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3357471cf9
This patch adds two new counters to pg_stat_statements:
- generic_plan_calls
- custom_plan_calls
These counters track how many times a prepared statement was executed
using a generic or custom plan, respectively, providing a global
equivalent at query level, for top and non-top levels, of
pg_prepared_statements whose data is restricted to a single session.
This commit builds upon e125e36002. The module is bumped to version
1.13. PGSS_FILE_HEADER is bumped as well, something that the latest
patches touching the on-disk format of the PGSS file did not actually
bother with since 2022..
Author: Sami Imseih <samimseih@gmail.com>
Reviewed-by: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
Reviewed-by: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Nikolay Samokhvalov <nik@postgres.ai>
Discussion: https://postgr.es/m/CAA5RZ0uFw8Y9GCFvafhC=OA8NnMqVZyzXPfv_EePOt+iv1T-qQ@mail.gmail.com
95 lines
2.8 KiB
PL/PgSQL
95 lines
2.8 KiB
PL/PgSQL
--
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-- Tests with plan cache
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--
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-- Setup
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CREATE OR REPLACE FUNCTION select_one_func(int) RETURNS VOID AS $$
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DECLARE
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ret INT;
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BEGIN
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SELECT $1 INTO ret;
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END;
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$$ LANGUAGE plpgsql;
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CREATE OR REPLACE PROCEDURE select_one_proc(int) AS $$
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DECLARE
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ret INT;
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BEGIN
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SELECT $1 INTO ret;
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END;
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$$ LANGUAGE plpgsql;
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-- Prepared statements
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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PREPARE p1 AS SELECT $1 AS a;
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SET plan_cache_mode TO force_generic_plan;
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EXECUTE p1(1);
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SET plan_cache_mode TO force_custom_plan;
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EXECUTE p1(1);
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SELECT calls, generic_plan_calls, custom_plan_calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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DEALLOCATE p1;
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-- Extended query protocol
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT $1 AS a \parse p1
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SET plan_cache_mode TO force_generic_plan;
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\bind_named p1 1
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;
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SET plan_cache_mode TO force_custom_plan;
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\bind_named p1 1
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;
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SELECT calls, generic_plan_calls, custom_plan_calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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\close_prepared p1
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-- EXPLAIN [ANALYZE] EXECUTE
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SET pg_stat_statements.track = 'all';
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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PREPARE p1 AS SELECT $1;
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SET plan_cache_mode TO force_generic_plan;
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EXPLAIN (COSTS OFF) EXECUTE p1(1);
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EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) EXECUTE p1(1);
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SET plan_cache_mode TO force_custom_plan;
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EXPLAIN (COSTS OFF) EXECUTE p1(1);
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EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) EXECUTE p1(1);
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SELECT calls, generic_plan_calls, custom_plan_calls, toplevel, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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RESET pg_stat_statements.track;
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DEALLOCATE p1;
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-- Functions/procedures
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SET pg_stat_statements.track = 'all';
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SET plan_cache_mode TO force_generic_plan;
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SELECT select_one_func(1);
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CALL select_one_proc(1);
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SET plan_cache_mode TO force_custom_plan;
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SELECT select_one_func(1);
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CALL select_one_proc(1);
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SELECT calls, generic_plan_calls, custom_plan_calls, toplevel, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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--
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-- EXPLAIN [ANALYZE] EXECUTE + functions/procedures
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--
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SET pg_stat_statements.track = 'all';
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SET plan_cache_mode TO force_generic_plan;
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EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT select_one_func(1);
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EXPLAIN (COSTS OFF) SELECT select_one_func(1);
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CALL select_one_proc(1);
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SET plan_cache_mode TO force_custom_plan;
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EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT select_one_func(1);
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EXPLAIN (COSTS OFF) SELECT select_one_func(1);
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CALL select_one_proc(1);
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SELECT calls, generic_plan_calls, custom_plan_calls, toplevel, query FROM pg_stat_statements
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ORDER BY query COLLATE "C", toplevel;
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RESET pg_stat_statements.track;
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--
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-- Cleanup
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--
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DROP FUNCTION select_one_func(int);
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DROP PROCEDURE select_one_proc(int);
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