Re: Optimizing a huge_table/tiny_table join
От | Joshua D. Drake |
---|---|
Тема | Re: Optimizing a huge_table/tiny_table join |
Дата | |
Msg-id | 4475090C.6010303@commandprompt.com обсуждение исходный текст |
Ответ на | Optimizing a huge_table/tiny_table join (<kynn@panix.com>) |
Список | pgsql-performance |
> kj > > PS: FWIW, the query plan for the query with LIMIT 6000 is this: What is the explain analyze? > > QUERY PLAN > ------------------------------------------------------------------------------------- > Limit (cost=19676.75..21327.99 rows=6000 width=84) > -> Hash Join (cost=19676.75..1062244.81 rows=3788315 width=84) > Hash Cond: (upper(("outer".id)::text) = upper(("inner".id)::text)) > -> Seq Scan on huge_table h (cost=0.00..51292.43 rows=2525543 width=46) > -> Hash (cost=19676.00..19676.00 rows=300 width=38) > -> Seq Scan on tiny_table t (cost=0.00..19676.00 rows=300 width=38) > > ------------=_1148485808-20617-3-- > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: Have you checked our extensive FAQ? > > http://www.postgresql.org/docs/faq > -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensive PostgreSQL solutions since 1997 http://www.commandprompt.com/
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