postgres/contrib/pageinspect/sql/page.sql

CREATE EXTENSION pageinspect;

CREATE TABLE test1 (a int, b int);
INSERT INTO test1 VALUES (16777217, 131584);

VACUUM 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;
SELECT octet_length(get_raw_page('test1', 'main', 1)) AS main_1;

SELECT octet_length(get_raw_page('test1', 'fsm', 0)) AS fsm_0;
SELECT octet_length(get_raw_page('test1', 'fsm', 1)) AS fsm_1;

SELECT octet_length(get_raw_page('test1', 'vm', 0)) AS vm_0;
SELECT octet_length(get_raw_page('test1', 'vm', 1)) AS vm_1;

SELECT octet_length(get_raw_page('xxx', 'main', 0));
SELECT octet_length(get_raw_page('test1', 'xxx', 0));

SELECT get_raw_page('test1', 0) = get_raw_page('test1', 'main', 0);

SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
    FROM heap_page_items(get_raw_page('test1', 0));

SELECT * FROM fsm_page_contents(get_raw_page('test1', 'fsm', 0));

DROP TABLE test1;