Обсуждение: improve docs on min()/max() performance
This patch adds a note to the documentation describing why the performance of min() and max() is slow when applied to the entire table, and suggesting the simple workaround most experienced Pg users eventually learn about (SELECT xyz ... ORDER BY xyz LIMIT 1). Any suggestions on improving the wording of this section would be welcome. Cheers, Neil -- Neil Conway <neilc@samurai.com> || PGP Key ID: DB3C29FC
Вложения
Your patch has been added to the PostgreSQL unapplied patches list at:
http://momjian.postgresql.org/cgi-bin/pgpatches
I will try to apply it within the next 48 hours.
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Neil Conway wrote:
> This patch adds a note to the documentation describing why the
> performance of min() and max() is slow when applied to the entire table,
> and suggesting the simple workaround most experienced Pg users
> eventually learn about (SELECT xyz ... ORDER BY xyz LIMIT 1).
>
> Any suggestions on improving the wording of this section would be
> welcome.
>
> Cheers,
>
> Neil
> --
> Neil Conway <neilc@samurai.com> || PGP Key ID: DB3C29FC
>
>
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>
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--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
Patch applied. Thanks. --------------------------------------------------------------------------- Neil Conway wrote: > This patch adds a note to the documentation describing why the > performance of min() and max() is slow when applied to the entire table, > and suggesting the simple workaround most experienced Pg users > eventually learn about (SELECT xyz ... ORDER BY xyz LIMIT 1). > > Any suggestions on improving the wording of this section would be > welcome. > > Cheers, > > Neil > -- > Neil Conway <neilc@samurai.com> || PGP Key ID: DB3C29FC > > [ Attachment, skipping... ] > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073