From: Andres Freund <andres@2ndquadrant.com>
To: Julien Cigar <jcigar@ulb.ac.be>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres becoming slow, only full vacuum fixes it
Date: Mon, 24 Sep 2012 15:34:31 +0200
Message-ID: <201209241534.31974.andres@2ndquadrant.com> (raw)
In-Reply-To: <506057E7.5090008@ulb.ac.be>
References: <D15ECA12-8D6E-4E53-A294-5E175564CA61@gmail.com>
<201209241434.56760.andres@2ndquadrant.com>
<506057E7.5090008@ulb.ac.be>
On Monday, September 24, 2012 02:53:59 PM Julien Cigar wrote:
> On 09/24/2012 14:34, Andres Freund wrote:
> > On Monday, September 24, 2012 02:21:09 PM Julien Cigar wrote:
> >> 5) synchronous_commit = off should only be used if you have a
> >> battery-backed write cache.
> >
> > Huh? Are you possibly confusing this with full_page_writes?
>
> indeed...! sorry for that
> (note that you still have a (very) small chance of loosing data with
> synchronous_commit = off if your server crashes between two "commit
> chunks")
Sure, you have a chance of loosing the last some transactions, but you won't
corrupt anything. Thats the entire point of the setting ;)
Greetings,
Andres
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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To: pgsql-performance@postgresql.org
Cc: andres@2ndquadrant.com, jcigar@ulb.ac.be
Subject: Re: Postgres becoming slow, only full vacuum fixes it
In-Reply-To: <201209241534.31974.andres@2ndquadrant.com>
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