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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('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 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;
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