Re: Increasing pattern index query speed

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От Andrus
Тема Re: Increasing pattern index query speed
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Msg-id B0DF162C81E84748A71F9FA153ED7BA2@andrusnotebook
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Ответ на Re: Increasing pattern index query speed  (Richard Huxton <dev@archonet.com>)
Ответы Re: Increasing pattern index query speed  (Richard Huxton <dev@archonet.com>)
Re: Increasing pattern index query speed  ("Andrus" <kobruleht2@hot.ee>)
Список pgsql-performance
Richard,

> And the results were?

Results are provided in bottom of the message to which you replied.

> One problem at a time. Let's get the pattern-matching speed problems on
> your live server sorted, then we can look at different queries.

First message in this thread described the issue with query having
additional condition

AND dok.kuupaev BETWEEN '2008-11-21' AND  '2008-11-21'

It seems that this problem occurs when pattern matching and BETWEEN
conditions are used in same query.

According to Scott Garey great recommendation I added

ALTER TABLE rid ALTER COLUMN toode SET STATISTICS 1000;

This fixes testcase in live server, see my other message.
Is it OK to run

ALTER TABLE rid ALTER COLUMN toode SET STATISTICS 1000

in prod database or should I try to decrease 1000 to smaller value ?
rid is big increasing table and is changed frequently, mostly by adding
rows.

Andrus.


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