May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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Do queries return significantly more data than they did earlier?
If you've initially tested your queries on almost empty tables, it is entirely possible that you are querying much more data than you need.
As an example, if you select all users' items and then show the first 10 items, this query runs very fast when the user has 10 or even 50 items, but not so well when they have 50,000.
Ensure that you don't ask for more data than you need. Use the LIMIT clause to return less data to your application (and to give the optimizer at least a chance to select a plan that processes less data when selecting: it may also have a lower startup cost). In some cases, you can evaluate the use of cursors for your applications.
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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.
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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.