Re: Performance of column order

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От Bruce Momjian
Тема Re: Performance of column order
Дата
Msg-id 200204181527.g3IFRxL09772@candle.pha.pa.us
обсуждение исходный текст
Ответ на Performance of column order  (Egon Sommer <Service@Sommer-Maschinenbau.de>)
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Egon Sommer wrote:
> Hallo!
>
> Do anybody know if the order of the columns in a table has affect
> on the performance?
>
> Should I use length-variable colums like TEXT, BLOB,... alfter
> length-static colums like INTEGER, BOOLEAN, ...?

It is very slightly faster to have variable length stuff after fixed length
fields.

> Is there a advantage to create a separate table for BLOBS and
> TEXT joining the main table about a primary key?

Probably, though TOAST stores large stuff in backup tables anyway, so
there is probably little difference.

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
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