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Improve stability of test with vacuum_truncate in reloptions.sql

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This test has been using a simple VACUUM with pg_relation_size() to
check if a relation gets physically truncated or not, but forgot the
fact that some concurrent activity, like checkpoint buffer writes, could
cause some pages to be skipped.  The second test enabling
vacuum_truncate could fail, seeing a non-empty relation.  The first test
would not have failed, but could finish by testing a behavior different
than the one aimed for.  Both tests gain a FREEZE option, to make the
vacuums more aggressive and prevent page skips.

This is similar to the issues fixed in c2dc1a7.

Author: Arseny Sher
Reviewed-by: Masahiko Sawada
Discussion: https://postgr.es/m/87tuotr2hh.fsf@ars-thinkpad
backpatch-through: 12
This commit is contained in:
Michael Paquier 2021-04-02 09:44:42 +09:00
parent 1ebdec8c03
commit fe246d1c11
2 changed files with 8 additions and 4 deletions
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6
src/test/regress/expected/reloptions.out
View File

@ -102,7 +102,8 @@ SELECT reloptions FROM pg_class WHERE oid = 'reloptions_test'::regclass;
INSERT INTO reloptions_test VALUES (1, NULL), (NULL, NULL);
ERROR: null value in column "i" of relation "reloptions_test" violates not-null constraint
DETAIL: Failing row contains (null, null).
VACUUM reloptions_test;
-- Do an aggressive vacuum to prevent page-skipping.
VACUUM FREEZE reloptions_test;
SELECT pg_relation_size('reloptions_test') > 0;
?column?
----------
@ -127,7 +128,8 @@ SELECT reloptions FROM pg_class WHERE oid = 'reloptions_test'::regclass;
INSERT INTO reloptions_test VALUES (1, NULL), (NULL, NULL);
ERROR: null value in column "i" of relation "reloptions_test" violates not-null constraint
DETAIL: Failing row contains (null, null).
VACUUM reloptions_test;
-- Do an aggressive vacuum to prevent page-skipping.
VACUUM FREEZE reloptions_test;
SELECT pg_relation_size('reloptions_test') = 0;
?column?
----------

6
src/test/regress/sql/reloptions.sql
View File

@ -61,7 +61,8 @@ CREATE TABLE reloptions_test(i INT NOT NULL, j text)
autovacuum_enabled=false);
SELECT reloptions FROM pg_class WHERE oid = 'reloptions_test'::regclass;
INSERT INTO reloptions_test VALUES (1, NULL), (NULL, NULL);
VACUUM reloptions_test;
-- Do an aggressive vacuum to prevent page-skipping.
VACUUM FREEZE reloptions_test;
SELECT pg_relation_size('reloptions_test') > 0;
SELECT reloptions FROM pg_class WHERE oid =
@ -71,7 +72,8 @@ SELECT reloptions FROM pg_class WHERE oid =
ALTER TABLE reloptions_test RESET (vacuum_truncate);
SELECT reloptions FROM pg_class WHERE oid = 'reloptions_test'::regclass;
INSERT INTO reloptions_test VALUES (1, NULL), (NULL, NULL);
VACUUM reloptions_test;
-- Do an aggressive vacuum to prevent page-skipping.
VACUUM FREEZE reloptions_test;
SELECT pg_relation_size('reloptions_test') = 0;
-- Test toast.* options