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-- predictability
SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_stats', 'test_decoding');
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?column?
----------
init
(1 row)
CREATE TABLE stats_test(data text);
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-- non-spilled xact
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SET logical_decoding_work_mem to '64MB';
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INSERT INTO stats_test values(1);
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SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats', NULL, NULL, 'skip-empty-xacts', '1');
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count
-------
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3
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(1 row)
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SELECT pg_stat_force_next_flush();
pg_stat_force_next_flush
--------------------------
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(1 row)
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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;
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slot_name | spill_txns | spill_count | total_txns | total_bytes
-----------------------+------------+-------------+------------+-------------
regression_slot_stats | t | t | t | t
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(1 row)
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RESET logical_decoding_work_mem;
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-- reset the slot stats
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SELECT pg_stat_reset_replication_slot('regression_slot_stats');
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pg_stat_reset_replication_slot
--------------------------------
(1 row)
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SELECT slot_name, spill_txns, spill_count, total_txns, total_bytes FROM pg_stat_replication_slots;
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slot_name | spill_txns | spill_count | total_txns | total_bytes
-----------------------+------------+-------------+------------+-------------
regression_slot_stats | 0 | 0 | 0 | 0
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(1 row)
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-- spilling the xact
BEGIN;
INSERT INTO stats_test SELECT 'serialize-topbig--1:'||g.i FROM generate_series(1, 5000) g(i);
COMMIT;
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SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot_stats', NULL, NULL, 'skip-empty-xacts', '1');
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count
-------
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5002
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(1 row)
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-- 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
-- transaction.
SELECT pg_stat_force_next_flush();
pg_stat_force_next_flush
--------------------------
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(1 row)
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SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
slot_name | spill_txns | spill_count
-----------------------+------------+-------------
regression_slot_stats | t | t
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(1 row)
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-- Ensure stats can be repeatedly accessed using the same stats snapshot. See
-- https://postgr.es/m/20210317230447.c7uc4g3vbs4wi32i%40alap3.anarazel.de
BEGIN;
SELECT slot_name FROM pg_stat_replication_slots;
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slot_name
-----------------------
regression_slot_stats
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(1 row)
SELECT slot_name FROM pg_stat_replication_slots;
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slot_name
-----------------------
regression_slot_stats
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(1 row)
COMMIT;
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DROP TABLE stats_test;
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SELECT pg_drop_replication_slot('regression_slot_stats');
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pg_drop_replication_slot
--------------------------
(1 row)