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06.16.2008 at 10:12AM PDT, ID: 23488893
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2.0

Analyze Table made performance worse!  -- help!

Asked by _TAD_ in Oracle 9.x, Oracle Database, Oracle 8.x

Tags: , ,

I ave a relatively large database that had some minor performance issues.  I had been going through and Analyzing tables and computing statistics.  This improved overall efficiency and the number of buffer gets went down dramatically.


That is, until I analyzed a table that was really out of wack.  The table stats claimed to have 400,000 rows, but a select count(*) showed about a million.  So I analyzed the table and computed statistics.  

When I did that, a query that was only using about 30 buffer gets per transaction now uses over 1,000 buffer gets for the same transaction.

The explain plan shows that the index is no longer being used.  Instead it is doing a full table scan.

What's up with that?  How do I fix it?
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[+][-]06.16.2008 at 10:29AM PDT, ID: 21795666

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[+][-]06.16.2008 at 10:54AM PDT, ID: 21795873

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[+][-]06.16.2008 at 11:32AM PDT, ID: 21796182

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[+][-]06.16.2008 at 12:04PM PDT, ID: 21796406

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[+][-]06.16.2008 at 12:33PM PDT, ID: 21796685

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[+][-]06.16.2008 at 01:32PM PDT, ID: 21797226

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[+][-]06.16.2008 at 01:48PM PDT, ID: 21797347

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About this solution

Zones: Oracle 9.x, Oracle Database, Oracle 8.x
Tags: Oracle, 9i, 9.2
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Solution Provided By: rbrooker
Participating Experts: 4
Solution Grade: C
 
 
[+][-]06.16.2008 at 01:59PM PDT, ID: 21797438

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[+][-]06.19.2008 at 10:08AM PDT, ID: 21824190

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[+][-]06.19.2008 at 02:29PM PDT, ID: 21826667

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[+][-]06.19.2008 at 03:47PM PDT, ID: 21827148

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