32 lines
1.3 KiB
SQL
32 lines
1.3 KiB
SQL
--
|
|
-- Verify correct calculation of checksums
|
|
--
|
|
-- Postgres' checksum algorithm produces different answers on little-endian
|
|
-- and big-endian machines. The results of this test also vary depending
|
|
-- on the configured block size. This test has several different expected
|
|
-- results files to handle the following possibilities:
|
|
--
|
|
-- BLCKSZ end file
|
|
-- 8K LE checksum.out
|
|
-- 8K BE checksum_1.out
|
|
--
|
|
-- In future we might provide additional expected-results files for other
|
|
-- block sizes, but there seems little point as long as so many other
|
|
-- test scripts also show false failures for non-default block sizes.
|
|
--
|
|
|
|
-- This is to label the results files with blocksize:
|
|
SHOW block_size;
|
|
|
|
SHOW block_size \gset
|
|
|
|
-- Apply page_checksum() to some different data patterns and block numbers
|
|
SELECT blkno,
|
|
page_checksum(decode(repeat('01', :block_size), 'hex'), blkno) AS checksum_01,
|
|
page_checksum(decode(repeat('04', :block_size), 'hex'), blkno) AS checksum_04,
|
|
page_checksum(decode(repeat('ff', :block_size), 'hex'), blkno) AS checksum_ff,
|
|
page_checksum(decode(repeat('abcd', :block_size / 2), 'hex'), blkno) AS checksum_abcd,
|
|
page_checksum(decode(repeat('e6d6', :block_size / 2), 'hex'), blkno) AS checksum_e6d6,
|
|
page_checksum(decode(repeat('4a5e', :block_size / 2), 'hex'), blkno) AS checksum_4a5e
|
|
FROM generate_series(0, 100, 50) AS a (blkno);
|