Re: [HACKERS] psql nested queries with 2000+ records

Поиск
Список
Период
Сортировка
От Bruce Momjian
Тема Re: [HACKERS] psql nested queries with 2000+ records
Дата
Msg-id 199803201724.MAA08299@candle.pha.pa.us
обсуждение исходный текст
Ответ на psql nested queries with 2000+ records  (Coronach <coronach@hill-b-073.resnet.purdue.edu>)
Ответы Re: [HACKERS] psql nested queries with 2000+ records  (Coronach <coronach@hill-b-073.resnet.purdue.edu>)
Список pgsql-hackers
>
> I have noted with 2000+ records in a table (using a btree unique index on
> the primary key, btw) performance of a query takes 15+ minutes to respond.
>
> The query is in the structure of this
>
> select foo from bar where foo in (select foo from bar where bazzfoo like
> 'Word%');

Very strange.  15+ minutes?  Wow, that is terrible, even longer than a
sequential scan of the table.  Try EXPLAIN and tell us what it says in
the two cases.

>
> Just reporting a possible bug..
>
> With smaller amounts of records, responce time is within a few seconds.
>
> Other information you might want:
>
> postgres version: 6.3
> os: BSDI 3.1

Same OS here.
--
Bruce Momjian                          |  830 Blythe Avenue
maillist@candle.pha.pa.us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)

В списке pgsql-hackers по дате отправления:

Предыдущее
От: Tom Ivar Helbekkmo
Дата:
Сообщение: Re: [HACKERS] tables >2GB
Следующее
От: Bruce Momjian
Дата:
Сообщение: Re: [HACKERS] tables >2GB