Database Tuning (MOSC)

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Upgrading to 19c and SQL PLAN BASELINE

in Database Tuning (MOSC) 2 commentsAnswered

Hello everyone

we have inherited a 12c R2 database and it is a 2 node RAC running on Exadata 

We are in the process of upgrading the database to 19c

Currently,the capturing of the SQL PLAN baselines is disabled in our 12c Database

show parameter sql_plan

NAME                 TYPE    VALUE

------------------------------------ ----------- ------------------------------

optimizer_capture_sql_plan_baselines boolean   FALSE

optimizer_use_sql_plan_baselines   boolean   TRUE

CURSOR_SHARING is set to FORCE 

As we mentioned above, this is a system that we inherited and we are told by the DBAs that current plans are working all right but from time to time they had to flush the shared pool of either instances to get rid of a bad plan and as a result of that it fixed the performance issue for that SQL

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