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 16
Plan Stability
One of the most frustrating things about Oracle’s Cost-Based Optimizer (CBO) is its tendency to change plans for statements at seemingly random intervals. Of course, these changes are not random at all. But, because the optimizer code is so complex, it’s often difficult to determine why a plan changes. Oracle recognized this issue years ago and has been working to improve the situation for at least a decade. It has provided many tools for identifying when plans change and why they change. Oracle has also provided numerous tools that allow you to exert varying degrees of control over the execution plans the optimizer ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.