Re: An ancient mystery
- From: Daniel Fink <daniel.fink@xxxxxxxxxxxxxx>
- To: oracledba.williams@xxxxxxxxx
- Date: Thu, 20 Nov 2008 20:26:09 -0700
Was there a data load occurring that would have invalidated the index?
--
Daniel Fink
OptimalDBA.com - Oracle Performance, Diagnosis, Data Recovery and Training
OptimalDBA http://www.optimaldba.com
Oracle Blog http://optimaldba.blogspot.com
Lost Data? http://www.ora600.be/
Dennis Williams wrote:
List,
The situation:
Oracle 8.1.7.4 <http://8.1.7.4> database on Solaris 8 (soon to be
upgraded to 10g)
Rule-based Optimizer
A query which has run for years using an indexed access to a very
large table (maybe 100 million rows)
suddenly decides to use a full-table scan, shutting down a critical
business process.
Then after several hours, it switches back to using the index.
All concerned claim that nothing changed before or after.
Needless to say the business users are nervous. They think maybe the
database grew beyond some limit.
Can anyone think of an explanation?
Thanks,
Dennis Williams
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