Best current practices against queries running slow after database upgrade

http://gavinsoorma.com/2011/02/upgrade-to-11g-and-ensure-optimizer-plan-stability-using-sql-plan-baselines/comment-page-1/

http://www.perftuning.com/wp-content/uploads/2013/10/Using-SQL-Tuning-Sets-for-Plan-Stability.pdf

  • Things to Consider Before Upgrade to 11.2.0.2 in Relation to Database Performance          [Document 1320966.1]
  • Query Performance Degradation – Upgrade Related – Recommended Actions          [Document 745216.1]
  • TROUBLESHOOTING: Server Upgrade Results in Slow Query Performance          [Document 160089.1]
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