Re: Acclerating INSERT/UPDATE using UPS

Hideyuki Kawashima wrote:
> Bruce,
> 
> Thanks for your comments, and let me answer to your question.
> Sigres is *not* significantly faster than just creating a file system on 
> the permanent memory and putting xlog on there.
> Sigres is slightly faster than the case because each backend does not 
> call XLogWrite while bgWriter does.

The question then is how much faster is it, and is that worth adding
extra code to improve it.

---------------------------------------------------------------------------


> 
> -- Hideyuki
> 
> Bruce Momjian wrote:
> > Tom Lane wrote:
> >   
> >> Gene  writes:
> >>     
> >>> ... just my two cents. on a side note, would putting the wal on a
> >>> tmpfs partition give you something similar?
> >>>       
> >> Indeed, I'm wondering why one needs to hack the Postgres core to throw
> >> away data integrity guarantees; there are plenty of ways to do that
> >> already :-(.  Hideyuki-san has not explained exactly what integrity
> >> assumptions he wants to make or not make.  I'm surely willing to listen
> >> to supporting a different set of assumptions than we currently use, but
> >> I'd like to see a clear explanation of what assumptions are being made
> >> and why they represent a useful case.
> >>     
> >
> > I am unsure why Sigres is significantly faster than just creating a file
> > system on the permanent memory and putting xlog on there.
> >
> >   
> 
> 
> 
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--  Bruce Momjian            http://momjian.us EnterpriseDB                               http://www.enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +