| From: | "Hiroshi Inoue" <Inoue(at)tpf(dot)co(dot)jp> |
|---|---|
| To: | "Bruce Momjian" <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | "PostgreSQL-development" <pgsql-hackers(at)postgreSQL(dot)org>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | RE: [HACKERS] vacuum timings |
| Date: | 2000-01-21 06:46:15 |
| Message-ID: | 000201bf63db$36cdae20$2801007e@tpf.co.jp |
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| Lists: | pgsql-hackers |
> -----Original Message-----
> From: owner-pgsql-hackers(at)postgreSQL(dot)org
> [mailto:owner-pgsql-hackers(at)postgreSQL(dot)org]On Behalf Of Bruce Momjian
>
> I loaded 10,000,000 rows into CREATE TABLE test (x INTEGER); Table is
> 400MB and index is 160MB.
>
> With index on the single in4 column, I got:
> 78 seconds for a vacuum
vc_vaconeind() is called once
> 121 seconds for vacuum after deleting a single row
vc_vaconeind() is called twice
Hmmm,vc_vaconeind() takes pretty long time even if it does little.
> 662 seconds for vacuum after deleting the entire table
>
How about half of the rows deleted case ?
It would take longer time.
Regards.
Hiroshi Inoue
Inoue(at)tpf(dot)co(dot)jp
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