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How to force sql_id to use certain plan hash value

edited Aug 31, 2020 4:52PM in SQL Performance (MOSC) 6 commentsAnswered ✓

I have some SQLs like on screenshot bellow witch runs with different plans. Some times SQL runs with good SQL Plan which executes 0.1 ms but some times it takes 1 hour.

How can i force SQL_id to use certain plan hash value. and why it occurs ?  This problem occurs each time after restart of oracle and continues 3-4 day.

My environment is : Oracle 12c RAC on OEL 6.7

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