Re: PostgreSQL as a local in-memory cache - Mailing list pgsql-performance

From Bruce Momjian
Subject Re: PostgreSQL as a local in-memory cache
Date
Msg-id 201006232016.o5NKGAM26947@momjian.us
Whole thread Raw
In response to Re: PostgreSQL as a local in-memory cache  (Pavel Stehule)
List pgsql-performance
Pavel Stehule wrote:
> 2010/6/23 Bruce Momjian <>:
> > Tom Lane wrote:
> >> Dimitri Fontaine <> writes:
> >> > Josh Berkus <> writes:
> >> >> a) Eliminate WAL logging entirely
> >
> > If we elimiate WAL logging, that means a reinstall is required for even
> > a postmaster crash, which is a new non-durable behavior.
> >
> > Also, we just added wal_level = minimal, which might end up being a poor
> > name choice of we want wal_level = off in PG 9.1. ?Perhaps we should
> > have used wal_level = crash_safe in 9.0.
> >
> > I have added the following TODO:
> >
> > ? ? ? ?Consider a non-crash-safe wal_level that eliminates WAL activity
> >
> > ? ? ? ? ? ?* http://archives.postgresql.org/pgsql-performance/2010-06/msg00300.php
> >
> > --
>
> isn't fsync to off enought?

Well,  testing reported in the thread showed other settings also help,
though the checkpoint lengthening was not tested.

--
  Bruce Momjian  <>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + None of us is going to be here forever. +

pgsql-performance by date:

Previous
From: Pavel Stehule
Date:
Subject: Re: PostgreSQL as a local in-memory cache
Next
From: Robert Haas
Date:
Subject: Re: PostgreSQL as a local in-memory cache