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6ab1dbd26b
This is preliminary patch. It adds NOT NULL checking for the result of pg_stat_statements_reset() function. It is needed for upcoming patch "Track statement entry timestamp" that will change the result type of this function to the timestamp of a reset performed. Discussion: https://postgr.es/m/flat/72e80e7b160a6eb189df9ef6f068cce3765d37f8.camel%40moonset.ru Author: Andrei Zubkov Reviewed-by: Julien Rouhaud, Hayato Kuroda, Yuki Seino, Chengxi Sun Reviewed-by: Anton Melnikov, Darren Rush, Michael Paquier, Sergei Kornilov Reviewed-by: Alena Rybakina, Andrei Lepikhov
152 lines
4.0 KiB
PL/PgSQL
152 lines
4.0 KiB
PL/PgSQL
--
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-- Statement level tracking
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--
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SET pg_stat_statements.track_utility = TRUE;
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- DO block - top-level tracking.
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CREATE TABLE stats_track_tab (x int);
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SET pg_stat_statements.track = 'top';
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DELETE FROM stats_track_tab;
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DO $$
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BEGIN
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DELETE FROM stats_track_tab;
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END;
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$$ LANGUAGE plpgsql;
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SELECT toplevel, calls, query FROM pg_stat_statements
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WHERE query LIKE '%DELETE%' ORDER BY query COLLATE "C", toplevel;
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- DO block - all-level tracking.
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SET pg_stat_statements.track = 'all';
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DELETE FROM stats_track_tab;
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DO $$
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BEGIN
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DELETE FROM stats_track_tab;
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END; $$;
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DO LANGUAGE plpgsql $$
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BEGIN
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-- this is a SELECT
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PERFORM 'hello world'::TEXT;
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END; $$;
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SELECT toplevel, calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C", toplevel;
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-- DO block - top-level tracking without utility.
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SET pg_stat_statements.track = 'top';
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SET pg_stat_statements.track_utility = FALSE;
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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DELETE FROM stats_track_tab;
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DO $$
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BEGIN
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DELETE FROM stats_track_tab;
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END; $$;
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DO LANGUAGE plpgsql $$
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BEGIN
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-- this is a SELECT
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PERFORM 'hello world'::TEXT;
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END; $$;
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SELECT toplevel, calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C", toplevel;
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-- DO block - all-level tracking without utility.
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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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DELETE FROM stats_track_tab;
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DO $$
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BEGIN
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DELETE FROM stats_track_tab;
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END; $$;
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DO LANGUAGE plpgsql $$
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BEGIN
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-- this is a SELECT
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PERFORM 'hello world'::TEXT;
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END; $$;
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SELECT toplevel, calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C", toplevel;
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-- PL/pgSQL function - top-level tracking.
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SET pg_stat_statements.track = 'top';
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SET pg_stat_statements.track_utility = FALSE;
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
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DECLARE
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r INTEGER;
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BEGIN
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SELECT (i + 1 + 1.0)::INTEGER INTO r;
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RETURN r;
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END; $$ LANGUAGE plpgsql;
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SELECT PLUS_TWO(3);
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SELECT PLUS_TWO(7);
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-- SQL function --- use LIMIT to keep it from being inlined
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CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
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$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
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SELECT PLUS_ONE(8);
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SELECT PLUS_ONE(10);
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- immutable SQL function --- can be executed at plan time
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CREATE FUNCTION PLUS_THREE(i INTEGER) RETURNS INTEGER AS
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$$ SELECT i + 3 LIMIT 1 $$ IMMUTABLE LANGUAGE SQL;
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SELECT PLUS_THREE(8);
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SELECT PLUS_THREE(10);
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SELECT toplevel, calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- PL/pgSQL function - all-level tracking.
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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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-- we drop and recreate the functions to avoid any caching funnies
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DROP FUNCTION PLUS_ONE(INTEGER);
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DROP FUNCTION PLUS_TWO(INTEGER);
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DROP FUNCTION PLUS_THREE(INTEGER);
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-- PL/pgSQL function
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CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
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DECLARE
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r INTEGER;
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BEGIN
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SELECT (i + 1 + 1.0)::INTEGER INTO r;
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RETURN r;
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END; $$ LANGUAGE plpgsql;
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SELECT PLUS_TWO(-1);
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SELECT PLUS_TWO(2);
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-- SQL function --- use LIMIT to keep it from being inlined
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CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
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$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
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SELECT PLUS_ONE(3);
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SELECT PLUS_ONE(1);
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
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-- immutable SQL function --- can be executed at plan time
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CREATE FUNCTION PLUS_THREE(i INTEGER) RETURNS INTEGER AS
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$$ SELECT i + 3 LIMIT 1 $$ IMMUTABLE LANGUAGE SQL;
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SELECT PLUS_THREE(8);
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SELECT PLUS_THREE(10);
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SELECT toplevel, calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
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--
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-- pg_stat_statements.track = none
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--
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SET pg_stat_statements.track = 'none';
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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SELECT 1 AS "one";
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SELECT 1 + 1 AS "two";
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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