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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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3
src/backend/postmaster/postmaster.c
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@@ -521,6 +521,7 @@ typedef struct
pg_time_t first_syslogger_file_time;
bool redirection_done;
bool IsBinaryUpgrade;
bool auto_query_id_enabled;
int max_safe_fds;
int MaxBackends;
#ifdef WIN32
@@ -6168,6 +6169,7 @@ save_backend_variables(BackendParameters *param, Port *port,
param->redirection_done = redirection_done;
param->IsBinaryUpgrade = IsBinaryUpgrade;
param->auto_query_id_enabled = auto_query_id_enabled;
param->max_safe_fds = max_safe_fds;
param->MaxBackends = MaxBackends;
@@ -6401,6 +6403,7 @@ restore_backend_variables(BackendParameters *param, Port *port)
redirection_done = param->redirection_done;
IsBinaryUpgrade = param->IsBinaryUpgrade;
auto_query_id_enabled = param->auto_query_id_enabled;
max_safe_fds = param->max_safe_fds;
MaxBackends = param->MaxBackends;