The UNNEST hint tells Oracle to check the subquery block for validity only. If your subquery block is legitimate, then subquery unnesting is enabled without the need of Oracle's checking the heuristics.
The parallel execution hints instruct the optimizer about no matter whether and how to parallelize functions. You may use the next parallel hints:
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If this trace specifies a list of available indexes, then the optimizer would not take into account a scan on any of the desired indexes. Other indexes not laid out in the checklist remain thought of.
Such as, a PARTITION distribution make use of the partitioning info in the table becoming loaded to distribute rows within the question slaves towards the load slaves. Use this system when the subsequent ailments are satisfied:
You may deliver hints for your SQL assertion on the optimizer by enclosing them within a comment within the assertion.
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If this sort of a hint exists in the very best-amount question, then the databases uses this hint irrespective of any these types of hints inside the views.
The INDEX_ASC trace explicitly chooses an index scan for the required table. When the statement uses an index selection scan, then Oracle scans the index entries in ascending purchase in their indexed values.
The CLUSTER hint explicitly chooses a cluster scan to entry the specified desk. It applies only to clustered objects.
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The sampling stages are as follows In case the dynamic sampling level made use view website of is from a cursor trace or through the optimizer_dynamic_sampling parameter: