Re: [GENERAL] contrib/plantuner - enable PostgreSQL planner hints

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От Bruce Momjian
Тема Re: [GENERAL] contrib/plantuner - enable PostgreSQL planner hints
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Msg-id 200910091702.n99H2CM27713@momjian.us
обсуждение исходный текст
Ответ на contrib/plantuner - enable PostgreSQL planner hints  (Oleg Bartunov <oleg@sai.msu.su>)
Ответы Re: [GENERAL] contrib/plantuner - enable PostgreSQL planner hints  (Oleg Bartunov <oleg@sai.msu.su>)
Re: Re: [GENERAL] contrib/plantuner - enable PostgreSQL planner hints  (Teodor Sigaev <teodor@sigaev.ru>)
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Oleg Bartunov wrote:
> =# set enable_seqscan=off;
> =# set plantuner.forbid_index='id_idx2';

The genius of this module is the line above -- a more fine-grained way
to control the optimizer, with specific index disabling.

> =# explain select id from test where id=1;
>                                QUERY PLAN
> ----------------------------------------------------------------------
>   Bitmap Heap Scan on test  (cost=4.34..15.03 rows=12 width=4)
>     Recheck Cond: (id = 1)
>     ->  Bitmap Index Scan on id_idx  (cost=0.00..4.34 rows=12 width=0)
>           Index Cond: (id = 1)
> (4 rows)

Are you planning to submit this as a /contrib module?

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +


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