| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Aidan Van Dyk <aidan(at)highrise(dot)ca>, Greg Smith <gsmith(at)gregsmith(dot)com>, Kyle Cordes <kyle(at)kylecordes(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Improving compressibility of WAL files |
| Date: | 2009-01-09 16:02:15 |
| Message-ID: | 25978.1231516935@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-hackers |
Bruce Momjian <bruce(at)momjian(dot)us> writes:
> Tom Lane wrote:
>> Which also means that everyone pays the performance penalty whether
>> they get any benefit or not. The point of the external solution
>> is to do the work only in installations that get some benefit.
>> We've been over this ground before...
> If there is a performance penalty, you are right, but if the zeroing is
> done as part of the archiving, it seems near zero cost enough to do it
> all the time, no?
It's the same cost no matter which process does it.
regards, tom lane
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