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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
85 lines
3.5 KiB
SQL
85 lines
3.5 KiB
SQL
CREATE EXTENSION pageinspect;
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CREATE TABLE test1 (a int, b int);
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INSERT INTO test1 VALUES (16777217, 131584);
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VACUUM (DISABLE_PAGE_SKIPPING) test1; -- set up FSM
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-- The page contents can vary, so just test that it can be read
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-- successfully, but don't keep the output.
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SELECT octet_length(get_raw_page('test1', 'main', 0)) AS main_0;
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SELECT octet_length(get_raw_page('test1', 'main', 1)) AS main_1;
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SELECT octet_length(get_raw_page('test1', 'fsm', 0)) AS fsm_0;
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SELECT octet_length(get_raw_page('test1', 'fsm', 1)) AS fsm_1;
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SELECT octet_length(get_raw_page('test1', 'vm', 0)) AS vm_0;
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SELECT octet_length(get_raw_page('test1', 'vm', 1)) AS vm_1;
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SELECT octet_length(get_raw_page('test1', 'main', -1));
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SELECT octet_length(get_raw_page('xxx', 'main', 0));
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SELECT octet_length(get_raw_page('test1', 'xxx', 0));
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SELECT get_raw_page('test1', 0) = get_raw_page('test1', 'main', 0);
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SELECT pagesize, version FROM page_header(get_raw_page('test1', 0));
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SELECT page_checksum(get_raw_page('test1', 0), 0) IS NOT NULL AS silly_checksum_test;
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SELECT page_checksum(get_raw_page('test1', 0), -1);
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SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
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FROM heap_page_items(get_raw_page('test1', 0));
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SELECT * FROM fsm_page_contents(get_raw_page('test1', 'fsm', 0));
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-- If we freeze the only tuple on test1, the infomask should
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-- always be the same in all test runs.
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VACUUM (FREEZE, DISABLE_PAGE_SKIPPING) test1;
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SELECT t_infomask, t_infomask2, raw_flags, combined_flags
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FROM heap_page_items(get_raw_page('test1', 0)),
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LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2);
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-- tests for decoding of combined flags
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-- HEAP_XMAX_SHR_LOCK = (HEAP_XMAX_EXCL_LOCK | HEAP_XMAX_KEYSHR_LOCK)
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SELECT * FROM heap_tuple_infomask_flags(x'0050'::int, 0);
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-- HEAP_XMIN_FROZEN = (HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID)
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SELECT * FROM heap_tuple_infomask_flags(x'0300'::int, 0);
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-- HEAP_MOVED = (HEAP_MOVED_IN | HEAP_MOVED_OFF)
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SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
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SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
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-- test all flags of t_infomask and t_infomask2
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SELECT unnest(raw_flags)
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FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
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SELECT unnest(combined_flags)
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FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
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-- no flags at all
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SELECT * FROM heap_tuple_infomask_flags(0, 0);
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-- no combined flags
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SELECT * FROM heap_tuple_infomask_flags(x'0010'::int, 0);
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DROP TABLE test1;
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-- check that using any of these functions with a partitioned table or index
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-- would fail
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create table test_partitioned (a int) partition by range (a);
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create index test_partitioned_index on test_partitioned (a);
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select get_raw_page('test_partitioned', 0); -- error about partitioned table
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select get_raw_page('test_partitioned_index', 0); -- error about partitioned index
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-- a regular table which is a member of a partition set should work though
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create table test_part1 partition of test_partitioned for values from ( 1 ) to (100);
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select get_raw_page('test_part1', 0); -- get farther and error about empty table
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drop table test_partitioned;
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-- check null bitmap alignment for table whose number of attributes is multiple of 8
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create table test8 (f1 int, f2 int, f3 int, f4 int, f5 int, f6 int, f7 int, f8 int);
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insert into test8(f1, f8) values (x'7f00007f'::int, 0);
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select t_bits, t_data from heap_page_items(get_raw_page('test8', 0));
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select tuple_data_split('test8'::regclass, t_data, t_infomask, t_infomask2, t_bits)
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from heap_page_items(get_raw_page('test8', 0));
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drop table test8;
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