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Allow compute_query_id to be set to 'auto' and make it default

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Allowing only on/off meant that all either all existing configuration
guides would become obsolete if we disabled it by default, or that we
would have to accept a performance loss in the default config if we
enabled it by default.  By allowing 'auto' as a middle ground, the
performance cost is only paid by those who enable pg_stat_statements and
similar modules.

I only edited the release notes to comment-out a paragraph that is now
factually wrong; further edits are probably needed to describe the
related change in more detail.

Author: Julien Rouhaud <rjuju123@gmail.com>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/20210513002623.eugftm4nk2lvvks3@nol
This commit is contained in:
Alvaro Herrera
2021-05-15 14:13:09 -04:00
parent 30d8bad494
commit cafde58b33
14 changed files with 108 additions and 30 deletions
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6
contrib/pg_stat_statements/pg_stat_statements.c
View File

@ -369,6 +369,12 @@ _PG_init(void)
if (!process_shared_preload_libraries_in_progress)
return;
/*
* Inform the postmaster that we want to enable query_id calculation if
* compute_query_id is set to auto.
*/
EnableQueryId();
/*
* Define (or redefine) custom GUC variables.
*/

1
contrib/pg_stat_statements/pg_stat_statements.conf
View File

@ -1,2 +1 @@
shared_preload_libraries = 'pg_stat_statements'
compute_query_id = on