Re: GEQO status?
От | Ed Loehr |
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Тема | Re: GEQO status? |
Дата | |
Msg-id | 3A43E97E.26469F66@austin.rr.com обсуждение исходный текст |
Ответ на | GEQO status? (Ed Loehr <eloehr@austin.rr.com>) |
Ответы |
Re: GEQO status?
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Список | pgsql-hackers |
Thomas Lockhart wrote: > > > What is the status of the genetic algorithm query optimizer? Is this > > supposed to work well on many-table joins, or has it fallen out of favor > > or in disrepair? [I'm needing to optimize some large, many-table-join > > queries and wondering time spent configuring/understanding geqo would be > > fruitful...] > > It is the only techique we have to achieve adequate performance on > many-table joins. It has received little work recently, but that may be > due to having received no complaints or discussions that I can recall. At risk of being off-topic here, is there a reason why GEQO is off by default in the ODBC driver (postdrv.exe)? I vaguely recall something about this from a year ago, but can't find it. Regards, Ed Loehr
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