The optimizer determines that a relatively expensive desk scan can be expected for this table which includes not been analyzed.
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The INDEX trace relates to the worker table in the main branch of the UNION ALL view v, never to the worker desk in the next department.
Then, for each branch of the UNION ALL, Oracle tries a rewrite having a materialized view. The rewrite may perhaps do a joinback and rollup from the materialized view. Eventually, Oracle looks at the branches not rewritten and tries to symbolize them as just one question block see post with grouping sets.
Oracle ignores hints that contains syntax mistakes, but considers other properly specified hints inside the exact remark.
The optimizer ignores this hint in DELETE and UPDATE statement blocks As well as in Decide on statement blocks that contain any of the subsequent syntax:
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To find out more on unnesting nested subqueries as well as situations that make a subquery block valid
Thus, Despite the fact that you gave the INDEX hint, the optimizer may not necessarily use that hint, since the optimizer might need decided that the asked for index can't be made use of a result of the see here now be part of strategies and accessibility paths selected by the optimizer.
The PARALLEL_INDEX hint specifies the desired variety of concurrent servers that can be utilized to parallelize index vary scans for partitioned indexes.