The USE_CONCAT trace forces blended OR circumstances from the WHERE clause of a question to generally be remodeled into a compound question utilizing the UNION ALL set operator. Usually, this transformation happens provided that the price of the query using the concatenations is much less expensive than the price without having them.
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For the reason that nonmergeable views are optimized individually within the top-level query, access path and be a part of hints inside the view are preserved. For the same reason, entry path hints over the view in the very best-degree question are disregarded.
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The STAR hint forces a star question strategy to be used, if at all possible. A star system has the biggest desk while in the query final during the be part of important site purchase and joins it which has a nested loops sign up for on the concatenated index.
If this trace important link specifies an inventory of obtainable indexes, then the optimizer does not contemplate a scan on any of the required indexes. Other indexes not laid out in the record remain viewed as.
The NO_PUSH_SUBQ hint results in non-merged subqueries for being evaluated as the last step in the execution system. In case the subquery is pretty high priced or doesn't cut down the number of rows substantially, then it improves performance to evaluate the subquery last.
The INDEX_DESC hint explicitly chooses an index scan for the desired desk. If the assertion makes use of an index array scan, then Oracle scans the index entries in descending order of their indexed values. Within a partitioned index, the outcomes are in descending purchase within Just about every partition.
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The PUSH_SUBQ hint causes non-merged subqueries being evaluated in the earliest achievable step while in the execution plan. Normally, subqueries that are not merged are executed as the final step while in the execution prepare.