October 2013
Intermediate to advanced
580 pages
18h 5m
English
book
Pro Oracle SQL, Second Edition
by Karen Morton, Kerry Osborne, Robyn Sands, Riyaj Shamsudeen, Jared Still
Content preview from Pro Oracle SQL, Second Edition
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CHAPTER 3
Access and Join Methods
The optimizer must determine how to access the data your SQL statements require. You formulate your statement and the optimizer, during a hard parse, figures out which operations should provide the data in the most effective way possible. Using statistics as the primary guide, the optimizer computes the cost of the possible alternatives first to access data and then to join multiple tables to get the final result set. The more you understand the different access and join methods the optimizer considers, the more likely you are to formulate your SQL to help the optimizer make the best choices. And, when the operation ...
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