Oracle hints are optimizer directives that are used in SQL de-bugging to change the default execution plan for SQL. Once the SQL has been optimized by adding the hint, the Oracle professional will adjust schema statistics (using dbms_stats) to replicate the execution plan without the hint. Oracle parallel hint tips Oracle Database Tips by Donald BurlesonMarch 31, Question: I want to understand how the parallel hint works inside a SQL statement and I also want to know the optimal degree for the parallel hint. Oracle checks the statement for a parallel hint. If such a hint is found, the hint overrides the degree of parallelism obtained as a result of the previous step. You can use the PARALLEL and PARALLEL_INDEX hints to specify the degree of parallelism for a SELECT statement.
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