Aug 16 20:51:19 postgres[22329]: [2-2] STATEMENT: SELECT id,readbm,writebm,survbm,timeout FROM Users WHERE username='packetlogicd' AND password=md5('xxxxx')
I'm reading the comment in src/backend/utils/cache/relmapper.c .
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Therefore mapped catalogs can only be relocated by operations such as VACUUM FULL and CLUSTER, which make no transactionally-significant changes: it must be safe for the new file to replace the old, even if the transaction itself aborts.
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Does this comment mean it's expected to get this kind of checksum error if the timing is really bad?