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1515 lines
50 KiB
1515 lines
50 KiB
--
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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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t
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---
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t
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(1 row)
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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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toplevel | calls | query
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----------+-------+--------------------------------
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t | 1 | DELETE FROM stats_track_tab
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t | 1 | 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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(2 rows)
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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t
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---
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t
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(1 row)
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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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toplevel | calls | query
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----------+-------+----------------------------------------------------
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f | 1 | DELETE FROM stats_track_tab
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t | 1 | DELETE FROM stats_track_tab
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t | 1 | DO $$ +
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| | BEGIN +
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| | DELETE FROM stats_track_tab; +
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| | END; $$
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t | 1 | 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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f | 1 | SELECT $1::TEXT
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t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
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t | 1 | SET pg_stat_statements.track = $1
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(7 rows)
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-- Procedure with multiple utility statements.
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CREATE OR REPLACE PROCEDURE proc_with_utility_stmt()
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LANGUAGE SQL
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AS $$
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SHOW pg_stat_statements.track;
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show pg_stat_statements.track;
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SHOW pg_stat_statements.track_utility;
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$$;
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SET pg_stat_statements.track_utility = TRUE;
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-- 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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t
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---
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t
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(1 row)
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CALL proc_with_utility_stmt();
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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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toplevel | calls | query
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----------+-------+----------------------------------------------------
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t | 1 | CALL proc_with_utility_stmt()
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t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
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f | 2 | SHOW pg_stat_statements.track
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f | 1 | SHOW pg_stat_statements.track_utility
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(4 rows)
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-- top-level tracking.
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SET pg_stat_statements.track = 'top';
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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t
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---
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t
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(1 row)
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CALL proc_with_utility_stmt();
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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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toplevel | calls | query
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----------+-------+----------------------------------------------------
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t | 1 | CALL proc_with_utility_stmt()
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t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
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(2 rows)
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-- EXPLAIN - all-level tracking.
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CREATE TABLE test_table (x int);
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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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t
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---
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t
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(1 row)
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EXPLAIN (COSTS OFF) SELECT 1;
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) (SELECT 1, 2);
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) TABLE stats_track_tab;
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QUERY PLAN
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-----------------------------
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Seq Scan on stats_track_tab
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(1 row)
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EXPLAIN (COSTS OFF) (TABLE test_table);
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QUERY PLAN
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------------------------
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Seq Scan on test_table
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(1 row)
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EXPLAIN (COSTS OFF) VALUES (1);
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) (VALUES (1, 2));
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
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QUERY PLAN
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-----------------------------------
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Update on stats_track_tab
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-> Seq Scan on stats_track_tab
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Filter: (x = 1)
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(3 rows)
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EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab;
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QUERY PLAN
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-----------------------------------
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Delete on stats_track_tab
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-> Seq Scan on stats_track_tab
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(2 rows)
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EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1));
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QUERY PLAN
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---------------------------
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Insert on stats_track_tab
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-> Result
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(2 rows)
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EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab
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USING (SELECT id FROM generate_series(1, 10) id) ON x = id
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WHEN MATCHED THEN UPDATE SET x = id
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WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
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QUERY PLAN
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-------------------------------------------------------
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Merge on stats_track_tab
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-> Hash Right Join
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Hash Cond: (stats_track_tab.x = id.id)
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-> Seq Scan on stats_track_tab
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-> Hash
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-> Function Scan on generate_series id
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(6 rows)
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EXPLAIN (COSTS OFF) SELECT 1 UNION SELECT 2;
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QUERY PLAN
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--------------------------
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Unique
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-> Sort
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Sort Key: (1)
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-> Append
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-> Result
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-> Result
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(6 rows)
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SELECT toplevel, calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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toplevel | calls | query
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----------+-------+--------------------------------------------------------------------
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f | 1 | DELETE FROM stats_track_tab
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t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2)
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t | 1 | EXPLAIN (COSTS OFF) (TABLE test_table)
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t | 1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
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t | 1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
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t | 1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
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t | 1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab +
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| | USING (SELECT id FROM generate_series($1, $2) id) ON x = id +
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| | WHEN MATCHED THEN UPDATE SET x = id +
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| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1 UNION SELECT $2
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t | 1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
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t | 1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
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t | 1 | EXPLAIN (COSTS OFF) VALUES ($1)
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f | 1 | INSERT INTO stats_track_tab VALUES (($1))
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f | 1 | MERGE INTO stats_track_tab +
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| | USING (SELECT id FROM generate_series($1, $2) id) ON x = id +
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| | WHEN MATCHED THEN UPDATE SET x = id +
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| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
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f | 1 | SELECT $1
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f | 1 | SELECT $1 UNION SELECT $2
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f | 1 | SELECT $1, $2
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t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
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f | 1 | TABLE stats_track_tab
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f | 1 | TABLE test_table
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f | 1 | UPDATE stats_track_tab SET x = $1 WHERE x = $2
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f | 1 | VALUES ($1)
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f | 1 | VALUES ($1, $2)
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(23 rows)
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-- EXPLAIN - top-level tracking.
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SET pg_stat_statements.track = 'top';
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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t
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---
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t
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(1 row)
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EXPLAIN (COSTS OFF) SELECT 1;
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) (SELECT 1, 2);
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) TABLE stats_track_tab;
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QUERY PLAN
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-----------------------------
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Seq Scan on stats_track_tab
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(1 row)
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EXPLAIN (COSTS OFF) (TABLE test_table);
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QUERY PLAN
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------------------------
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Seq Scan on test_table
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(1 row)
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EXPLAIN (COSTS OFF) VALUES (1);
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) (VALUES (1, 2));
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
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QUERY PLAN
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-----------------------------------
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Update on stats_track_tab
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-> Seq Scan on stats_track_tab
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Filter: (x = 1)
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(3 rows)
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EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab;
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QUERY PLAN
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-----------------------------------
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Delete on stats_track_tab
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-> Seq Scan on stats_track_tab
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(2 rows)
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EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1));
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QUERY PLAN
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---------------------------
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Insert on stats_track_tab
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-> Result
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(2 rows)
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EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab
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USING (SELECT id FROM generate_series(1, 10) id) ON x = id
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WHEN MATCHED THEN UPDATE SET x = id
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WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
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QUERY PLAN
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-------------------------------------------------------
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Merge on stats_track_tab
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-> Hash Right Join
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Hash Cond: (stats_track_tab.x = id.id)
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-> Seq Scan on stats_track_tab
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-> Hash
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-> Function Scan on generate_series id
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(6 rows)
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EXPLAIN (COSTS OFF) SELECT 1 UNION SELECT 2;
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QUERY PLAN
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--------------------------
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Unique
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-> Sort
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Sort Key: (1)
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-> Append
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-> Result
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-> Result
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(6 rows)
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SELECT toplevel, calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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toplevel | calls | query
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----------+-------+--------------------------------------------------------------------
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t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2)
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t | 1 | EXPLAIN (COSTS OFF) (TABLE test_table)
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t | 1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
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t | 1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
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t | 1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
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t | 1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab +
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| | USING (SELECT id FROM generate_series($1, $2) id) ON x = id +
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| | WHEN MATCHED THEN UPDATE SET x = id +
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| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1 UNION SELECT $2
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t | 1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
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t | 1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
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t | 1 | EXPLAIN (COSTS OFF) VALUES ($1)
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t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
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(12 rows)
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-- EXPLAIN - all-level tracking with multi-statement strings.
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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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t
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---
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t
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(1 row)
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-- SELECT queries
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EXPLAIN (COSTS OFF) SELECT 1\; EXPLAIN (COSTS OFF) SELECT 1, 2;
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QUERY PLAN
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------------
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Result
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(1 row)
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) (SELECT 1, 2, 3)\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3, 4);
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QUERY PLAN
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------------
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Result
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(1 row)
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QUERY PLAN
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------------
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Result
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(1 row)
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EXPLAIN (COSTS OFF) SELECT 1, 2 UNION SELECT 3, 4\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3) UNION SELECT 3, 4, 5;
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QUERY PLAN
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----------------------------
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Unique
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-> Sort
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Sort Key: (1), (2)
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-> Append
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-> Result
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-> Result
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(6 rows)
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QUERY PLAN
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---------------------------------
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Unique
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-> Sort
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Sort Key: (1), (2), (3)
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-> Append
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-> Result
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-> Result
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(6 rows)
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SELECT toplevel, calls, query FROM pg_stat_statements
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ORDER BY query COLLATE "C";
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toplevel | calls | query
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----------+-------+-----------------------------------------------------------------
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f | 1 | (SELECT $1, $2, $3) UNION SELECT $4, $5, $6
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t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3)
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t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3) UNION SELECT $4, $5, $6
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t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3, $4)
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1, $2
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t | 1 | EXPLAIN (COSTS OFF) SELECT $1, $2 UNION SELECT $3, $4
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f | 1 | SELECT $1
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f | 1 | SELECT $1, $2
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f | 1 | SELECT $1, $2 UNION SELECT $3, $4
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f | 1 | SELECT $1, $2, $3
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f | 1 | SELECT $1, $2, $3, $4
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t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
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(13 rows)
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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t
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---
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t
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(1 row)
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-- Most DMLs
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EXPLAIN (COSTS OFF) TABLE stats_track_tab\; EXPLAIN (COSTS OFF) (TABLE test_table);
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QUERY PLAN
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-----------------------------
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Seq Scan on stats_track_tab
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(1 row)
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|
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QUERY PLAN
|
|
------------------------
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Seq Scan on test_table
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(1 row)
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EXPLAIN (COSTS OFF) VALUES (1)\; EXPLAIN (COSTS OFF) (VALUES (1, 2));
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QUERY PLAN
|
|
------------
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Result
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(1 row)
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|
|
QUERY PLAN
|
|
------------
|
|
Result
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(1 row)
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|
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EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1\; EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1;
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QUERY PLAN
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|
-----------------------------------
|
|
Update on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
Filter: (x = 1)
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(3 rows)
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|
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Update on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
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|
(2 rows)
|
|
|
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EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab\; EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = 1;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Delete on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
(2 rows)
|
|
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Delete on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
Filter: (x = 1)
|
|
(3 rows)
|
|
|
|
EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1))\; EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (1), (2);
|
|
QUERY PLAN
|
|
---------------------------
|
|
Insert on stats_track_tab
|
|
-> Result
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|
(2 rows)
|
|
|
|
QUERY PLAN
|
|
---------------------------------
|
|
Insert on stats_track_tab
|
|
-> Values Scan on "*VALUES*"
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|
(2 rows)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+--------------------------------------------------------------------
|
|
f | 1 | DELETE FROM stats_track_tab
|
|
f | 1 | DELETE FROM stats_track_tab WHERE x = $1
|
|
t | 1 | EXPLAIN (COSTS OFF) (TABLE test_table)
|
|
t | 1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
|
|
t | 1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
|
|
t | 1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = $1
|
|
t | 1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ($1), ($2)
|
|
t | 1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
|
|
t | 1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
|
|
t | 1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1
|
|
t | 1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
|
|
t | 1 | EXPLAIN (COSTS OFF) VALUES ($1)
|
|
f | 1 | INSERT INTO stats_track_tab VALUES ($1), ($2)
|
|
f | 1 | INSERT INTO stats_track_tab VALUES (($1))
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
f | 1 | TABLE stats_track_tab
|
|
f | 1 | TABLE test_table
|
|
f | 1 | UPDATE stats_track_tab SET x = $1
|
|
f | 1 | UPDATE stats_track_tab SET x = $1 WHERE x = $2
|
|
f | 1 | VALUES ($1)
|
|
f | 1 | VALUES ($1, $2)
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|
(21 rows)
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|
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
-- MERGE, worth its own.
|
|
EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab
|
|
USING (SELECT id FROM generate_series(1, 10) id) ON x = id
|
|
WHEN MATCHED THEN UPDATE SET x = id
|
|
WHEN NOT MATCHED THEN INSERT (x) VALUES (id)\; EXPLAIN (COSTS OFF) SELECT 1, 2, 3, 4, 5;
|
|
QUERY PLAN
|
|
-------------------------------------------------------
|
|
Merge on stats_track_tab
|
|
-> Hash Right Join
|
|
Hash Cond: (stats_track_tab.x = id.id)
|
|
-> Seq Scan on stats_track_tab
|
|
-> Hash
|
|
-> Function Scan on generate_series id
|
|
(6 rows)
|
|
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------------
|
|
t | 1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab +
|
|
| | USING (SELECT id FROM generate_series($1, $2) id) ON x = id+
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
|
|
t | 1 | EXPLAIN (COSTS OFF) SELECT $1, $2, $3, $4, $5
|
|
f | 1 | MERGE INTO stats_track_tab +
|
|
| | USING (SELECT id FROM generate_series($1, $2) id) ON x = id+
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
|
|
f | 1 | SELECT $1, $2, $3, $4, $5
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(5 rows)
|
|
|
|
-- EXPLAIN - top-level tracking with multi-statement strings.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) SELECT 1\; EXPLAIN (COSTS OFF) SELECT 1, 2;
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) (SELECT 1, 2, 3)\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3, 4);
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) TABLE stats_track_tab\; EXPLAIN (COSTS OFF) (TABLE test_table);
|
|
QUERY PLAN
|
|
-----------------------------
|
|
Seq Scan on stats_track_tab
|
|
(1 row)
|
|
|
|
QUERY PLAN
|
|
------------------------
|
|
Seq Scan on test_table
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) VALUES (1)\; EXPLAIN (COSTS OFF) (VALUES (1, 2));
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1\; EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Update on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
Filter: (x = 1)
|
|
(3 rows)
|
|
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Update on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
(2 rows)
|
|
|
|
EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab\; EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = 1;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Delete on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
(2 rows)
|
|
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Delete on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
Filter: (x = 1)
|
|
(3 rows)
|
|
|
|
EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1))\; EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1), (2));
|
|
QUERY PLAN
|
|
---------------------------
|
|
Insert on stats_track_tab
|
|
-> Result
|
|
(2 rows)
|
|
|
|
ERROR: INSERT has more expressions than target columns
|
|
LINE 1: ...N (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1), (2));
|
|
^
|
|
EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab USING (SELECT id FROM generate_series(1, 10) id) ON x = id
|
|
WHEN MATCHED THEN UPDATE SET x = id
|
|
WHEN NOT MATCHED THEN INSERT (x) VALUES (id)\; EXPLAIN (COSTS OFF) SELECT 1, 2, 3, 4, 5;
|
|
QUERY PLAN
|
|
-------------------------------------------------------
|
|
Merge on stats_track_tab
|
|
-> Hash Right Join
|
|
Hash Cond: (stats_track_tab.x = id.id)
|
|
-> Seq Scan on stats_track_tab
|
|
-> Hash
|
|
-> Function Scan on generate_series id
|
|
(6 rows)
|
|
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) SELECT 1, 2 UNION SELECT 3, 4\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3) UNION SELECT 3, 4, 5;
|
|
QUERY PLAN
|
|
----------------------------
|
|
Unique
|
|
-> Sort
|
|
Sort Key: (1), (2)
|
|
-> Append
|
|
-> Result
|
|
-> Result
|
|
(6 rows)
|
|
|
|
QUERY PLAN
|
|
---------------------------------
|
|
Unique
|
|
-> Sort
|
|
Sort Key: (1), (2), (3)
|
|
-> Append
|
|
-> Result
|
|
-> Result
|
|
(6 rows)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+------------------------------------------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3)
|
|
t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3) UNION SELECT $4, $5, $6
|
|
t | 1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3, $4)
|
|
t | 1 | EXPLAIN (COSTS OFF) (TABLE test_table)
|
|
t | 1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
|
|
t | 1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
|
|
t | 1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = $1
|
|
t | 1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
|
|
t | 1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab USING (SELECT id FROM generate_series($1, $2) id) ON x = id+
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
|
|
t | 1 | EXPLAIN (COSTS OFF) SELECT $1
|
|
t | 1 | EXPLAIN (COSTS OFF) SELECT $1, $2
|
|
t | 1 | EXPLAIN (COSTS OFF) SELECT $1, $2 UNION SELECT $3, $4
|
|
t | 1 | EXPLAIN (COSTS OFF) SELECT $1, $2, $3, $4, $5
|
|
t | 1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
|
|
t | 1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1
|
|
t | 1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
|
|
t | 1 | EXPLAIN (COSTS OFF) VALUES ($1)
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(18 rows)
|
|
|
|
-- EXPLAIN with CTEs - all-level tracking
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) SELECT 1;
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) (WITH a AS (SELECT 4) (SELECT 1, 2));
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Update on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
Filter: (x = 1)
|
|
(3 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) DELETE FROM stats_track_tab;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Delete on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
(2 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) INSERT INTO stats_track_tab VALUES ((1));
|
|
QUERY PLAN
|
|
---------------------------
|
|
Insert on stats_track_tab
|
|
-> Result
|
|
(2 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) MERGE INTO stats_track_tab
|
|
USING (SELECT id FROM generate_series(1, 10) id) ON x = id
|
|
WHEN MATCHED THEN UPDATE SET x = id
|
|
WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
|
|
QUERY PLAN
|
|
-------------------------------------------------------
|
|
Merge on stats_track_tab
|
|
-> Hash Right Join
|
|
Hash Cond: (stats_track_tab.x = id.id)
|
|
-> Seq Scan on stats_track_tab
|
|
-> Hash
|
|
-> Function Scan on generate_series id
|
|
(6 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (select 4) SELECT 1 UNION SELECT 2;
|
|
QUERY PLAN
|
|
--------------------------
|
|
Unique
|
|
-> Sort
|
|
Sort Key: (1)
|
|
-> Append
|
|
-> Result
|
|
-> Result
|
|
(6 rows)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+------------------------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (COSTS OFF) (WITH a AS (SELECT $1) (SELECT $2, $3))
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) DELETE FROM stats_track_tab
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) INSERT INTO stats_track_tab VALUES (($2))
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) MERGE INTO stats_track_tab +
|
|
| | USING (SELECT id FROM generate_series($2, $3) id) ON x = id +
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) SELECT $2
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) UPDATE stats_track_tab SET x = $2 WHERE x = $3
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (select $1) SELECT $2 UNION SELECT $3
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
f | 1 | WITH a AS (SELECT $1) (SELECT $2, $3)
|
|
f | 1 | WITH a AS (SELECT $1) DELETE FROM stats_track_tab
|
|
f | 1 | WITH a AS (SELECT $1) INSERT INTO stats_track_tab VALUES (($2))
|
|
f | 1 | WITH a AS (SELECT $1) MERGE INTO stats_track_tab +
|
|
| | USING (SELECT id FROM generate_series($2, $3) id) ON x = id +
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
|
|
f | 1 | WITH a AS (SELECT $1) SELECT $2
|
|
f | 1 | WITH a AS (SELECT $1) UPDATE stats_track_tab SET x = $2 WHERE x = $3
|
|
f | 1 | WITH a AS (select $1) SELECT $2 UNION SELECT $3
|
|
(15 rows)
|
|
|
|
-- EXPLAIN with CTEs - top-level tracking
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) SELECT 1;
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) (WITH a AS (SELECT 4) (SELECT 1, 2));
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Update on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
Filter: (x = 1)
|
|
(3 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) DELETE FROM stats_track_tab;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Delete on stats_track_tab
|
|
-> Seq Scan on stats_track_tab
|
|
(2 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) INSERT INTO stats_track_tab VALUES ((1));
|
|
QUERY PLAN
|
|
---------------------------
|
|
Insert on stats_track_tab
|
|
-> Result
|
|
(2 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) MERGE INTO stats_track_tab
|
|
USING (SELECT id FROM generate_series(1, 10) id) ON x = id
|
|
WHEN MATCHED THEN UPDATE SET x = id
|
|
WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
|
|
QUERY PLAN
|
|
-------------------------------------------------------
|
|
Merge on stats_track_tab
|
|
-> Hash Right Join
|
|
Hash Cond: (stats_track_tab.x = id.id)
|
|
-> Seq Scan on stats_track_tab
|
|
-> Hash
|
|
-> Function Scan on generate_series id
|
|
(6 rows)
|
|
|
|
EXPLAIN (COSTS OFF) WITH a AS (select 4) SELECT 1 UNION SELECT 2;
|
|
QUERY PLAN
|
|
--------------------------
|
|
Unique
|
|
-> Sort
|
|
Sort Key: (1)
|
|
-> Append
|
|
-> Result
|
|
-> Result
|
|
(6 rows)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+------------------------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (COSTS OFF) (WITH a AS (SELECT $1) (SELECT $2, $3))
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) DELETE FROM stats_track_tab
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) INSERT INTO stats_track_tab VALUES (($2))
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) MERGE INTO stats_track_tab +
|
|
| | USING (SELECT id FROM generate_series($2, $3) id) ON x = id +
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) SELECT $2
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) UPDATE stats_track_tab SET x = $2 WHERE x = $3
|
|
t | 1 | EXPLAIN (COSTS OFF) WITH a AS (select $1) SELECT $2 UNION SELECT $3
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(8 rows)
|
|
|
|
-- Explain analyze, all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Result (actual rows=1.00 loops=1)
|
|
(1 row)
|
|
|
|
EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
|
|
DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
|
|
QUERY PLAN
|
|
--------------------------------------------------------
|
|
Seq Scan on stats_track_tab (actual rows=0.00 loops=1)
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+------------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) +
|
|
| | DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab
|
|
t | 1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT $1
|
|
f | 1 | SELECT $1
|
|
f | 1 | SELECT * FROM stats_track_tab
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(5 rows)
|
|
|
|
-- Explain analyze, top tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
|
|
QUERY PLAN
|
|
-----------------------------------
|
|
Result (actual rows=1.00 loops=1)
|
|
(1 row)
|
|
|
|
EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
|
|
DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
|
|
QUERY PLAN
|
|
--------------------------------------------------------
|
|
Seq Scan on stats_track_tab (actual rows=0.00 loops=1)
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+------------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) +
|
|
| | DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab
|
|
t | 1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT $1
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(3 rows)
|
|
|
|
-- Create Materialized View, all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
CREATE MATERIALIZED VIEW pgss_materialized_view AS
|
|
SELECT * FROM generate_series(1, 5) as id;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+----------------------------------------------------
|
|
t | 1 | CREATE MATERIALIZED VIEW pgss_materialized_view AS+
|
|
| | SELECT * FROM generate_series($1, $2) as id
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(2 rows)
|
|
|
|
-- CREATE MATERIALIZED VIEW, top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
CREATE MATERIALIZED VIEW pgss_materialized_view_2 AS
|
|
SELECT * FROM generate_series(1, 5) as id;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+------------------------------------------------------
|
|
t | 1 | CREATE MATERIALIZED VIEW pgss_materialized_view_2 AS+
|
|
| | SELECT * FROM generate_series($1, $2) as id
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(2 rows)
|
|
|
|
-- REFRESH MATERIALIZED VIEW, all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
REFRESH MATERIALIZED VIEW pgss_materialized_view;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+----------------------------------------------------
|
|
t | 1 | REFRESH MATERIALIZED VIEW pgss_materialized_view
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(2 rows)
|
|
|
|
-- REFRESH MATERIALIZED VIEW, top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
REFRESH MATERIALIZED VIEW pgss_materialized_view;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+----------------------------------------------------
|
|
t | 1 | REFRESH MATERIALIZED VIEW pgss_materialized_view
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(2 rows)
|
|
|
|
-- CREATE TABLE AS, all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
PREPARE test_prepare_pgss AS select generate_series(1, 10);
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
CREATE TEMPORARY TABLE pgss_ctas_1 AS SELECT 1;
|
|
CREATE TEMPORARY TABLE pgss_ctas_2 AS EXECUTE test_prepare_pgss;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+-----------------------------------------------------------------
|
|
t | 1 | CREATE TEMPORARY TABLE pgss_ctas_1 AS SELECT $1
|
|
t | 1 | CREATE TEMPORARY TABLE pgss_ctas_2 AS EXECUTE test_prepare_pgss
|
|
f | 1 | SELECT $1
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
f | 1 | select generate_series($1, $2)
|
|
(5 rows)
|
|
|
|
-- CREATE TABLE AS, top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
CREATE TEMPORARY TABLE pgss_ctas_3 AS SELECT 1;
|
|
CREATE TEMPORARY TABLE pgss_ctas_4 AS EXECUTE test_prepare_pgss;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+-----------------------------------------------------------------
|
|
t | 1 | CREATE TEMPORARY TABLE pgss_ctas_3 AS SELECT $1
|
|
t | 1 | CREATE TEMPORARY TABLE pgss_ctas_4 AS EXECUTE test_prepare_pgss
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(3 rows)
|
|
|
|
-- EXPLAIN with CREATE TABLE AS - all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT 1;
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT $1
|
|
f | 1 | SELECT $1
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(3 rows)
|
|
|
|
-- EXPLAIN with CREATE TABLE AS - top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT 1;
|
|
QUERY PLAN
|
|
------------
|
|
Result
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------------------------
|
|
t | 1 | EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT $1
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(2 rows)
|
|
|
|
-- DECLARE CURSOR, all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
BEGIN;
|
|
DECLARE FOOCUR CURSOR FOR SELECT * from stats_track_tab;
|
|
FETCH FORWARD 1 FROM foocur;
|
|
x
|
|
---
|
|
(0 rows)
|
|
|
|
CLOSE foocur;
|
|
COMMIT;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------
|
|
t | 1 | BEGIN
|
|
t | 1 | CLOSE foocur
|
|
t | 1 | COMMIT
|
|
t | 1 | DECLARE FOOCUR CURSOR FOR SELECT * from stats_track_tab
|
|
t | 1 | FETCH FORWARD 1 FROM foocur
|
|
f | 1 | SELECT * from stats_track_tab
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(7 rows)
|
|
|
|
-- DECLARE CURSOR, top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
BEGIN;
|
|
DECLARE FOOCUR CURSOR FOR SELECT * FROM stats_track_tab;
|
|
FETCH FORWARD 1 FROM foocur;
|
|
x
|
|
---
|
|
(0 rows)
|
|
|
|
CLOSE foocur;
|
|
COMMIT;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------
|
|
t | 1 | BEGIN
|
|
t | 1 | CLOSE foocur
|
|
t | 1 | COMMIT
|
|
t | 1 | DECLARE FOOCUR CURSOR FOR SELECT * FROM stats_track_tab
|
|
t | 1 | FETCH FORWARD 1 FROM foocur
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(6 rows)
|
|
|
|
-- COPY - all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
COPY (SELECT 1) TO stdout;
|
|
1
|
|
COPY (SELECT 1 UNION SELECT 2) TO stdout;
|
|
1
|
|
2
|
|
COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id
|
|
WHEN MATCHED THEN UPDATE SET x = id
|
|
WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout;
|
|
1
|
|
COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout;
|
|
1
|
|
COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout;
|
|
2
|
|
2
|
|
COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout;
|
|
2
|
|
2
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------------------------
|
|
t | 1 | COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout
|
|
t | 1 | COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout
|
|
t | 1 | COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id +
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout
|
|
t | 1 | COPY (SELECT 1 UNION SELECT 2) TO stdout
|
|
t | 1 | COPY (SELECT 1) TO stdout
|
|
t | 1 | COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout
|
|
f | 1 | DELETE FROM stats_track_tab WHERE x = $1 RETURNING x
|
|
f | 1 | INSERT INTO stats_track_tab (x) VALUES ($1) RETURNING x
|
|
f | 1 | MERGE INTO stats_track_tab USING (SELECT $1 id) ON x = id +
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x
|
|
f | 1 | SELECT $1
|
|
f | 1 | SELECT $1 UNION SELECT $2
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
f | 1 | UPDATE stats_track_tab SET x = $1 WHERE x = $2 RETURNING x
|
|
(13 rows)
|
|
|
|
-- COPY - top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
COPY (SELECT 1) TO stdout;
|
|
1
|
|
COPY (SELECT 1 UNION SELECT 2) TO stdout;
|
|
1
|
|
2
|
|
COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id
|
|
WHEN MATCHED THEN UPDATE SET x = id
|
|
WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout;
|
|
1
|
|
COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout;
|
|
1
|
|
COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout;
|
|
2
|
|
2
|
|
COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout;
|
|
2
|
|
2
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C";
|
|
toplevel | calls | query
|
|
----------+-------+---------------------------------------------------------------------------
|
|
t | 1 | COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout
|
|
t | 1 | COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout
|
|
t | 1 | COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id +
|
|
| | WHEN MATCHED THEN UPDATE SET x = id +
|
|
| | WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout
|
|
t | 1 | COPY (SELECT 1 UNION SELECT 2) TO stdout
|
|
t | 1 | COPY (SELECT 1) TO stdout
|
|
t | 1 | COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(7 rows)
|
|
|
|
-- DO block - top-level tracking without utility.
|
|
SET pg_stat_statements.track = 'top';
|
|
SET pg_stat_statements.track_utility = FALSE;
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
DELETE FROM stats_track_tab;
|
|
DO $$
|
|
BEGIN
|
|
DELETE FROM stats_track_tab;
|
|
END; $$;
|
|
DO LANGUAGE plpgsql $$
|
|
BEGIN
|
|
-- this is a SELECT
|
|
PERFORM 'hello world'::TEXT;
|
|
END; $$;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C", toplevel;
|
|
toplevel | calls | query
|
|
----------+-------+----------------------------------------------------
|
|
t | 1 | DELETE FROM stats_track_tab
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(2 rows)
|
|
|
|
-- DO block - all-level tracking without utility.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
DELETE FROM stats_track_tab;
|
|
DO $$
|
|
BEGIN
|
|
DELETE FROM stats_track_tab;
|
|
END; $$;
|
|
DO LANGUAGE plpgsql $$
|
|
BEGIN
|
|
-- this is a SELECT
|
|
PERFORM 'hello world'::TEXT;
|
|
END; $$;
|
|
SELECT toplevel, calls, query FROM pg_stat_statements
|
|
ORDER BY query COLLATE "C", toplevel;
|
|
toplevel | calls | query
|
|
----------+-------+----------------------------------------------------
|
|
f | 1 | DELETE FROM stats_track_tab
|
|
t | 1 | DELETE FROM stats_track_tab
|
|
f | 1 | SELECT $1::TEXT
|
|
t | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(4 rows)
|
|
|
|
-- PL/pgSQL function - top-level tracking.
|
|
SET pg_stat_statements.track = 'top';
|
|
SET pg_stat_statements.track_utility = FALSE;
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
|
|
DECLARE
|
|
r INTEGER;
|
|
BEGIN
|
|
SELECT (i + 1 + 1.0)::INTEGER INTO r;
|
|
RETURN r;
|
|
END; $$ LANGUAGE plpgsql;
|
|
SELECT PLUS_TWO(3);
|
|
plus_two
|
|
----------
|
|
5
|
|
(1 row)
|
|
|
|
SELECT PLUS_TWO(7);
|
|
plus_two
|
|
----------
|
|
9
|
|
(1 row)
|
|
|
|
-- SQL function --- use LIMIT to keep it from being inlined
|
|
CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
|
|
$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
|
|
SELECT PLUS_ONE(8);
|
|
plus_one
|
|
----------
|
|
9
|
|
(1 row)
|
|
|
|
SELECT PLUS_ONE(10);
|
|
plus_one
|
|
----------
|
|
11
|
|
(1 row)
|
|
|
|
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
|
|
calls | rows | query
|
|
-------+------+----------------------------------------------------
|
|
2 | 2 | SELECT PLUS_ONE($1)
|
|
2 | 2 | SELECT PLUS_TWO($1)
|
|
1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(3 rows)
|
|
|
|
-- immutable SQL function --- can be executed at plan time
|
|
CREATE FUNCTION PLUS_THREE(i INTEGER) RETURNS INTEGER AS
|
|
$$ SELECT i + 3 LIMIT 1 $$ IMMUTABLE LANGUAGE SQL;
|
|
SELECT PLUS_THREE(8);
|
|
plus_three
|
|
------------
|
|
11
|
|
(1 row)
|
|
|
|
SELECT PLUS_THREE(10);
|
|
plus_three
|
|
------------
|
|
13
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
|
|
toplevel | calls | rows | query
|
|
----------+-------+------+------------------------------------------------------------------------------
|
|
t | 2 | 2 | SELECT PLUS_ONE($1)
|
|
t | 2 | 2 | SELECT PLUS_THREE($1)
|
|
t | 2 | 2 | SELECT PLUS_TWO($1)
|
|
t | 1 | 3 | SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"
|
|
t | 1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(5 rows)
|
|
|
|
-- PL/pgSQL function - all-level tracking.
|
|
SET pg_stat_statements.track = 'all';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
-- we drop and recreate the functions to avoid any caching funnies
|
|
DROP FUNCTION PLUS_ONE(INTEGER);
|
|
DROP FUNCTION PLUS_TWO(INTEGER);
|
|
DROP FUNCTION PLUS_THREE(INTEGER);
|
|
-- PL/pgSQL function
|
|
CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
|
|
DECLARE
|
|
r INTEGER;
|
|
BEGIN
|
|
SELECT (i + 1 + 1.0)::INTEGER INTO r;
|
|
RETURN r;
|
|
END; $$ LANGUAGE plpgsql;
|
|
SELECT PLUS_TWO(-1);
|
|
plus_two
|
|
----------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT PLUS_TWO(2);
|
|
plus_two
|
|
----------
|
|
4
|
|
(1 row)
|
|
|
|
-- SQL function --- use LIMIT to keep it from being inlined
|
|
CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
|
|
$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
|
|
SELECT PLUS_ONE(3);
|
|
plus_one
|
|
----------
|
|
4
|
|
(1 row)
|
|
|
|
SELECT PLUS_ONE(1);
|
|
plus_one
|
|
----------
|
|
2
|
|
(1 row)
|
|
|
|
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
|
|
calls | rows | query
|
|
-------+------+----------------------------------------------------
|
|
2 | 2 | SELECT (i + $2 + $3)::INTEGER
|
|
2 | 2 | SELECT (i + $2)::INTEGER LIMIT $3
|
|
2 | 2 | SELECT PLUS_ONE($1)
|
|
2 | 2 | SELECT PLUS_TWO($1)
|
|
1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(5 rows)
|
|
|
|
-- immutable SQL function --- can be executed at plan time
|
|
CREATE FUNCTION PLUS_THREE(i INTEGER) RETURNS INTEGER AS
|
|
$$ SELECT i + 3 LIMIT 1 $$ IMMUTABLE LANGUAGE SQL;
|
|
SELECT PLUS_THREE(8);
|
|
plus_three
|
|
------------
|
|
11
|
|
(1 row)
|
|
|
|
SELECT PLUS_THREE(10);
|
|
plus_three
|
|
------------
|
|
13
|
|
(1 row)
|
|
|
|
SELECT toplevel, calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
|
|
toplevel | calls | rows | query
|
|
----------+-------+------+------------------------------------------------------------------------------
|
|
f | 2 | 2 | SELECT (i + $2 + $3)::INTEGER
|
|
f | 2 | 2 | SELECT (i + $2)::INTEGER LIMIT $3
|
|
t | 2 | 2 | SELECT PLUS_ONE($1)
|
|
t | 2 | 2 | SELECT PLUS_THREE($1)
|
|
t | 2 | 2 | SELECT PLUS_TWO($1)
|
|
t | 1 | 5 | SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"
|
|
f | 2 | 2 | SELECT i + $2 LIMIT $3
|
|
t | 1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
|
|
(8 rows)
|
|
|
|
--
|
|
-- pg_stat_statements.track = none
|
|
--
|
|
SET pg_stat_statements.track = 'none';
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
SELECT 1 AS "one";
|
|
one
|
|
-----
|
|
1
|
|
(1 row)
|
|
|
|
SELECT 1 + 1 AS "two";
|
|
two
|
|
-----
|
|
2
|
|
(1 row)
|
|
|
|
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
|
|
calls | rows | query
|
|
-------+------+-------
|
|
(0 rows)
|
|
|
|
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
|
|
t
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
|