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increasing collapse_limits?

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: increasing collapse_limits?
Date: 2011-04-30 16:16:13
Message-ID: BANLkTin4ncKMg+bEixi1WB1RJPrZ5dVRgQ@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Hello

Actually we had to solve a issue with slow SELECT. The problem was in
low value of JOIN_COLLAPSE_LIMITS. Can we increase a default of this
value. I checked some complex query, and planner needed about 200ms
for JOIN_COLLAPSE_LIMIT = 16. So some around 12 can be well.

Regards

Pavel Stehule

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