| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com> |
| Cc: | pgsql-patches(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] wal_checksum = on (default) | off |
| Date: | 2007-01-04 19:43:11 |
| Message-ID: | 24772.1167939791@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com> writes:
> Quoting wikipedia:
> "Adler-32 has a weakness for short messages with few hundred bytes,
> because the checksums for these messages have a poor coverage of
> the 32 available bits...Jonathan Stone discovered in 2001 that Adler-32
> has a weakness...An extended explanation can be found in RFC 3309,
> which mandates the use of CRC32 instead of Adler-32...."
[ looks at the RFC... ] Yeah, so that pretty much kills it for WAL
entries, which are mostly short.
regards, tom lane
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