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Add generic_plans and custom_plans fields into pg_prepared_statements.

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There was no easy way to find how many times generic and custom plans
have been executed for a prepared statement. This commit exposes those
numbers of times in pg_prepared_statements view.

Author: Atsushi Torikoshi, Kyotaro Horiguchi
Reviewed-by: Tatsuro Yamada, Masahiro Ikeda, Fujii Masao
Discussion: https://postgr.es/m/CACZ0uYHZ4M=NZpofH6JuPHeX=__5xcDELF8hT8_2T+R55w4RQw@mail.gmail.com
This commit is contained in:
Fujii Masao
2020-07-20 11:55:50 +09:00
parent 044dc7b964
commit d05b172a76
8 changed files with 105 additions and 16 deletions
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17
src/backend/utils/cache/plancache.c vendored
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@ -218,6 +218,7 @@ CreateCachedPlan(RawStmt *raw_parse_tree,
plansource->generation = 0;
plansource->generic_cost = -1;
plansource->total_custom_cost = 0;
plansource->num_generic_plans = 0;
plansource->num_custom_plans = 0;
MemoryContextSwitchTo(oldcxt);
@ -285,6 +286,7 @@ CreateOneShotCachedPlan(RawStmt *raw_parse_tree,
plansource->generation = 0;
plansource->generic_cost = -1;
plansource->total_custom_cost = 0;
plansource->num_generic_plans = 0;
plansource->num_custom_plans = 0;
return plansource;
@ -1213,12 +1215,14 @@ GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams,
{
/* Build a custom plan */
plan = BuildCachedPlan(plansource, qlist, boundParams, queryEnv);
/* Accumulate total costs of custom plans, but 'ware overflow */
if (plansource->num_custom_plans < INT_MAX)
{
plansource->total_custom_cost += cached_plan_cost(plan, true);
plansource->num_custom_plans++;
}
/* Accumulate total costs of custom plans */
plansource->total_custom_cost += cached_plan_cost(plan, true);
plansource->num_custom_plans++;
}
else
{
plansource->num_generic_plans++;
}
Assert(plan != NULL);
@ -1574,6 +1578,7 @@ CopyCachedPlan(CachedPlanSource *plansource)
/* We may as well copy any acquired cost knowledge */
newsource->generic_cost = plansource->generic_cost;
newsource->total_custom_cost = plansource->total_custom_cost;
newsource->num_generic_plans = plansource->num_generic_plans;
newsource->num_custom_plans = plansource->num_custom_plans;
MemoryContextSwitchTo(oldcxt);