Jack,
Thanks for this insight. I'll check this out.
We did not change our sort_area_size. However, I suspect there have been
changes in the default method that Oracle is using sort_area_size.
Perhaps I need to increase sort_area_size? I have a test database I can
try it out on and see.
Thanks,
Cherie
Jack Silvey
<jack_silvey@y To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
ahoo.com> cc:
Sent by: Subject: RE: Analyze running twice as
long after upgrade to 8.1.7.2
[EMAIL PROTECTED]
om
06/10/02 10:13
PM
Please respond
to ORACLE-L
Just a thought, since analyze does sorting, might be a
change in sort_area_size. Did you change this param
when you upgraded? Try it with a large sort_area and
see what happens.
jack silvey
--- [EMAIL PROTECTED] wrote:
> I suggest running in parallel. Also, is the table
> partitioned?
>
> -----Original Message-----
> Sent: Monday, June 10, 2002 4:39 PM
> To: Multiple recipients of list ORACLE-L
>
>
>
> We just upgraded our data warehouse from version
> 8.0.4 to version 8.1.7.2
> of Oracle. We run on Sun Solaris 2.6 vith Veritas
> Quick I/O.
>
> We do an analyze compute nightly with a 10% estimate
> of our large, main
> fact table. Before the upgrade, the analyze ran
> for 45 minutes. Since
> the upgrade, it's run three times at a consistent 90
> minutes.
>
> I am trying to research on Metalink but have not had
> much success. Why
> would this analyze suddenly run longer? I wouldn't
> think that analyze
> code is being modified much in new releases. All
> the effort would go into
> new packages like DBMS_STATS. Is anyone aware of
> analyze changing in 8i.
>
> Our analyze was of a partitioned table and was
> single-threaded, not
> parallel. I can see that it is still
> single-threaded.
>
> We really didn't change much during the upgrade. I
> added another datafile
> to the SYSTEM tablespace (on the same file system as
> the previous file).
>
> I also changed parallel_threads_per_cpu from 2 to 0.
> However, since we
> never did the analyze in parallel, I don't think it
> was an issue.
>
> Any other ideas? I'd like to be able to give our
> application owners some
> explanation.
>
> Thanks,
>
> Cherie
>
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