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Allow pg_stat_statements to track WAL usage statistics.

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This commit adds three new columns in pg_stat_statements output to
display WAL usage statistics added by commit df3b181499.

This commit doesn't bump the version of pg_stat_statements as the
same is done for this release in commit 17e0328224.

Author: Kirill Bychik and Julien Rouhaud
Reviewed-by: Julien Rouhaud, Fujii Masao, Dilip Kumar and Amit Kapila
Discussion: https://postgr.es/m/CAB-hujrP8ZfUkvL5OYETipQwA=e3n7oqHFU=4ZLxWS_Cza3kQQ@mail.gmail.com
This commit is contained in:
Amit Kapila
2020-04-05 07:34:04 +05:30
parent 70de4e950c
commit 6b466bf5f2
5 changed files with 145 additions and 4 deletions
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23
contrib/pg_stat_statements/sql/pg_stat_statements.sql
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@ -101,6 +101,29 @@ SELECT * FROM test WHERE a IN (1, 2, 3, 4, 5);
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
--
-- INSERT, UPDATE, DELETE on test table to validate WAL generation metrics
--
SELECT pg_stat_statements_reset();
-- utility "create table" should not be shown
CREATE TABLE pgss_test (a int, b char(20));
INSERT INTO pgss_test VALUES(generate_series(1, 10), 'aaa');
UPDATE pgss_test SET b = 'bbb' WHERE a > 7;
DELETE FROM pgss_test WHERE a > 9;
-- DROP test table
SET pg_stat_statements.track_utility = TRUE;
DROP TABLE pgss_test;
SET pg_stat_statements.track_utility = FALSE;
-- Check WAL is generated for the above statements
SELECT query, calls, rows,
wal_bytes > 0 as wal_bytes_generated,
wal_records > 0 as wal_records_generated,
wal_records = rows as wal_records_as_rows
FROM pg_stat_statements ORDER BY query COLLATE "C";
--
-- pg_stat_statements.track = none
--