October 2010
Intermediate to advanced
468 pages
11h 35m
English
Content preview from PostgreSQL 9.0 High PerformanceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Summary
A major goal of this chapter was not only to show you how a variety of queries execute, but to demonstrate through many examples how to set up a query testing playground for exploring that yourself. You shouldn't just read this chapter. You should load the Dell Store 2 data into your system and experiment with the queries yourself. If you're using PostgreSQL 9.0, the results you see should be nearly identical to the examples shown.
Try to understand how the queries are actually executed in each of these cases, based on the statistics available. Adjust the statistics collected and see if anything changes. Write new queries and see if the plans you get match what you expected. Watch how the optimizer degrades as you take away its advanced ...
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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.