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Troubleshooting Oracle Performance, Second Edition
book

Troubleshooting Oracle Performance, Second Edition

by Christian Antognini
June 2014
Intermediate to advanced content levelIntermediate to advanced
740 pages
23h 59m
English
Apress
Content preview from Troubleshooting Oracle Performance, Second Edition

CHAPTER 6

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Introducing the Query Optimizer

The query optimizer is one of the building blocks of the SQL engine. Its purpose is to produce efficient execution plans in a timely manner. The time constraint is essential because in most situations it isn’t sensible to spend too much time on the optimization phase. What does “too much time” mean? In general, the parse phase, which contains the work performed by the query optimizer, should be much shorter than the execution phase. The only situation in which having a parse phase longer than the execution phase is acceptable is when a cursor can be reused for many executions. As discussed in Chapter ...

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Publisher Resources

ISBN: 9781430257585Purchase book