Re: index not used
От | Litao Wu |
---|---|
Тема | Re: index not used |
Дата | |
Msg-id | 20050421203927.72223.qmail@web30314.mail.mud.yahoo.com обсуждение исходный текст |
Ответ на | index not used (Enrico Weigelt <weigelt@metux.de>) |
Список | pgsql-performance |
If id is PK, the query shoudl return 1 row only... --- Enrico Weigelt <weigelt@metux.de> wrote: > > Hi folks, > > > I'm doing a simple lookup in a small table by an > unique id, and I'm > wondering, why explains tells me seqscan is used > instead the key. > > The table looks like: > > id bigint primary key, > a varchar, > b varchar, > c varchar > > and I'm quering: select * from foo where id = 2; > > I've got only 15 records in this table, but I wanna > have it as > fast as possible since its used (as a map between > IDs and names) > for larger queries. > > > thx > -- > --------------------------------------------------------------------- > Enrico Weigelt == metux IT service > > phone: +49 36207 519931 www: > http://www.metux.de/ > fax: +49 36207 519932 email: > contact@metux.de > cellphone: +49 174 7066481 > --------------------------------------------------------------------- > -- DSL ab 0 Euro. -- statische IP -- UUCP -- > Hosting -- Webshops -- > --------------------------------------------------------------------- > > ---------------------------(end of > broadcast)--------------------------- > TIP 8: explain analyze is your friend > __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/
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