| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
| Cc: | Martijn van Oosterhout <kleptog(at)svana(dot)org>, Zeugswetter Andreas DCP SD <ZeugswetterA(at)spardat(dot)at>, Greg Stark <gsstark(at)mit(dot)edu>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Rod Taylor <pg(at)rbt(dot)ca>, "Bort, Paul" <pbort(at)tmwsystems(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Compression and on-disk sorting |
| Date: | 2006-05-18 20:55:17 |
| Message-ID: | 20865.1147985717@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Jim C. Nasby" <jnasby(at)pervasive(dot)com> writes:
> Actually, I guess the amount of memory used for zlib's lookback buffer
> (or whatever they call it) could be pretty substantial, and I'm not sure
> if there would be a way to combine that across all tapes.
But there's only one active write tape at a time. My recollection of
zlib is that compression is memory-hungry but decompression not so much,
so it seems like this shouldn't be a huge deal.
regards, tom lane
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