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Add vacuum_truncate configuration parameter.

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This new parameter works just like the storage parameter of the
same name: if set to true (which is the default), autovacuum and
VACUUM attempt to truncate any empty pages at the end of the table.
It is primarily intended to help users avoid locking issues on hot
standbys.  The setting can be overridden with the storage parameter
or VACUUM's TRUNCATE option.

Since there's presently no way to determine whether a Boolean
storage parameter is explicitly set or has just picked up the
default value, this commit also introduces an isset_offset member
to relopt_parse_elt.

Suggested-by: Will Storey <will@summercat.com>
Author: Nathan Bossart <nathandbossart@gmail.com>
Co-authored-by: Gurjeet Singh <gurjeet@singh.im>
Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Robert Treat <rob@xzilla.net>
Discussion: https://postgr.es/m/Z2DE4lDX4tHqNGZt%40dev.null
This commit is contained in:
Nathan Bossart
2025-03-20 10:16:50 -05:00
parent 618c64ffd3
commit 0164a0f9ee
13 changed files with 116 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
src/test/regress/expected/vacuum.out
View File

@@ -236,6 +236,7 @@ SELECT pg_relation_size('vac_truncate_test') > 0;
t
(1 row)
SET vacuum_truncate = false;
VACUUM (DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') = 0;
?column?
@@ -244,6 +245,32 @@ SELECT pg_relation_size('vac_truncate_test') = 0;
(1 row)
VACUUM (TRUNCATE FALSE, FULL TRUE) vac_truncate_test;
ALTER TABLE vac_truncate_test RESET (vacuum_truncate);
INSERT INTO vac_truncate_test VALUES (1, NULL), (NULL, NULL);
ERROR: null value in column "i" of relation "vac_truncate_test" violates not-null constraint
DETAIL: Failing row contains (null, null).
VACUUM (DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
?column?
----------
t
(1 row)
RESET vacuum_truncate;
VACUUM (TRUNCATE FALSE, DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
?column?
----------
t
(1 row)
VACUUM (DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') = 0;
?column?
----------
t
(1 row)
DROP TABLE vac_truncate_test;
-- partitioned table
CREATE TABLE vacparted (a int, b char) PARTITION BY LIST (a);

10
src/test/regress/sql/vacuum.sql
View File

@@ -194,9 +194,19 @@ CREATE TEMP TABLE vac_truncate_test(i INT NOT NULL, j text)
INSERT INTO vac_truncate_test VALUES (1, NULL), (NULL, NULL);
VACUUM (TRUNCATE FALSE, DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
SET vacuum_truncate = false;
VACUUM (DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') = 0;
VACUUM (TRUNCATE FALSE, FULL TRUE) vac_truncate_test;
ALTER TABLE vac_truncate_test RESET (vacuum_truncate);
INSERT INTO vac_truncate_test VALUES (1, NULL), (NULL, NULL);
VACUUM (DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
RESET vacuum_truncate;
VACUUM (TRUNCATE FALSE, DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
VACUUM (DISABLE_PAGE_SKIPPING) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') = 0;
DROP TABLE vac_truncate_test;
-- partitioned table