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Add TRUNCATE parameter to VACUUM.

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This commit adds new parameter to VACUUM command, TRUNCATE,
which specifies that VACUUM should attempt to truncate off
any empty pages at the end of the table and allow the disk space
for the truncated pages to be returned to the operating system.

This parameter, if specified, overrides the vacuum_truncate
reloption. If neither the reloption nor the VACUUM option is
used, the default is true, as before.

Author: Fujii Masao
Reviewed-by: Julien Rouhaud, Masahiko Sawada
Discussion: https://postgr.es/m/CAD21AoD+qtrSDL=GSma4Wd3kLYLeRC0hPna-YAdkDeV4z156vg@mail.gmail.com
This commit is contained in:
Fujii Masao
2019-05-08 02:10:33 +09:00
parent 98719af6c2
commit b84dbc8eb8
9 changed files with 81 additions and 10 deletions
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22
src/test/regress/expected/vacuum.out
View File

@@ -88,6 +88,28 @@ VACUUM (INDEX_CLEANUP FALSE, FREEZE TRUE) vaccluster;
-- index cleanup option is ignored if VACUUM FULL
VACUUM (INDEX_CLEANUP TRUE, FULL TRUE) no_index_cleanup;
VACUUM (FULL TRUE) no_index_cleanup;
-- TRUNCATE option
CREATE TABLE vac_truncate_test(i INT NOT NULL, j text)
WITH (vacuum_truncate=true, autovacuum_enabled=false);
INSERT INTO vac_truncate_test VALUES (1, NULL), (NULL, NULL);
ERROR: null value in column "i" violates not-null constraint
DETAIL: Failing row contains (null, null).
VACUUM (TRUNCATE FALSE) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
?column?
----------
t
(1 row)
VACUUM vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') = 0;
?column?
----------
t
(1 row)
VACUUM (TRUNCATE FALSE, FULL TRUE) vac_truncate_test;
DROP TABLE vac_truncate_test;
-- partitioned table
CREATE TABLE vacparted (a int, b char) PARTITION BY LIST (a);
CREATE TABLE vacparted1 PARTITION OF vacparted FOR VALUES IN (1);

11
src/test/regress/sql/vacuum.sql
View File

@@ -71,6 +71,17 @@ VACUUM (INDEX_CLEANUP FALSE, FREEZE TRUE) vaccluster;
VACUUM (INDEX_CLEANUP TRUE, FULL TRUE) no_index_cleanup;
VACUUM (FULL TRUE) no_index_cleanup;
-- TRUNCATE option
CREATE TABLE vac_truncate_test(i INT NOT NULL, j text)
WITH (vacuum_truncate=true, autovacuum_enabled=false);
INSERT INTO vac_truncate_test VALUES (1, NULL), (NULL, NULL);
VACUUM (TRUNCATE FALSE) vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') > 0;
VACUUM vac_truncate_test;
SELECT pg_relation_size('vac_truncate_test') = 0;
VACUUM (TRUNCATE FALSE, FULL TRUE) vac_truncate_test;
DROP TABLE vac_truncate_test;
-- partitioned table
CREATE TABLE vacparted (a int, b char) PARTITION BY LIST (a);
CREATE TABLE vacparted1 PARTITION OF vacparted FOR VALUES IN (1);