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c2dc1a7976
By default VACUUM will skip pages that it can't immediately get exclusive access to, which means that even activities as harmless and unpredictable as checkpoint buffer writes might prevent a page from being processed. Ordinarily this is no big deal, but we have a small number of test cases that examine the results of VACUUM's processing and therefore will fail if the page of interest is skipped. This seems to be the explanation for some rare buildfarm failures. To fix, add the DISABLE_PAGE_SKIPPING option to the VACUUM commands in tests where this could be an issue. In passing, remove a duplicated query in pageinspect/sql/page.sql. Back-patch as necessary (some of these cases are as old as v10). Discussion: https://postgr.es/m/413923.1611006484@sss.pgh.pa.us
255 lines
8.3 KiB
Plaintext
255 lines
8.3 KiB
Plaintext
CREATE EXTENSION pg_visibility;
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--
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-- recently-dropped table
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--
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\set VERBOSITY sqlstate
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BEGIN;
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CREATE TABLE droppedtest (c int);
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SELECT 'droppedtest'::regclass::oid AS oid \gset
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SAVEPOINT q; DROP TABLE droppedtest; RELEASE q;
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SAVEPOINT q; SELECT * FROM pg_visibility_map(:oid); ROLLBACK TO q;
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ERROR: XX000
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-- ERROR: could not open relation with OID 16xxx
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SAVEPOINT q; SELECT 1; ROLLBACK TO q;
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?column?
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----------
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1
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(1 row)
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SAVEPOINT q; SELECT 1; ROLLBACK TO q;
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?column?
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----------
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1
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(1 row)
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SELECT pg_relation_size(:oid), pg_relation_filepath(:oid),
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has_table_privilege(:oid, 'SELECT');
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pg_relation_size | pg_relation_filepath | has_table_privilege
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------------------+----------------------+---------------------
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(1 row)
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SELECT * FROM pg_visibility_map(:oid);
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ERROR: XX000
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-- ERROR: could not open relation with OID 16xxx
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ROLLBACK;
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\set VERBOSITY default
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--
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-- check that using the module's functions with unsupported relations will fail
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--
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-- partitioned tables (the parent ones) don't have visibility maps
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create table test_partitioned (a int) partition by list (a);
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-- these should all fail
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select pg_visibility('test_partitioned', 0);
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ERROR: "test_partitioned" is not a table, materialized view, or TOAST table
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select pg_visibility_map('test_partitioned');
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ERROR: "test_partitioned" is not a table, materialized view, or TOAST table
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select pg_visibility_map_summary('test_partitioned');
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ERROR: "test_partitioned" is not a table, materialized view, or TOAST table
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select pg_check_frozen('test_partitioned');
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ERROR: "test_partitioned" is not a table, materialized view, or TOAST table
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select pg_truncate_visibility_map('test_partitioned');
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ERROR: "test_partitioned" is not a table, materialized view, or TOAST table
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create table test_partition partition of test_partitioned for values in (1);
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create index test_index on test_partition (a);
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-- indexes do not, so these all fail
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select pg_visibility('test_index', 0);
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ERROR: "test_index" is not a table, materialized view, or TOAST table
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select pg_visibility_map('test_index');
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ERROR: "test_index" is not a table, materialized view, or TOAST table
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select pg_visibility_map_summary('test_index');
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ERROR: "test_index" is not a table, materialized view, or TOAST table
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select pg_check_frozen('test_index');
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ERROR: "test_index" is not a table, materialized view, or TOAST table
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select pg_truncate_visibility_map('test_index');
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ERROR: "test_index" is not a table, materialized view, or TOAST table
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create view test_view as select 1;
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-- views do not have VMs, so these all fail
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select pg_visibility('test_view', 0);
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ERROR: "test_view" is not a table, materialized view, or TOAST table
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select pg_visibility_map('test_view');
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ERROR: "test_view" is not a table, materialized view, or TOAST table
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select pg_visibility_map_summary('test_view');
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ERROR: "test_view" is not a table, materialized view, or TOAST table
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select pg_check_frozen('test_view');
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ERROR: "test_view" is not a table, materialized view, or TOAST table
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select pg_truncate_visibility_map('test_view');
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ERROR: "test_view" is not a table, materialized view, or TOAST table
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create sequence test_sequence;
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-- sequences do not have VMs, so these all fail
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select pg_visibility('test_sequence', 0);
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ERROR: "test_sequence" is not a table, materialized view, or TOAST table
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select pg_visibility_map('test_sequence');
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ERROR: "test_sequence" is not a table, materialized view, or TOAST table
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select pg_visibility_map_summary('test_sequence');
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ERROR: "test_sequence" is not a table, materialized view, or TOAST table
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select pg_check_frozen('test_sequence');
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ERROR: "test_sequence" is not a table, materialized view, or TOAST table
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select pg_truncate_visibility_map('test_sequence');
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ERROR: "test_sequence" is not a table, materialized view, or TOAST table
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create foreign data wrapper dummy;
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create server dummy_server foreign data wrapper dummy;
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create foreign table test_foreign_table () server dummy_server;
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-- foreign tables do not have VMs, so these all fail
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select pg_visibility('test_foreign_table', 0);
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ERROR: "test_foreign_table" is not a table, materialized view, or TOAST table
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select pg_visibility_map('test_foreign_table');
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ERROR: "test_foreign_table" is not a table, materialized view, or TOAST table
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select pg_visibility_map_summary('test_foreign_table');
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ERROR: "test_foreign_table" is not a table, materialized view, or TOAST table
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select pg_check_frozen('test_foreign_table');
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ERROR: "test_foreign_table" is not a table, materialized view, or TOAST table
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select pg_truncate_visibility_map('test_foreign_table');
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ERROR: "test_foreign_table" is not a table, materialized view, or TOAST table
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-- check some of the allowed relkinds
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create table regular_table (a int, b text);
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alter table regular_table alter column b set storage external;
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insert into regular_table values (1, repeat('one', 1000)), (2, repeat('two', 1000));
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vacuum (disable_page_skipping) regular_table;
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select count(*) > 0 from pg_visibility('regular_table');
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?column?
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----------
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t
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(1 row)
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select count(*) > 0 from pg_visibility((select reltoastrelid from pg_class where relname = 'regular_table'));
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?column?
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----------
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t
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(1 row)
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truncate regular_table;
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select count(*) > 0 from pg_visibility('regular_table');
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?column?
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----------
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f
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(1 row)
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select count(*) > 0 from pg_visibility((select reltoastrelid from pg_class where relname = 'regular_table'));
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?column?
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----------
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f
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(1 row)
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create materialized view matview_visibility_test as select * from regular_table;
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vacuum (disable_page_skipping) matview_visibility_test;
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select count(*) > 0 from pg_visibility('matview_visibility_test');
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?column?
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----------
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f
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(1 row)
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insert into regular_table values (1), (2);
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refresh materialized view matview_visibility_test;
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select count(*) > 0 from pg_visibility('matview_visibility_test');
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?column?
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----------
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t
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(1 row)
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-- regular tables which are part of a partition *do* have visibility maps
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insert into test_partition values (1);
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vacuum (disable_page_skipping) test_partition;
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select count(*) > 0 from pg_visibility('test_partition', 0);
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?column?
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----------
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t
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(1 row)
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select count(*) > 0 from pg_visibility_map('test_partition');
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?column?
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----------
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t
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(1 row)
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select count(*) > 0 from pg_visibility_map_summary('test_partition');
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?column?
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----------
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t
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(1 row)
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select * from pg_check_frozen('test_partition'); -- hopefully none
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t_ctid
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--------
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(0 rows)
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select pg_truncate_visibility_map('test_partition');
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pg_truncate_visibility_map
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----------------------------
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(1 row)
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-- test copy freeze
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create table copyfreeze (a int, b char(1500));
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-- load all rows via COPY FREEZE and ensure that all pages are set all-visible
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-- and all-frozen.
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begin;
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truncate copyfreeze;
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copy copyfreeze from stdin freeze;
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commit;
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select * from pg_visibility_map('copyfreeze');
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blkno | all_visible | all_frozen
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-------+-------------+------------
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0 | t | t
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1 | t | t
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2 | t | t
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(3 rows)
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select * from pg_check_frozen('copyfreeze');
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t_ctid
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--------
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(0 rows)
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-- load half the rows via regular COPY and rest via COPY FREEZE. The pages
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-- which are touched by regular COPY must not be set all-visible/all-frozen. On
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-- the other hand, pages allocated by COPY FREEZE should be marked
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-- all-frozen/all-visible.
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begin;
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truncate copyfreeze;
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copy copyfreeze from stdin;
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copy copyfreeze from stdin freeze;
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commit;
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select * from pg_visibility_map('copyfreeze');
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blkno | all_visible | all_frozen
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-------+-------------+------------
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0 | f | f
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1 | f | f
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2 | t | t
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(3 rows)
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select * from pg_check_frozen('copyfreeze');
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t_ctid
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--------
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(0 rows)
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-- Try a mix of regular COPY and COPY FREEZE.
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begin;
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truncate copyfreeze;
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copy copyfreeze from stdin freeze;
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copy copyfreeze from stdin;
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copy copyfreeze from stdin freeze;
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commit;
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select * from pg_visibility_map('copyfreeze');
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blkno | all_visible | all_frozen
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-------+-------------+------------
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0 | t | t
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1 | f | f
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2 | t | t
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(3 rows)
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select * from pg_check_frozen('copyfreeze');
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t_ctid
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--------
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(0 rows)
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-- cleanup
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drop table test_partitioned;
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drop view test_view;
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drop sequence test_sequence;
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drop foreign table test_foreign_table;
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drop server dummy_server;
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drop foreign data wrapper dummy;
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drop materialized view matview_visibility_test;
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drop table regular_table;
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drop table copyfreeze;
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