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Correct usage of Parallel Hints

edited Sep 13, 2024 7:52PM in SQL Performance (MOSC) 7 commentsAnswered ✓

Oracle Database 19c Enterprise Edition Release 19.0.0.0.0
Exadata

I am attempting to improve one of the queries that our application developers had reported that is being problematic and is taking long time to complete. Their query involves Parallel Hints. When I run the explain on the query it is giving me some Hint Report and Notes that tells something wrong about the syntax or it's usage. Although it appears to be that the parallel DML is actually being used, there's a P->S conversion occurring after the load as seen on the plan. Which I think might be oracle is ignoring the hints and doing it's own parallelism.

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