Analyze running twice as long after upgrade to 8.1.7.2

From: <Cherie_Machler_at_gelco.com>
Date: Mon, 10 Jun 2002 12:39:23 -0800
Message-ID: <F001.00479667.20020610123923@fatcity.com>

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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