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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How it works…
ALTER TABLE ... ADD CONSTRAINT.. NOT VALID uses ShareRowExclusiveLock, which blocks writes, and VACUUM, yet allows reads on the table to continue. The ALTER TABLE ... VALIDATE CONSTRAINT command executes using ShareUpdateExclusiveLock, which allows both reads and writes on the table, yet blocks DDL and VACUUM while it scans the table.
PostgreSQL takes SQL locks according to the ISO standard, that is, locks are taken during the transaction and then released at its end. This means that algorithms like this one, where there is a short activity requiring stronger locks, followed by a longer activity that needs only lighter locks, cannot be implemented as a single command.
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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.