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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Using statement_timeout to clean up queries that take too long to run
Often, you know that you don't have any use for queries running longer than a given time. Maybe your web frontend just refuses to wait for more than 10 seconds for a query to complete and returns a default answer to users if it takes longer, abandoning the query.
In such a case, it might be a good idea to set statement_timeout = 10 sec, either in postgresql.conf or as a per-user or per-database setting. Once you do so, queries running too long won't consume precious resources and make other queries fail.
The queries terminated by a statement timeout show up in the log, as follows:
postgres=# SET statement_timeout TO '3 s';SETpostgres=# SELECT pg_sleep(10);ERROR: canceling ...
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