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Add some basic regression tests for pg_freespacemap 

The number of relation pages is tricky to get right in a portable way,
particularly across 32b and 64b builds, but checking after the existence
of the FSM and if there is any space available space should be stable
enough with a minimal number of tuples involved.  This commit introduces
checks on a table with some btree, BRIN and hash indexes, as a first
attempt.

Author: Dong Wook Lee, Fabrízio de Royes Mello, Michael Paquier
Discussion: https://postgr.es/m/CAAcByaJ5KW3bd7fJr=jPEyK8M_UzXJFHHBVuOcBe+JHD8txRyQ@mail.gmail.com
This commit is contained in:
Michael Paquier 2022-03-24 09:36:30 +09:00
parent 3ac7d02412
commit a1bc4d3590
4 changed files with 123 additions and 0 deletions
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4
contrib/pg_freespacemap/.gitignore vendored Normal file
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# Generated subdirectories
/log/
/results/
/tmp_check/

2
contrib/pg_freespacemap/Makefile
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@ -10,6 +10,8 @@ DATA = pg_freespacemap--1.1.sql pg_freespacemap--1.1--1.2.sql \
pg_freespacemap--1.0--1.1.sql
PGFILEDESC = "pg_freespacemap - monitoring of free space map"
REGRESS = pg_freespacemap
ifdef USE_PGXS
PG_CONFIG = pg_config
PGXS := $(shell $(PG_CONFIG) --pgxs)

85
contrib/pg_freespacemap/expected/pg_freespacemap.out Normal file
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CREATE EXTENSION pg_freespacemap;
CREATE TABLE freespace_tab (c1 int) WITH (autovacuum_enabled = off);
CREATE INDEX freespace_brin ON freespace_tab USING brin (c1);
CREATE INDEX freespace_btree ON freespace_tab USING btree (c1);
CREATE INDEX freespace_hash ON freespace_tab USING hash (c1);
-- report all the sizes of the FSMs for all the relation blocks.
WITH rel AS (SELECT oid::regclass AS id FROM pg_class WHERE relname ~ 'freespace')
SELECT rel.id, fsm.blkno, (fsm.avail > 0) AS is_avail
FROM rel, LATERAL pg_freespace(rel.id) AS fsm
ORDER BY 1, 2;
id | blkno | is_avail
-----------------+-------+----------
freespace_brin | 0 | f
freespace_brin | 1 | f
freespace_brin | 2 | t
freespace_btree | 0 | f
freespace_hash | 0 | f
freespace_hash | 1 | f
freespace_hash | 2 | f
freespace_hash | 3 | f
freespace_hash | 4 | f
freespace_hash | 5 | f
freespace_hash | 6 | f
freespace_hash | 7 | f
freespace_hash | 8 | f
freespace_hash | 9 | f
(14 rows)
INSERT INTO freespace_tab VALUES (1);
VACUUM freespace_tab;
WITH rel AS (SELECT oid::regclass AS id FROM pg_class WHERE relname ~ 'freespace')
SELECT rel.id, fsm.blkno, (fsm.avail > 0) AS is_avail
FROM rel, LATERAL pg_freespace(rel.id) AS fsm
ORDER BY 1, 2;
id | blkno | is_avail
-----------------+-------+----------
freespace_tab | 0 | t
freespace_brin | 0 | f
freespace_brin | 1 | f
freespace_brin | 2 | t
freespace_btree | 0 | f
freespace_btree | 1 | f
freespace_hash | 0 | f
freespace_hash | 1 | f
freespace_hash | 2 | f
freespace_hash | 3 | f
freespace_hash | 4 | f
freespace_hash | 5 | f
freespace_hash | 6 | f
freespace_hash | 7 | f
freespace_hash | 8 | f
freespace_hash | 9 | f
(16 rows)
DELETE FROM freespace_tab;
VACUUM freespace_tab;
WITH rel AS (SELECT oid::regclass AS id FROM pg_class WHERE relname ~ 'freespace')
SELECT rel.id, fsm.blkno, (fsm.avail > 0) AS is_avail
FROM rel, LATERAL pg_freespace(rel.id) AS fsm
ORDER BY 1, 2;
id | blkno | is_avail
-----------------+-------+----------
freespace_brin | 0 | f
freespace_brin | 1 | f
freespace_brin | 2 | t
freespace_btree | 0 | f
freespace_btree | 1 | f
freespace_hash | 0 | f
freespace_hash | 1 | f
freespace_hash | 2 | f
freespace_hash | 3 | f
freespace_hash | 4 | f
freespace_hash | 5 | f
freespace_hash | 6 | f
freespace_hash | 7 | f
freespace_hash | 8 | f
freespace_hash | 9 | f
(15 rows)
-- failures with incorrect block number
SELECT * FROM pg_freespace('freespace_tab', -1);
ERROR: invalid block number
SELECT * FROM pg_freespace('freespace_tab', 4294967295);
ERROR: invalid block number
DROP TABLE freespace_tab;

32
contrib/pg_freespacemap/sql/pg_freespacemap.sql Normal file
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CREATE EXTENSION pg_freespacemap;
CREATE TABLE freespace_tab (c1 int) WITH (autovacuum_enabled = off);
CREATE INDEX freespace_brin ON freespace_tab USING brin (c1);
CREATE INDEX freespace_btree ON freespace_tab USING btree (c1);
CREATE INDEX freespace_hash ON freespace_tab USING hash (c1);
-- report all the sizes of the FSMs for all the relation blocks.
WITH rel AS (SELECT oid::regclass AS id FROM pg_class WHERE relname ~ 'freespace')
SELECT rel.id, fsm.blkno, (fsm.avail > 0) AS is_avail
FROM rel, LATERAL pg_freespace(rel.id) AS fsm
ORDER BY 1, 2;
INSERT INTO freespace_tab VALUES (1);
VACUUM freespace_tab;
WITH rel AS (SELECT oid::regclass AS id FROM pg_class WHERE relname ~ 'freespace')
SELECT rel.id, fsm.blkno, (fsm.avail > 0) AS is_avail
FROM rel, LATERAL pg_freespace(rel.id) AS fsm
ORDER BY 1, 2;
DELETE FROM freespace_tab;
VACUUM freespace_tab;
WITH rel AS (SELECT oid::regclass AS id FROM pg_class WHERE relname ~ 'freespace')
SELECT rel.id, fsm.blkno, (fsm.avail > 0) AS is_avail
FROM rel, LATERAL pg_freespace(rel.id) AS fsm
ORDER BY 1, 2;
-- failures with incorrect block number
SELECT * FROM pg_freespace('freespace_tab', -1);
SELECT * FROM pg_freespace('freespace_tab', 4294967295);
DROP TABLE freespace_tab;