BI jobs performance degradation after Oracle 11.2.0.4 to 12.1.0.2 migration

If you have performance problems after migrating your BI databases from 11.2.0.4 to 12.1.0.2 or any other performance issue, you should not underestimate SQL Plan Notes, which can point you to the right direction or just let you understand what exactly is going on with your queries. Please check below how SQL Plan Notes helped me to investigate problem I recently encountered.

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