41 lines
1.9 KiB
Plaintext
41 lines
1.9 KiB
Plaintext
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--
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-- Verify correct calculation of checksums
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--
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-- Postgres' checksum algorithm produces different answers on little-endian
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-- and big-endian machines. The results of this test also vary depending
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-- on the configured block size. This test has several different expected
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-- results files to handle the following possibilities:
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--
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-- BLCKSZ end file
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-- 8K LE checksum.out
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-- 8K BE checksum_1.out
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--
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-- In future we might provide additional expected-results files for other
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-- block sizes, but there seems little point as long as so many other
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-- test scripts also show false failures for non-default block sizes.
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--
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-- This is to label the results files with blocksize:
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SHOW block_size;
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block_size
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------------
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8192
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(1 row)
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SHOW block_size \gset
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-- Apply page_checksum() to some different data patterns and block numbers
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SELECT blkno,
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page_checksum(decode(repeat('01', :block_size), 'hex'), blkno) AS checksum_01,
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page_checksum(decode(repeat('04', :block_size), 'hex'), blkno) AS checksum_04,
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page_checksum(decode(repeat('ff', :block_size), 'hex'), blkno) AS checksum_ff,
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page_checksum(decode(repeat('abcd', :block_size / 2), 'hex'), blkno) AS checksum_abcd,
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page_checksum(decode(repeat('e6d6', :block_size / 2), 'hex'), blkno) AS checksum_e6d6,
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page_checksum(decode(repeat('4a5e', :block_size / 2), 'hex'), blkno) AS checksum_4a5e
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FROM generate_series(0, 100, 50) AS a (blkno);
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blkno | checksum_01 | checksum_04 | checksum_ff | checksum_abcd | checksum_e6d6 | checksum_4a5e
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-------+-------------+-------------+-------------+---------------+---------------+---------------
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0 | -16327 | 8766 | -2722 | 13757 | -11485 | -31426
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50 | -16281 | 8780 | -2708 | 13771 | -11503 | -31440
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100 | -16235 | 8866 | -2758 | 13721 | -11577 | -31518
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(3 rows)
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