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 to do it…
Take a query that needs to do a big chunk of work, such as the following:
\timingSELECT count(*) FROM accounts;count---------1000000(1 row)Time: 261.652 msSET max_parallel_workers_per_gather = 8;SELECT count(*) FROM accounts;count---------1000000(1 row)Time: 180.513 ms
By setting the max_parallel_workers_per_gather parameter, we've improved performance using parallel query. Note that we didn't need to change the query at all.
In PostgreSQL 9.6 and 10, parallel query only works for read-only queries, so only SELECT statements that do not contain the FOR clause (for example, SELECT ... FOR UPDATE). In addition, a parallel query can only use functions or aggregates that are marked as PARALLEL SAFE. No user-defined functions are ...
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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.