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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 13

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Optimizing Data Access

An execution plan, as described in Chapter 10, is composed of several operations. The most commonly used operations are those that access, filter, and transform data. This chapter specifically deals with data access operations, or, in other words, how the database engine is able to access data.

There are basically only two ways to locate data in a table. The first is to scan the whole table. The second is to do a lookup based on a redundant access structure (for example, an index) or on the structure containing the table itself (for example, a hash cluster). In addition, in the case of partitioning, access might ...

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Publisher Resources

ISBN: 9781430257585Purchase book