| From: | "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | "Yinan Li" <yinanli(at)cse(dot)ust(dot)hk> |
| Cc: | "Postgresql Performance" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: how to improve the performance of creating index |
| Date: | 2007-10-19 14:50:07 |
| Message-ID: | 4718C41F.8090202@enterprisedb.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Please keep the list cc'd so that others can help.
Yinan Li wrote:
> What version of Postgres are you using?
> 8.2.4
> How much RAM does the box have?
> 2G
> How big is the table?
> 256M tuples, each tuple contains 2 integers.
> How long does the index build take?
> About 2 hours
> What kind of an I/O system do you have?
> A SATA disk (7200 rpm)
2 hours does sound like a very long time. With a table like that, we're
talking about ~7-9 GB worth of data if I did the math right.
You could try lowering shared_buffers to something like 50 MB while you
build the index, to leave more RAM available for OS caching.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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