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 Originally Posted by oraclej
check the parameter of undo rentention . if it is 3600 or more than than reduce to 900 seconds then the performance will increase.
1- Performance would not "increase", that's false.
2- Performance is not the issue poster is facing.
3- Lowering undo_retention would increase ORA-01555 likelihood.
Are you trying to misslead poster on purpose? 
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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