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Add tests for pg_stat_io

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Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/20200124195226.lth52iydq2n2uilq@alap3.anarazel.de
This commit is contained in:
Andres Freund
2023-02-11 09:54:44 -08:00
parent 9c83bbcf7e
commit 10a082bf72
4 changed files with 431 additions and 0 deletions
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27
contrib/amcheck/sql/check_heap.sql
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@ -20,11 +20,29 @@ SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'NONE');
SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'ALL-FROZEN');
SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'ALL-VISIBLE');
-- Add some data so subsequent tests are not entirely trivial
INSERT INTO heaptest (a, b)
(SELECT gs, repeat('x', gs)
FROM generate_series(1,50) gs);
-- pg_stat_io test:
-- verify_heapam always uses a BAS_BULKREAD BufferAccessStrategy, whereas a
-- sequential scan does so only if the table is large enough when compared to
-- shared buffers (see initscan()). CREATE DATABASE ... also unconditionally
-- uses a BAS_BULKREAD strategy, but we have chosen to use a tablespace and
-- verify_heapam to provide coverage instead of adding another expensive
-- operation to the main regression test suite.
--
-- Create an alternative tablespace and move the heaptest table to it, causing
-- it to be rewritten and all the blocks to reliably evicted from shared
-- buffers -- guaranteeing actual reads when we next select from it.
SET allow_in_place_tablespaces = true;
CREATE TABLESPACE regress_test_stats_tblspc LOCATION '';
SELECT sum(reads) AS stats_bulkreads_before
FROM pg_stat_io WHERE io_context = 'bulkread' \gset
ALTER TABLE heaptest SET TABLESPACE regress_test_stats_tblspc;
-- Check that valid options are not rejected nor corruption reported
-- for a non-empty table
SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'none');
@ -32,6 +50,14 @@ SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'all-frozen');
SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'all-visible');
SELECT * FROM verify_heapam(relation := 'heaptest', startblock := 0, endblock := 0);
-- verify_heapam should have read in the page written out by
-- ALTER TABLE ... SET TABLESPACE ...
-- causing an additional bulkread, which should be reflected in pg_stat_io.
SELECT pg_stat_force_next_flush();
SELECT sum(reads) AS stats_bulkreads_after
FROM pg_stat_io WHERE io_context = 'bulkread' \gset
SELECT :stats_bulkreads_after > :stats_bulkreads_before;
CREATE ROLE regress_heaptest_role;
-- verify permissions are checked (error due to function not callable)
@ -110,6 +136,7 @@ SELECT * FROM verify_heapam('test_foreign_table',
-- cleanup
DROP TABLE heaptest;
DROP TABLESPACE regress_test_stats_tblspc;
DROP TABLE test_partition;
DROP TABLE test_partitioned;
DROP OWNED BY regress_heaptest_role; -- permissions