postgresql/contrib/pageinspect/expected/page.out
Tom Lane c2dc1a7976 Disable vacuum page skipping in selected test cases.
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
2021-01-20 11:49:29 -05:00

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CREATE EXTENSION pageinspect;
CREATE TABLE test1 (a int, b int);
INSERT INTO test1 VALUES (16777217, 131584);
VACUUM (DISABLE_PAGE_SKIPPING) test1; -- set up FSM
-- The page contents can vary, so just test that it can be read
-- successfully, but don't keep the output.
SELECT octet_length(get_raw_page('test1', 'main', 0)) AS main_0;
main_0
--------
8192
(1 row)
SELECT octet_length(get_raw_page('test1', 'main', 1)) AS main_1;
ERROR: block number 1 is out of range for relation "test1"
SELECT octet_length(get_raw_page('test1', 'fsm', 0)) AS fsm_0;
fsm_0
-------
8192
(1 row)
SELECT octet_length(get_raw_page('test1', 'fsm', 1)) AS fsm_1;
fsm_1
-------
8192
(1 row)
SELECT octet_length(get_raw_page('test1', 'vm', 0)) AS vm_0;
vm_0
------
8192
(1 row)
SELECT octet_length(get_raw_page('test1', 'vm', 1)) AS vm_1;
ERROR: block number 1 is out of range for relation "test1"
SELECT octet_length(get_raw_page('test1', 'main', -1));
ERROR: invalid block number
SELECT octet_length(get_raw_page('xxx', 'main', 0));
ERROR: relation "xxx" does not exist
SELECT octet_length(get_raw_page('test1', 'xxx', 0));
ERROR: invalid fork name
HINT: Valid fork names are "main", "fsm", "vm", and "init".
SELECT get_raw_page('test1', 0) = get_raw_page('test1', 'main', 0);
?column?
----------
t
(1 row)
SELECT pagesize, version FROM page_header(get_raw_page('test1', 0));
pagesize | version
----------+---------
8192 | 4
(1 row)
SELECT page_checksum(get_raw_page('test1', 0), 0) IS NOT NULL AS silly_checksum_test;
silly_checksum_test
---------------------
t
(1 row)
SELECT page_checksum(get_raw_page('test1', 0), -1);
ERROR: invalid block number
SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
FROM heap_page_items(get_raw_page('test1', 0));
tuple_data_split
-------------------------------
{"\\x01000001","\\x00020200"}
(1 row)
SELECT * FROM fsm_page_contents(get_raw_page('test1', 'fsm', 0));
fsm_page_contents
-------------------
0: 254 +
1: 254 +
3: 254 +
7: 254 +
15: 254 +
31: 254 +
63: 254 +
127: 254 +
255: 254 +
511: 254 +
1023: 254 +
2047: 254 +
4095: 254 +
fp_next_slot: 0 +
(1 row)
-- If we freeze the only tuple on test1, the infomask should
-- always be the same in all test runs.
VACUUM (FREEZE, DISABLE_PAGE_SKIPPING) test1;
SELECT t_infomask, t_infomask2, raw_flags, combined_flags
FROM heap_page_items(get_raw_page('test1', 0)),
LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2);
t_infomask | t_infomask2 | raw_flags | combined_flags
------------+-------------+-----------------------------------------------------------+--------------------
2816 | 2 | {HEAP_XMIN_COMMITTED,HEAP_XMIN_INVALID,HEAP_XMAX_INVALID} | {HEAP_XMIN_FROZEN}
(1 row)
-- tests for decoding of combined flags
-- HEAP_XMAX_SHR_LOCK = (HEAP_XMAX_EXCL_LOCK | HEAP_XMAX_KEYSHR_LOCK)
SELECT * FROM heap_tuple_infomask_flags(x'0050'::int, 0);
raw_flags | combined_flags
---------------------------------------------+----------------------
{HEAP_XMAX_KEYSHR_LOCK,HEAP_XMAX_EXCL_LOCK} | {HEAP_XMAX_SHR_LOCK}
(1 row)
-- HEAP_XMIN_FROZEN = (HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID)
SELECT * FROM heap_tuple_infomask_flags(x'0300'::int, 0);
raw_flags | combined_flags
-----------------------------------------+--------------------
{HEAP_XMIN_COMMITTED,HEAP_XMIN_INVALID} | {HEAP_XMIN_FROZEN}
(1 row)
-- HEAP_MOVED = (HEAP_MOVED_IN | HEAP_MOVED_OFF)
SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
raw_flags | combined_flags
--------------------------------+----------------
{HEAP_MOVED_OFF,HEAP_MOVED_IN} | {HEAP_MOVED}
(1 row)
SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
raw_flags | combined_flags
--------------------------------+----------------
{HEAP_MOVED_OFF,HEAP_MOVED_IN} | {HEAP_MOVED}
(1 row)
-- test all flags of t_infomask and t_infomask2
SELECT unnest(raw_flags)
FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
unnest
-----------------------
HEAP_COMBOCID
HEAP_HASEXTERNAL
HEAP_HASNULL
HEAP_HASOID_OLD
HEAP_HASVARWIDTH
HEAP_HOT_UPDATED
HEAP_KEYS_UPDATED
HEAP_MOVED_IN
HEAP_MOVED_OFF
HEAP_ONLY_TUPLE
HEAP_UPDATED
HEAP_XMAX_COMMITTED
HEAP_XMAX_EXCL_LOCK
HEAP_XMAX_INVALID
HEAP_XMAX_IS_MULTI
HEAP_XMAX_KEYSHR_LOCK
HEAP_XMAX_LOCK_ONLY
HEAP_XMIN_COMMITTED
HEAP_XMIN_INVALID
(19 rows)
SELECT unnest(combined_flags)
FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
unnest
--------------------
HEAP_MOVED
HEAP_XMAX_SHR_LOCK
HEAP_XMIN_FROZEN
(3 rows)
-- no flags at all
SELECT * FROM heap_tuple_infomask_flags(0, 0);
raw_flags | combined_flags
-----------+----------------
{} | {}
(1 row)
-- no combined flags
SELECT * FROM heap_tuple_infomask_flags(x'0010'::int, 0);
raw_flags | combined_flags
-------------------------+----------------
{HEAP_XMAX_KEYSHR_LOCK} | {}
(1 row)
DROP TABLE test1;
-- check that using any of these functions with a partitioned table or index
-- would fail
create table test_partitioned (a int) partition by range (a);
create index test_partitioned_index on test_partitioned (a);
select get_raw_page('test_partitioned', 0); -- error about partitioned table
ERROR: cannot get raw page from partitioned table "test_partitioned"
select get_raw_page('test_partitioned_index', 0); -- error about partitioned index
ERROR: cannot get raw page from partitioned index "test_partitioned_index"
-- a regular table which is a member of a partition set should work though
create table test_part1 partition of test_partitioned for values from ( 1 ) to (100);
select get_raw_page('test_part1', 0); -- get farther and error about empty table
ERROR: block number 0 is out of range for relation "test_part1"
drop table test_partitioned;
-- check null bitmap alignment for table whose number of attributes is multiple of 8
create table test8 (f1 int, f2 int, f3 int, f4 int, f5 int, f6 int, f7 int, f8 int);
insert into test8(f1, f8) values (x'7f00007f'::int, 0);
select t_bits, t_data from heap_page_items(get_raw_page('test8', 0));
t_bits | t_data
----------+--------------------
10000001 | \x7f00007f00000000
(1 row)
select tuple_data_split('test8'::regclass, t_data, t_infomask, t_infomask2, t_bits)
from heap_page_items(get_raw_page('test8', 0));
tuple_data_split
-------------------------------------------------------------
{"\\x7f00007f",NULL,NULL,NULL,NULL,NULL,NULL,"\\x00000000"}
(1 row)
drop table test8;