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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
83 lines
2.6 KiB
SQL
83 lines
2.6 KiB
SQL
/* contrib/pg_stat_statements/pg_stat_statements--1.10--1.11.sql */
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-- complain if script is sourced in psql, rather than via ALTER EXTENSION
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\echo Use "ALTER EXTENSION pg_stat_statements UPDATE TO '1.11'" to load this file. \quit
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/* Drop old versions */
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DROP VIEW pg_stat_statements;
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DROP FUNCTION pg_stat_statements(boolean);
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DROP FUNCTION pg_stat_statements_reset(Oid, Oid, bigint);
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/* Now redefine */
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CREATE FUNCTION pg_stat_statements(IN showtext boolean,
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OUT userid oid,
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OUT dbid oid,
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OUT toplevel bool,
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OUT queryid bigint,
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OUT query text,
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OUT plans int8,
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OUT total_plan_time float8,
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OUT min_plan_time float8,
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OUT max_plan_time float8,
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OUT mean_plan_time float8,
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OUT stddev_plan_time float8,
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OUT calls int8,
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OUT total_exec_time float8,
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OUT min_exec_time float8,
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OUT max_exec_time float8,
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OUT mean_exec_time float8,
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OUT stddev_exec_time float8,
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OUT rows int8,
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OUT shared_blks_hit int8,
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OUT shared_blks_read int8,
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OUT shared_blks_dirtied int8,
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OUT shared_blks_written int8,
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OUT local_blks_hit int8,
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OUT local_blks_read int8,
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OUT local_blks_dirtied int8,
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OUT local_blks_written int8,
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OUT temp_blks_read int8,
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OUT temp_blks_written int8,
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OUT shared_blk_read_time float8,
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OUT shared_blk_write_time float8,
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OUT local_blk_read_time float8,
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OUT local_blk_write_time float8,
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OUT temp_blk_read_time float8,
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OUT temp_blk_write_time float8,
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OUT wal_records int8,
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OUT wal_fpi int8,
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OUT wal_bytes numeric,
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OUT jit_functions int8,
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OUT jit_generation_time float8,
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OUT jit_inlining_count int8,
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OUT jit_inlining_time float8,
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OUT jit_optimization_count int8,
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OUT jit_optimization_time float8,
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OUT jit_emission_count int8,
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OUT jit_emission_time float8,
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OUT jit_deform_count int8,
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OUT jit_deform_time float8,
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OUT stats_since timestamp with time zone,
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OUT minmax_stats_since timestamp with time zone
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)
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RETURNS SETOF record
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AS 'MODULE_PATHNAME', 'pg_stat_statements_1_11'
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LANGUAGE C STRICT VOLATILE PARALLEL SAFE;
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CREATE VIEW pg_stat_statements AS
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SELECT * FROM pg_stat_statements(true);
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GRANT SELECT ON pg_stat_statements TO PUBLIC;
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CREATE FUNCTION pg_stat_statements_reset(IN userid Oid DEFAULT 0,
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IN dbid Oid DEFAULT 0,
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IN queryid bigint DEFAULT 0,
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IN minmax_only boolean DEFAULT false
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)
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RETURNS timestamp with time zone
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AS 'MODULE_PATHNAME', 'pg_stat_statements_reset_1_11'
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LANGUAGE C STRICT PARALLEL SAFE;
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-- Don't want this to be available to non-superusers.
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REVOKE ALL ON FUNCTION pg_stat_statements_reset(Oid, Oid, bigint, boolean) FROM PUBLIC;
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