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Alexander Korotkov dc9f8a7983 Track statement entry timestamp in contrib/pg_stat_statements ... 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		2 years ago
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cleanup.out	Refactor tests of pg_stat_statements for planning, utility and level tracking	3 years ago
cursors.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
dml.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
entry_timestamp.out	Track statement entry timestamp in contrib/pg_stat_statements	2 years ago
level_tracking.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
oldextversions.out	Track statement entry timestamp in contrib/pg_stat_statements	2 years ago
planning.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
select.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
user_activity.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
utility.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago
wal.out	Add NOT NULL checking of pg_stat_statements_reset() in tests	2 years ago