| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: count(*) performance improvement ideas |
| Date: | 2008-03-12 15:34:13 |
| Message-ID: | 200803121534.m2CFYDR29157@momjian.us |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> writes:
> > I am sure this must have been discussed before.
>
> Indeed. Apparently you didn't find the threads in which the idea of
> having transactions enter "delta" entries was discussed? Solves both
> the locking and the MVCC problems, at the cost that you need to make
> cleanup passes over the counter table fairly often.
>
> I don't see this as material for the core DB but it would make a great
> contrib module.
The TODO list has lots of details on this.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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