look OK and last month, the thin application as expected. They were no changes in the structure of the underlying table. I suspect that it is forcing the query to run in series, which is at the origin of the performance problem.

We never saw it? It comes to 10.2.0.4

I found a few interesting article on this topic:

http://www.oaktable.NET/category/tags/PX-Coordinator-forced-serial

http://Oracle-Randolf.blogspot.com/2011/03/PX-Coordinator-forced-serial-operation.html

http://oracledoug.com/Serendipity/index.php?/archives/788-PX-issues-continued.html

You have all the user functions in your actual SQL? If so, this parallel has been activated?
A database logon trigger? If so, it changed in the last n days?

HTH - Mark D Powell.

PS - If spacial occurs then the next the RTO thread may be of interest
Parallel query of 'CONTAINS' and 'SERIAL FORCE' exec plan

Edited by: Mark D Powell on August 10, 2011 08:20

Tags: Database

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