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6ab1dbd26b
This is preliminary patch. It adds NOT NULL checking for the result of pg_stat_statements_reset() function. It is needed for upcoming patch "Track statement entry timestamp" that will change the result type of this function to the timestamp of a reset performed. 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
31 lines
1.5 KiB
Plaintext
31 lines
1.5 KiB
Plaintext
--
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-- Validate WAL generation metrics
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--
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SET pg_stat_statements.track_utility = FALSE;
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CREATE TABLE pgss_wal_tab (a int, b char(20));
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INSERT INTO pgss_wal_tab VALUES(generate_series(1, 10), 'aaa');
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UPDATE pgss_wal_tab SET b = 'bbb' WHERE a > 7;
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DELETE FROM pgss_wal_tab WHERE a > 9;
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DROP TABLE pgss_wal_tab;
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-- Check WAL is generated for the above statements
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SELECT query, calls, rows,
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wal_bytes > 0 as wal_bytes_generated,
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wal_records > 0 as wal_records_generated,
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wal_records >= rows as wal_records_ge_rows
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FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows | wal_bytes_generated | wal_records_generated | wal_records_ge_rows
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--------------------------------------------------------------+-------+------+---------------------+-----------------------+---------------------
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DELETE FROM pgss_wal_tab WHERE a > $1 | 1 | 1 | t | t | t
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INSERT INTO pgss_wal_tab VALUES(generate_series($1, $2), $3) | 1 | 10 | t | t | t
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SELECT pg_stat_statements_reset() IS NOT NULL AS t | 1 | 1 | f | f | f
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SET pg_stat_statements.track_utility = FALSE | 1 | 0 | f | f | t
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UPDATE pgss_wal_tab SET b = $1 WHERE a > $2 | 1 | 3 | t | t | t
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(5 rows)
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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t
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---
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t
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(1 row)
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