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19c database upgrade performance issue with optimizer_features_enable

in SQL Performance (MOSC) 5 comments

1. After upgrading our databases to 19.8 the performance is worst for almost all the databases.

2. The same things works pretty well on 11g.

4. Need to drill down what 19c feature is causing the queries to be slow down.

5. upon doing lots of analysis, it is found things are working well with optimizer_features_enable to 11.2.0.4 but with optimizer_features_enable 19.1.0 all the performance is dying.

6. We need to have oracle to provide to get it drill down what exact 19c option or feature is blocking the performance.

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