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I have a select with excessive db block gets

edited Feb 9, 2015 10:03AM in SQL Performance (MOSC) 5 commentsAnswered

Hi,

I have a query that runs in production and BI systems. Production is 11g RAC Bi is 10g single instance.

This ran in BI in 1.5 hrs and was slower in production...some 8 hrs.

The data sets are 170 k rows and the stats are similar. After tuning the BI query reduced to 5.6 seconds... great.

However even after copying the profile from 10 to 11 ...making sure they are the same plan the query in 11g production

went out to 12 hrs. Quite a difference.

Thinking it could be read consistencey problems I built a clone of production but even with no activity this query performanve dos not improve.

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