explain plan is changing ...

From: Gene Gurevich <g_u_r_e_v_i_c_h_at_yahoo.com>
Date: Thu, 13 Sep 2001 10:46:19 -0700
Message-ID: <F001.0038D89D.20010913101030@fatcity.com>

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Hi all:

I have a query, which behaves differently depending on the input data (month/year). I have more than 15month worth of data in the database. The query is completed under 1 minute for the first 13 month, but for the last two months it just doesn't finish. I have cancelled it after 36 minutes. The explain plans are
differ in that the "quick" query uses more hash jonts, while "slow" one utilizes more nested loops. All the tables are analyzed. This must have something to do with the data distribution, but what? Can anyone shed some light onto that?

tia

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Author: Gene Gurevich
  INET: g_u_r_e_v_i_c_h_at_yahoo.com

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