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This patch adds 'stats_since' and 'minmax_stats_since' columns to the pg_stat_statements view and pg_stat_statements() function. The new min/max reset mode for the pg_stat_stetments_reset() function is controlled by the parameter minmax_only. 'stat_since' column is populated with the current timestamp when a new statement is added to the pg_stat_statements hashtable. It provides clean information about statistics collection time intervals for each statement. Besides it can be used by sampling solutions to detect situations when a statement was evicted and stored again between samples. Such a sampling solution could derive any pg_stat_statements statistic values for an interval between two samples with the exception of all min/max statistics. To address this issue this patch adds the ability to reset min/max statistics independently of the statement reset using the new minmax_only parameter of the pg_stat_statements_reset(userid oid, dbid oid, queryid bigint, minmax_only boolean) function. The timestamp of such reset is stored in the minmax_stats_since field for each statement. pg_stat_statements_reset() function now returns the timestamp of a reset as the result. Discussion: https://postgr.es/m/flat/72e80e7b160a6eb189df9ef6f068cce3765d37f8.camel%40moonset.ru Author: Andrei Zubkov Reviewed-by: Julien Rouhaud, Hayato Kuroda, Yuki Seino, Chengxi Sun Reviewed-by: Anton Melnikov, Darren Rush, Michael Paquier, Sergei Kornilov Reviewed-by: Alena Rybakina, Andrei Lepikhov
59 lines
2.2 KiB
SQL
59 lines
2.2 KiB
SQL
-- test old extension version entry points
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CREATE EXTENSION pg_stat_statements WITH VERSION '1.4';
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-- Execution of pg_stat_statements_reset() is granted only to
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-- superusers in 1.4, so this fails.
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SET SESSION AUTHORIZATION pg_read_all_stats;
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SELECT pg_stat_statements_reset();
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RESET SESSION AUTHORIZATION;
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.5';
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-- Execution of pg_stat_statements_reset() should be granted to
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-- pg_read_all_stats now, so this works.
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SET SESSION AUTHORIZATION pg_read_all_stats;
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SELECT pg_stat_statements_reset();
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RESET SESSION AUTHORIZATION;
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-- In 1.6, it got restricted back to superusers.
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.6';
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SET SESSION AUTHORIZATION pg_read_all_stats;
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SELECT pg_stat_statements_reset();
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RESET SESSION AUTHORIZATION;
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SELECT pg_get_functiondef('pg_stat_statements_reset'::regproc);
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-- New function for pg_stat_statements_reset introduced, still
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-- restricted for non-superusers.
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.7';
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SET SESSION AUTHORIZATION pg_read_all_stats;
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SELECT pg_stat_statements_reset();
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RESET SESSION AUTHORIZATION;
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SELECT pg_get_functiondef('pg_stat_statements_reset'::regproc);
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\d pg_stat_statements
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SELECT count(*) > 0 AS has_data FROM pg_stat_statements;
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-- New functions and views for pg_stat_statements in 1.8
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.8';
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\d pg_stat_statements
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SELECT pg_get_functiondef('pg_stat_statements_reset'::regproc);
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-- New function pg_stat_statement_info, and new function
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-- and view for pg_stat_statements introduced in 1.9
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.9';
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SELECT pg_get_functiondef('pg_stat_statements_info'::regproc);
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\d pg_stat_statements
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SELECT count(*) > 0 AS has_data FROM pg_stat_statements;
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-- New functions and views for pg_stat_statements in 1.10
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.10';
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\d pg_stat_statements
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SELECT count(*) > 0 AS has_data FROM pg_stat_statements;
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-- New functions and views for pg_stat_statements in 1.11
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AlTER EXTENSION pg_stat_statements UPDATE TO '1.11';
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\d pg_stat_statements
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SELECT count(*) > 0 AS has_data FROM pg_stat_statements;
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-- New parameter minmax_only of pg_stat_statements_reset function
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SELECT pg_get_functiondef('pg_stat_statements_reset'::regproc);
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DROP EXTENSION pg_stat_statements;
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