Parallel query hinting boosts certain query performances on multi-processor systems via parallel processing. The SQL optimizer determines when this is beneficial. On single-processor systems, this hint has no effect.
Parallel processing can be managed by:
Setting the auto parallel option system-wide.Using the %PARALLEL keyword in the FROM clause of specific queries.
%PARALLEL is ignored when it applied to:
- INSERT, UPDATE, and DELETE queries (Only SELECT queries benefit from this feature)
- The queries involving process-specific functions or variables
- A subquery correlated with an encl

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