Database - RAC/Scalability (MOSC)

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Sql plan change

edited Jan 25, 2018 9:22AM in Database - RAC/Scalability (MOSC) 4 commentsAnswered

The sql job(MV refresh) schedule concurrent job  was running  fine  however suddenly it was running for more than 7 hour and spinning upon investigation it was observed the sql plan have got changed  ,

So the question is how the sql plan of the job got changed when there is no data update /change happen also  every weekend  gather  schema stats job run.

Does  gather schema jobs    have any impact on the sql plan ? if yes then should we run gather schema stats job or  what should be the approach on running gather schema stats

how to enforce the best sql plan and best sql  plan should not age out ?

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