October 2003
Intermediate to advanced
1072 pages
24h 21m
English
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Optimization Stages
Figure 12.1 outlines the query optimization process. Once the optimizer receives a relational operator tree into which the initial parsed query has been placed, it begins optimizing it—searching for a means of carrying out the work it requires with the least amount of cost and changing it as necessary to accomplish that. Generally speaking, each successive phase or stage of the optimization process allows more sophisticated (and often more expensive) options to be considered for transforming the initial relational operator tree presented by the parser into an optimized execution plan. If a suitably inexpensive plan is found during this process, it can be returned without requiring further optimization or evaluation of potential ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.