November 2019
Beginner to intermediate
470 pages
11h 59m
English
Content preview from Mastering PostgreSQL 12 - Third Edition
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Making use of more VACUUM features
VACUUM has steadily been improved over the years. In this section, you will learn about some of the more recent improvements.
In many cases, VACUUM can skip pages. This is especially true when the visibility map suggests that a block is visible to everyone. VACUUM may also skip a page that is heavily used by some other transaction. DISABLE_PAGE_SKIPPING disables this kind of behavior and ensures that all pages are cleaned during this run.
One more way to improve on VACUUM is to use SKIP_LOCKED: the idea here is to make sure that VACUUM does not harm concurrency. If SKIP_LOCKED is used, VACUUM will automatically skip over relations, which cannot instantly be locked, thus avoiding conflict resolution. This ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.