Oracle 8.0.5, peoplesoft version 7.51

We have a report that has stopped working due to running out of temporary
space. 

The first step was to check the explain plan.  I compared the explain plans
between the 
production database and a dev database that is approx 6 months old.  They
were very different.  

Upon review we found that the production database is now using a different
index then the dev system.

I made a copy of the prod database, deleted the index, and the explain plan
and sql performed the
same as the dev system.  

Question I have is, what would cause the cost based optimizer to choose a
different index.  The only thing
that has changed is the number of rows in the source table.  

Statistics are up-todate, and I have re-built the indexes in question.

Thanks

Darren

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Darren Browett P.Eng                                            This message
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Data Administrator                                              using 100%
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Information and Communication Technology
City of Coquitlam 
P:(604)927 - 3614 
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