From: | Vivek Khera <khera(at)kcilink(dot)com> |
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To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: further testing on IDE drives |
Date: | 2003-10-10 20:49:06 |
Message-ID: | x7smm0om2l.fsf@yertle.int.kciLink.com |
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Lists: | pgsql-performance |
>>>>> "BM" == Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
>> Sounds reasonable to me. Are there many / any scenarios where a plain
>> fsync would be faster than open_sync?
BM> Yes. If you were doing multiple WAL writes before transaction fsync,
BM> you would be fsyncing every write, rather than doing two writes and
BM> fsync'ing them both. I wonder if larger transactions would find
BM> open_sync slower?
consider loading a large database from a backup dump. one big
transaction during the COPY. I don't know the implications it has on
this scenario, though.
--
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Vivek Khera, Ph.D. Khera Communications, Inc.
Internet: khera(at)kciLink(dot)com Rockville, MD +1-240-453-8497
AIM: vivekkhera Y!: vivek_khera http://www.khera.org/~vivek/
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