Robert Haas wrote:
> On Wed, Jan 19, 2011 at 12:07 PM, Bruce Momjian <bruce@xxxxxxxxxx> wrote:
> > Chris Browne wrote:
> >> gentosaker@xxxxxxxxx (A B) writes:
> >> > If you just wanted PostgreSQL to go as fast as possible WITHOUT any
> >> > care for your data (you accept 100% dataloss and datacorruption if any
> >> > error should occur), what settings should you use then?
> >>
> >> Use /dev/null. ?It is web scale, and there are good tutorials.
> >>
> >> But seriously, there *are* cases where "blind speed" is of use. ?When
> >> loading data into a fresh database is a good time for this; if things
> >> fall over, it may be pretty acceptable to start "from scratch" with
> >> mkfs/initdb.
> >>
> >> I'd:
> >> - turn off fsync
> >> - turn off synchronous commit
> >> - put as much as possible onto Ramdisk/tmpfs/similar as possible
> >
> > FYI, we do have a documentation section about how to configure Postgres
> > for improved performance if you don't care about durability:
> >
> > ? ? ? ?http://developer.postgresql.org/pgdocs/postgres/non-durability.html
>
> This sentence looks to me like it should be removed, or perhaps clarified:
>
> This does affect database crash transaction durability.
Uh, doesn't it affect database crash transaction durability? I have
applied the attached patch to clarify things. Thanks.
--
Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
diff --git a/doc/src/sgml/perform.sgml b/doc/src/sgml/perform.sgml
index 2699828..fb55598 100644
*** a/doc/src/sgml/perform.sgml
--- b/doc/src/sgml/perform.sgml
*************** SELECT * FROM x, y, a, b, c WHERE someth
*** 1159,1165 ****
<para>
Turn off <xref linkend="guc-synchronous-commit">; there might be no
need to write the <acronym>WAL</acronym> to disk on every
! commit. This does affect database crash transaction durability.
</para>
</listitem>
</itemizedlist>
--- 1159,1165 ----
<para>
Turn off <xref linkend="guc-synchronous-commit">; there might be no
need to write the <acronym>WAL</acronym> to disk on every
! commit. This can cause transaction loss after a server crash.
</para>
</listitem>
</itemizedlist>
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