Skip site navigation (1) Skip section navigation (2)

Re: Replication Syatem

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com>
Cc: "Gauri Kanekar" <meetgaurikanekar(at)gmail(dot)com>, "Greg Smith" <gsmith(at)gregsmith(dot)com>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Replication Syatem
Date: 2008-04-29 13:48:31
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
"Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> writes:

>> Any special guideline to follow to make HOT working??
> You can do couple of things to benefit from HOT.
> 1. HOT addresses a special, but common case where UPDATE operation
> does not change any of the index keys. So check if your UPDATE changes
> any of the index keys. If so, see if you can avoid having index
> involving that column. Of course, I won't advocate dropping an index
> if it would drastically impact your frequently run queries.
> 2. You may leave some free space in the heap (fillfactor less than
> 100). My recommendation would be to leave space worth of one row or
> slightly more than that to let first UPDATE be an HOT update.
> Subsequent UPDATEs in the page may reuse the dead row created by
> earlier UPDATEs.
> 3. Avoid any long running transactions.

Perhaps we should put this list in the FAQ.

  Gregory Stark
  Ask me about EnterpriseDB's 24x7 Postgres support!

In response to

pgsql-performance by date

Next:From: Tom LaneDate: 2008-04-29 14:16:02
Subject: Re: Replication Syatem
Previous:From: Pavan DeolaseeDate: 2008-04-29 13:16:00
Subject: Re: Replication Syatem

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group