The NO_PUSH_SUBQ trace causes non-merged subqueries for being evaluated as the final move during the execution strategy. When the subquery is fairly expensive or doesn't minimize the number of rows drastically, then it enhances functionality to evaluate the subquery past.
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Oracle won't motivate the usage of hints inside of or on views (or subqueries). This is since you can define views in a single context and rely on them in A further.
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department_id; The next question reveals a list usage report through which the optimizer avoids a sort with the Team BY operation by utilizing the form merge operation specified by the USE_MERGE hint.
The functionality benefit will only be apparent in excess of greater knowledge volumes. Above Those people volumes you will likely be improved off merging the sub-question (begin to see the UNNEST trace).
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Optimizer hints can be used with SQL statements to alter execution ideas. This chapter describes the best way to use hints to power many techniques.
These statements cannot be optimized for ideal response time, simply because Oracle should retrieve all rows accessed because of the assertion right before returning the initial row. When you specify this trace in any of such statements, then the optimizer employs the fee-based strategy and optimizes for finest throughput.
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In case you provide numerous indexes, Oracle will often choose the finest one within the checklist specified. Beware Read Full Report though that You do not fall to the AND-EQUAL trap.
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If this hint specifies a list of available indexes, then the optimizer considers the cost of a scan on each index inside the listing and afterwards performs the index scan with the lowest Price tag.