Re: MVCC performance issue - Mailing list pgsql-performance

From bricklen
Subject Re: MVCC performance issue
Date
Msg-id AANLkTi=Js1_g3AeS7Zedu_fR2yp-USYCxoCxY0hpNeYh@mail.gmail.com
Whole thread Raw
In response to Re: MVCC performance issue  (Kenneth Marshall <ktm@rice.edu>)
Responses Re: MVCC performance issue  (Kenneth Marshall <ktm@rice.edu>)
List pgsql-performance
On Fri, Nov 12, 2010 at 5:52 AM, Kenneth Marshall <ktm@rice.edu> wrote:
>
> I cannot speak to your suggestion, but it sounds like you are not
> vacuuming enough and a lot of the bloat/randomization would be helped
> by making use of HOT updates in which the updates are all in the same
> page and are reclaimed almost immediately.
>
> Regards,
> Ken

IIRC, HOT only operates on non-indexed columns, so if you the tables
are heavily indexed you won't get the full benefit of HOT. I could be
wrong though.

pgsql-performance by date:

Previous
From: Jon Nelson
Date:
Subject: Re: postmaster consuming /lots/ of memory with hash aggregate. why?
Next
From: Kenneth Marshall
Date:
Subject: Re: MVCC performance issue