| From: | The Hermit Hacker <scrappy(at)hub(dot)org> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Re: vacuum timings |
| Date: | 2000-01-21 18:45:34 |
| Message-ID: | Pine.BSF.4.21.0001211443480.23487-100000@thelab.hub.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Fri, 21 Jan 2000, Bruce Momjian wrote:
> OK, new timings with -F enabled:
>
> index no index
> 519 same load
> 247 " first vacuum
> 40 " other vacuums
>
> 1222 X index creation
> 90 X first vacuum
> 80 X other vacuums
>
> <1 90 delete one row
> 121 38 vacuum after delete 1 row
>
> 346 344 delete all rows
> 440 44 first vacuum
> 20 <1 other vacuums(index is still same size)
>
> Conclusions:
>
> o indexes never get smaller
this one, I thought, was a known? if I remember right, Vadim changed it
so that space was reused, but index never shrunk in size ... no?
Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy(at)hub(dot)org secondary: scrappy(at){freebsd|postgresql}.org
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