Re: Identical Queries

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От Stephan Szabo
Тема Re: Identical Queries
Дата
Msg-id 20070301112948.R45862@megazone.bigpanda.com
обсуждение исходный текст
Ответ на Identical Queries  (Rob Schall <rschall@callone.net>)
Ответы Re: Identical Queries  (Rob Schall <rschall@callone.net>)
Список pgsql-performance
On Thu, 1 Mar 2007, Rob Schall wrote:

> Question for anyone...
>
> I tried posting to the bugs, and they said this is a better question for here.
> I have to queries. One runs in about 2 seconds. The other takes upwards
> of 2 minutes. I have a temp table that is created with 2 columns. This
> table is joined with the larger database of call detail records.
> However, these 2 queries are handled very differently.

How many rows are there in anitmp and how many rows in anitmp have
istf=true and how many have istf=false? If you don't currently analyze the
temp table after adding the rows, you might find that doing an analyze
helps, or at least makes the row estimates better.

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