The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/10/static/pgstatstatements.html Description:
At the top of the pg_stat_statements docs page[1] it states: "The pg_stat_statements module provides a means for tracking execution statistics of all SQL statements executed by a server." This is not strictly true. In cases where large numbers of queries are cancelled, such as by `statement_timeout` on a loaded server, they are not in fact recorded by pg_stat_statements. This has been brought up on the mailing list [2] and has been stated as the intended behavior. This can be surprising particularly if cancelled queries account for a large amount of server execution time in pathological cases. Perhaps a simple change such as this would help clarify this: "The pg_stat_statements module provides a means for tracking execution statistics of all SQL statements successfully executed by a server." Or an explicit callout that cancelled queries do not count regardless of how much execution time they actually use. -Casey [1] https://www.postgresql.org/docs/10/static/pgstatstatements.html [2] https://www.postgresql.org/message-id/20171112222811.1464.28388%40wrigleys.postgresql.org
