Chapter 9

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Execution Plan Cache Analysis

The performance of any query depends on the effectiveness of the execution plan decided upon by the optimizer, as you learned in previous chapters. Because the overall time required to execute a query is the sum of the time required to generate the execution plan plus the time required to execute the query based on this execution plan, it is important that the cost of generating the execution plan itself is low. The cost incurred when generating the execution plan depends on the process of generating the execution plan, the process of caching the plan, and the reusability of the plan from the plan cache. ...

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