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…
By default, a query will use only one process. Parallel query is enabled by setting max_parallel_workers_per_gather to a value higher than zero. This parameter specifies the maximum number of additional processes that are available, if needed. So, a setting of 1 will mean you have the leader process plus one additional worker process, so two processes in total.
The query optimizer will decide whether parallel query is a useful plan based upon cost, just like other aspects of the optimizer. Importantly, it will decide how many parallel workers to use in its plan, up to the maximum you specify.
Across the whole server, the maximum number of worker processes available is specified by the max_worker_processes parameter and is set ...
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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.