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Add plan_cache_mode setting

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This allows overriding the choice of custom or generic plan.

Author: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAFj8pRAGLaiEm8ur5DWEBo7qHRWTk9HxkuUAz00CZZtJj-LkCA%40mail.gmail.com
This commit is contained in:
Peter Eisentraut
2018-07-16 13:35:41 +02:00
parent a06e56b247
commit f7cb2842bf
7 changed files with 179 additions and 0 deletions
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19
src/backend/utils/misc/guc.c
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@ -405,6 +405,13 @@ static const struct config_enum_entry force_parallel_mode_options[] = {
{NULL, 0, false}
};
static const struct config_enum_entry plan_cache_mode_options[] = {
{"auto", PLAN_CACHE_MODE_AUTO, false},
{"force_generic_plan", PLAN_CACHE_MODE_FORCE_GENERIC_PLAN, false},
{"force_custom_plan", PLAN_CACHE_MODE_FORCE_CUSTOM_PLAN, false},
{NULL, 0, false}
};
/*
* password_encryption used to be a boolean, so accept all the likely
* variants of "on", too. "off" used to store passwords in plaintext,
@ -4150,6 +4157,18 @@ static struct config_enum ConfigureNamesEnum[] =
NULL, NULL, NULL
},
{
{"plan_cache_mode", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Controls the planner's selection of custom or generic plan."),
gettext_noop("Prepared statements can have custom and generic plans, and the planner "
"will attempt to choose which is better. This can be set to override "
"the default behavior.")
},
&plan_cache_mode,
PLAN_CACHE_MODE_AUTO, plan_cache_mode_options,
NULL, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL, NULL