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pgstat: add/extend tests for resetting various kinds of stats.

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- subscriber stats reset path was untested
- slot stat sreset path for all slots was untested
- pg_stat_database.sessions etc was untested
- pg_stat_reset_shared() was untested, for any kind of shared stats
- pg_stat_reset() was untested

Author: Melanie Plageman <melanieplageman@gmail.com>
Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20220303021600.hs34ghqcw6zcokdh@alap3.anarazel.de
This commit is contained in:
Andres Freund
2022-04-07 15:17:07 -07:00
parent 10a8d13823
commit 5264add784
7 changed files with 656 additions and 103 deletions
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32
contrib/test_decoding/sql/stats.sql
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@ -1,27 +1,41 @@
-- predictability
SET synchronous_commit = on;
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_stats', 'test_decoding');
SELECT 'init' FROM
pg_create_logical_replication_slot('regression_slot_stats1', 'test_decoding') s1,
pg_create_logical_replication_slot('regression_slot_stats2', 'test_decoding') s2,
pg_create_logical_replication_slot('regression_slot_stats3', 'test_decoding') s3;
CREATE TABLE stats_test(data text);
-- non-spilled xact
SET logical_decoding_work_mem to '64MB';
INSERT INTO stats_test values(1);
SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats', NULL, NULL, 'skip-empty-xacts', '1');
SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats1', NULL, NULL, 'skip-empty-xacts', '1');
SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats2', NULL, NULL, 'skip-empty-xacts', '1');
SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats3', NULL, NULL, 'skip-empty-xacts', '1');
SELECT pg_stat_force_next_flush();
SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
RESET logical_decoding_work_mem;
-- reset the slot stats
SELECT pg_stat_reset_replication_slot('regression_slot_stats');
SELECT slot_name, spill_txns, spill_count, total_txns, total_bytes FROM pg_stat_replication_slots;
-- reset stats for one slot, others should be unaffected
SELECT pg_stat_reset_replication_slot('regression_slot_stats1');
SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
-- reset stats for all slots
SELECT pg_stat_reset_replication_slot(NULL);
SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
-- verify accessing/resetting stats for non-existent slot does something reasonable
SELECT * FROM pg_stat_get_replication_slot('do-not-exist');
SELECT pg_stat_reset_replication_slot('do-not-exist');
SELECT * FROM pg_stat_get_replication_slot('do-not-exist');
-- spilling the xact
BEGIN;
INSERT INTO stats_test SELECT 'serialize-topbig--1:'||g.i FROM generate_series(1, 5000) g(i);
COMMIT;
SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot_stats', NULL, NULL, 'skip-empty-xacts', '1');
SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot_stats1', NULL, NULL, 'skip-empty-xacts', '1');
-- Check stats. We can't test the exact stats count as that can vary if any
-- background transaction (say by autovacuum) happens in parallel to the main
@ -37,4 +51,6 @@ SELECT slot_name FROM pg_stat_replication_slots;
COMMIT;
DROP TABLE stats_test;
SELECT pg_drop_replication_slot('regression_slot_stats');
SELECT pg_drop_replication_slot('regression_slot_stats1'),
pg_drop_replication_slot('regression_slot_stats2'),
pg_drop_replication_slot('regression_slot_stats3');