mirror of https://github.com/postgres/postgres
pg_stat_statements.sql acts as the main file for all the core tests of the module, but things have become complicated to follow over the years as some of the sub-scenarios tested in this file rely on assumptions that come from completely different areas of it, like a GUC setup or a relation created previously. For example, row tracking for CTAS/COPY was looking at the number of plans, which was not necessary, or level tracking was mixed with checks on planner counts. This commit refactors the tests of pg_stat_statements, by moving test cases out of pg_stat_statements.sql into their own file, as of: - Planning-related tests in planning.sql, for [re]plan counts and top-level handling. These depend on pg_stat_statements.track_planning. - Utilities in utility.sql (pg_stat_statements.track_utility), that includes now the tests for: -- Row tracking for CTAS, CREATE MATERIALIZED VIEW, COPY. -- Basic utility statements. -- SET statements. - Tracking level, depending on pg_stat_statements.track. This part has been looking at scenarios with DO blocks, PL functions and SQL functions. pg_stat_statements.sql (still named the same for now) still includes some checks for role-level tracking and WAL generation metrics, that ought to become independent in the long term for clarity. While on it, this switches the order of the attributes when querying pg_stat_statements, the query field becoming last. This makes much easier the tracking of changes related to normalization, as queries are the only variable-length attributes queried (unaligned mode would be one extra choice, but that reduces the checks on the other fields). Test scenarios and their results match exactly with what was happening before this commit in terms of calls, number of plans, number of rows, cached data or level tracking, so this has no effect on the coverage in terms of what is produced by the reports in the table pg_stat_statements. A follow-up patch will extend more the tests of pg_stat_statements around utilities, so this split creates a foundation for this purpose, without complicating more pg_stat_statements.sql. Reviewed-by: Bertrand Drouvot Discussion: https://postgr.es/m/Y+MRdEq9W9XVa2AB@paquier.xyzpull/130/head
Michael Paquier
2 years ago
parent
e72910f808
commit
e8dbdb15db
@ -0,0 +1 @@ |
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DROP EXTENSION pg_stat_statements; |
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@ -0,0 +1,204 @@ |
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-- |
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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(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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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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|
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SELECT pg_stat_statements_reset(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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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() |
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t | 1 | SET pg_stat_statements.track = 'all' |
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(7 rows) |
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|
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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(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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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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plus_two |
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---------- |
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5 |
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(1 row) |
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|
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SELECT PLUS_TWO(7); |
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plus_two |
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---------- |
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9 |
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(1 row) |
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|
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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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plus_one |
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---------- |
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9 |
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(1 row) |
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|
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SELECT PLUS_ONE(10); |
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plus_one |
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---------- |
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11 |
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(1 row) |
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|
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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calls | rows | query |
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-------+------+----------------------------------- |
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2 | 2 | SELECT PLUS_ONE($1) |
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2 | 2 | SELECT PLUS_TWO($1) |
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1 | 1 | SELECT pg_stat_statements_reset() |
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(3 rows) |
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|
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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(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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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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-- 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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plus_two |
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---------- |
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1 |
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(1 row) |
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|
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SELECT PLUS_TWO(2); |
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plus_two |
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---------- |
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4 |
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(1 row) |
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|
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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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plus_one |
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---------- |
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4 |
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(1 row) |
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|
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SELECT PLUS_ONE(1); |
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plus_one |
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---------- |
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2 |
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(1 row) |
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|
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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calls | rows | query |
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-------+------+----------------------------------- |
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2 | 2 | SELECT (i + $2 + $3)::INTEGER |
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2 | 2 | SELECT (i + $2)::INTEGER LIMIT $3 |
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2 | 2 | SELECT PLUS_ONE($1) |
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2 | 2 | SELECT PLUS_TWO($1) |
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1 | 1 | SELECT pg_stat_statements_reset() |
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(5 rows) |
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|
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DROP FUNCTION PLUS_ONE(INTEGER); |
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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(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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SELECT 1 AS "one"; |
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one |
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----- |
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1 |
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(1 row) |
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|
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SELECT 1 + 1 AS "two"; |
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two |
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----- |
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2 |
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(1 row) |
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|
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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calls | rows | query |
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-------+------+------- |
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(0 rows) |
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|
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@ -0,0 +1,88 @@ |
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-- |
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-- Information related to planning |
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-- |
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-- These tests require track_planning to be enabled. |
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SET pg_stat_statements.track_planning = TRUE; |
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SELECT pg_stat_statements_reset(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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-- |
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-- [re]plan counting |
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-- |
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CREATE TABLE stats_plan_test (); |
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PREPARE prep1 AS SELECT COUNT(*) FROM stats_plan_test; |
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EXECUTE prep1; |
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count |
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------- |
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0 |
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(1 row) |
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|
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EXECUTE prep1; |
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count |
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------- |
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0 |
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(1 row) |
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|
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EXECUTE prep1; |
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count |
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------- |
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0 |
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(1 row) |
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|
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ALTER TABLE stats_plan_test ADD COLUMN x int; |
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EXECUTE prep1; |
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count |
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------- |
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0 |
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(1 row) |
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|
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SELECT 42; |
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?column? |
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---------- |
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42 |
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(1 row) |
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|
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SELECT 42; |
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?column? |
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---------- |
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42 |
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(1 row) |
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|
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SELECT 42; |
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?column? |
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---------- |
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42 |
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(1 row) |
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|
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SELECT plans, calls, rows, query FROM pg_stat_statements |
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WHERE query NOT LIKE 'PREPARE%' ORDER BY query COLLATE "C"; |
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plans | calls | rows | query |
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-------+-------+------+---------------------------------------------------------- |
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0 | 1 | 0 | ALTER TABLE stats_plan_test ADD COLUMN x int |
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0 | 1 | 0 | CREATE TABLE stats_plan_test () |
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3 | 3 | 3 | SELECT $1 |
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0 | 1 | 1 | SELECT pg_stat_statements_reset() |
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1 | 0 | 0 | SELECT plans, calls, rows, query FROM pg_stat_statements+ |
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| | | WHERE query NOT LIKE $1 ORDER BY query COLLATE "C" |
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(5 rows) |
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|
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-- for the prepared statement we expect at least one replan, but cache |
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-- invalidations could force more |
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SELECT plans >= 2 AND plans <= calls AS plans_ok, calls, rows, query FROM pg_stat_statements |
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WHERE query LIKE 'PREPARE%' ORDER BY query COLLATE "C"; |
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plans_ok | calls | rows | query |
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----------+-------+------+------------------------------------------------------- |
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t | 4 | 4 | PREPARE prep1 AS SELECT COUNT(*) FROM stats_plan_test |
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(1 row) |
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|
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-- Cleanup |
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DROP TABLE stats_plan_test; |
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SELECT pg_stat_statements_reset(); |
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pg_stat_statements_reset |
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-------------------------- |
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(1 row) |
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@ -0,0 +1,132 @@ |
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-- |
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-- Utility commands |
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-- |
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-- These tests require track_utility to be enabled. |
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SET pg_stat_statements.track_utility = TRUE; |
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SELECT pg_stat_statements_reset(); |
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pg_stat_statements_reset |
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-------------------------- |
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|
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(1 row) |
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|
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SELECT 1; |
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?column? |
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---------- |
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1 |
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(1 row) |
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CREATE TEMP TABLE stats_util_tab (a int, b char(20)); |
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CREATE INDEX test_b ON stats_util_tab(b); |
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DROP TABLE stats_util_tab \; |
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DROP TABLE IF EXISTS stats_util_tab; |
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NOTICE: table "stats_util_tab" does not exist, skipping |
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-- This DROP query uses two different strings, still they count as one entry. |
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DROP TABLE IF EXISTS stats_util_tab \; |
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Drop Table If Exists stats_util_tab; |
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NOTICE: table "stats_util_tab" does not exist, skipping |
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NOTICE: table "stats_util_tab" does not exist, skipping |
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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calls | rows | query |
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-------+------+------------------------------------------------------ |
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1 | 0 | CREATE INDEX test_b ON stats_util_tab(b) |
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1 | 0 | CREATE TEMP TABLE stats_util_tab (a int, b char(20)) |
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3 | 0 | DROP TABLE IF EXISTS stats_util_tab |
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1 | 0 | DROP TABLE stats_util_tab |
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1 | 1 | SELECT $1 |
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1 | 1 | SELECT pg_stat_statements_reset() |
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(6 rows) |
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SELECT pg_stat_statements_reset(); |
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pg_stat_statements_reset |
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-------------------------- |
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(1 row) |
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-- |
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-- Track the total number of rows retrieved or affected by the utility |
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-- commands of COPY, FETCH, CREATE TABLE AS, CREATE MATERIALIZED VIEW, |
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-- REFRESH MATERIALIZED VIEW and SELECT INTO |
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-- |
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CREATE TABLE pgss_ctas AS SELECT a, 'ctas' b FROM generate_series(1, 10) a; |
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SELECT generate_series(1, 10) c INTO pgss_select_into; |
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COPY pgss_ctas (a, b) FROM STDIN; |
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CREATE MATERIALIZED VIEW pgss_matv AS SELECT * FROM pgss_ctas; |
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REFRESH MATERIALIZED VIEW pgss_matv; |
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BEGIN; |
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DECLARE pgss_cursor CURSOR FOR SELECT * FROM pgss_matv; |
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FETCH NEXT pgss_cursor; |
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a | b |
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---+------ |
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1 | ctas |
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(1 row) |
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FETCH FORWARD 5 pgss_cursor; |
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a | b |
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---+------ |
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2 | ctas |
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3 | ctas |
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4 | ctas |
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5 | ctas |
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6 | ctas |
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(5 rows) |
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FETCH FORWARD ALL pgss_cursor; |
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a | b |
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----+------ |
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7 | ctas |
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8 | ctas |
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9 | ctas |
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10 | ctas |
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11 | copy |
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12 | copy |
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13 | copy |
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(7 rows) |
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|
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COMMIT; |
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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calls | rows | query |
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-------+------+---------------------------------------------------------------------------- |
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1 | 0 | BEGIN |
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1 | 0 | COMMIT |
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1 | 3 | COPY pgss_ctas (a, b) FROM STDIN |
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1 | 13 | CREATE MATERIALIZED VIEW pgss_matv AS SELECT * FROM pgss_ctas |
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1 | 10 | CREATE TABLE pgss_ctas AS SELECT a, 'ctas' b FROM generate_series(1, 10) a |
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1 | 0 | DECLARE pgss_cursor CURSOR FOR SELECT * FROM pgss_matv |
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1 | 5 | FETCH FORWARD 5 pgss_cursor |
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1 | 7 | FETCH FORWARD ALL pgss_cursor |
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1 | 1 | FETCH NEXT pgss_cursor |
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1 | 13 | REFRESH MATERIALIZED VIEW pgss_matv |
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1 | 10 | SELECT generate_series(1, 10) c INTO pgss_select_into |
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1 | 1 | SELECT pg_stat_statements_reset() |
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(12 rows) |
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DROP MATERIALIZED VIEW pgss_matv; |
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DROP TABLE pgss_ctas; |
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DROP TABLE pgss_select_into; |
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SELECT pg_stat_statements_reset(); |
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pg_stat_statements_reset |
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-------------------------- |
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(1 row) |
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-- SET statements. |
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-- These use two different strings, still they count as one entry. |
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SET work_mem = '1MB'; |
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Set work_mem = '1MB'; |
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SET work_mem = '2MB'; |
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RESET work_mem; |
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SET enable_seqscan = off; |
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SET enable_seqscan = on; |
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RESET enable_seqscan; |
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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calls | rows | query |
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-------+------+----------------------------------- |
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1 | 0 | RESET enable_seqscan |
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1 | 0 | RESET work_mem |
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1 | 1 | SELECT pg_stat_statements_reset() |
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1 | 0 | SET enable_seqscan = off |
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1 | 0 | SET enable_seqscan = on |
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2 | 0 | SET work_mem = '1MB' |
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1 | 0 | SET work_mem = '2MB' |
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(7 rows) |
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@ -0,0 +1 @@ |
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DROP EXTENSION pg_stat_statements; |
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@ -0,0 +1,99 @@ |
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-- |
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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(); |
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|
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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(); |
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|
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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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|
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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(); |
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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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|
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SELECT PLUS_TWO(3); |
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SELECT PLUS_TWO(7); |
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|
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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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|
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SELECT PLUS_ONE(8); |
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SELECT PLUS_ONE(10); |
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|
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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|
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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(); |
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|
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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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|
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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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|
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SELECT PLUS_TWO(-1); |
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SELECT PLUS_TWO(2); |
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|
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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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|
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SELECT PLUS_ONE(3); |
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SELECT PLUS_ONE(1); |
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|
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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DROP FUNCTION PLUS_ONE(INTEGER); |
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|
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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(); |
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|
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SELECT 1 AS "one"; |
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SELECT 1 + 1 AS "two"; |
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|
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SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
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@ -0,0 +1,31 @@ |
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-- |
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-- Information related to planning |
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-- |
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|
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-- These tests require track_planning to be enabled. |
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SET pg_stat_statements.track_planning = TRUE; |
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SELECT pg_stat_statements_reset(); |
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|
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-- |
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-- [re]plan counting |
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-- |
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CREATE TABLE stats_plan_test (); |
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PREPARE prep1 AS SELECT COUNT(*) FROM stats_plan_test; |
||||
EXECUTE prep1; |
||||
EXECUTE prep1; |
||||
EXECUTE prep1; |
||||
ALTER TABLE stats_plan_test ADD COLUMN x int; |
||||
EXECUTE prep1; |
||||
SELECT 42; |
||||
SELECT 42; |
||||
SELECT 42; |
||||
SELECT plans, calls, rows, query FROM pg_stat_statements |
||||
WHERE query NOT LIKE 'PREPARE%' ORDER BY query COLLATE "C"; |
||||
-- for the prepared statement we expect at least one replan, but cache |
||||
-- invalidations could force more |
||||
SELECT plans >= 2 AND plans <= calls AS plans_ok, calls, rows, query FROM pg_stat_statements |
||||
WHERE query LIKE 'PREPARE%' ORDER BY query COLLATE "C"; |
||||
|
||||
-- Cleanup |
||||
DROP TABLE stats_plan_test; |
||||
SELECT pg_stat_statements_reset(); |
||||
@ -0,0 +1,60 @@ |
||||
-- |
||||
-- Utility commands |
||||
-- |
||||
|
||||
-- These tests require track_utility to be enabled. |
||||
SET pg_stat_statements.track_utility = TRUE; |
||||
SELECT pg_stat_statements_reset(); |
||||
|
||||
SELECT 1; |
||||
CREATE TEMP TABLE stats_util_tab (a int, b char(20)); |
||||
CREATE INDEX test_b ON stats_util_tab(b); |
||||
DROP TABLE stats_util_tab \; |
||||
DROP TABLE IF EXISTS stats_util_tab; |
||||
-- This DROP query uses two different strings, still they count as one entry. |
||||
DROP TABLE IF EXISTS stats_util_tab \; |
||||
Drop Table If Exists stats_util_tab; |
||||
|
||||
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
||||
SELECT pg_stat_statements_reset(); |
||||
|
||||
-- |
||||
-- Track the total number of rows retrieved or affected by the utility |
||||
-- commands of COPY, FETCH, CREATE TABLE AS, CREATE MATERIALIZED VIEW, |
||||
-- REFRESH MATERIALIZED VIEW and SELECT INTO |
||||
-- |
||||
CREATE TABLE pgss_ctas AS SELECT a, 'ctas' b FROM generate_series(1, 10) a; |
||||
SELECT generate_series(1, 10) c INTO pgss_select_into; |
||||
COPY pgss_ctas (a, b) FROM STDIN; |
||||
11 copy |
||||
12 copy |
||||
13 copy |
||||
\. |
||||
CREATE MATERIALIZED VIEW pgss_matv AS SELECT * FROM pgss_ctas; |
||||
REFRESH MATERIALIZED VIEW pgss_matv; |
||||
BEGIN; |
||||
DECLARE pgss_cursor CURSOR FOR SELECT * FROM pgss_matv; |
||||
FETCH NEXT pgss_cursor; |
||||
FETCH FORWARD 5 pgss_cursor; |
||||
FETCH FORWARD ALL pgss_cursor; |
||||
COMMIT; |
||||
|
||||
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
||||
|
||||
DROP MATERIALIZED VIEW pgss_matv; |
||||
DROP TABLE pgss_ctas; |
||||
DROP TABLE pgss_select_into; |
||||
|
||||
SELECT pg_stat_statements_reset(); |
||||
|
||||
-- SET statements. |
||||
-- These use two different strings, still they count as one entry. |
||||
SET work_mem = '1MB'; |
||||
Set work_mem = '1MB'; |
||||
SET work_mem = '2MB'; |
||||
RESET work_mem; |
||||
SET enable_seqscan = off; |
||||
SET enable_seqscan = on; |
||||
RESET enable_seqscan; |
||||
|
||||
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"; |
||||
Loading…
Reference in new issue