Re: CBO irregularity

  • From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 8 Jun 2004 09:58:04 +0100

Note in-line


Jonathan Lewis
The Co-operative Oracle Users' FAQ
Optimising Oracle Seminar - schedule updated May 1st

----- Original Message ----- 
From: <chris@xxxxxxxxxxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Tuesday, June 08, 2004 9:39 AM
Subject: Re: CBO irregularity

: PS Even doing this I've had 1 or 2 cases where the execution plan
generated by
: the stored proc was different from what happened in live. Couldn't fully
: explain it must have been an optimizer funny. BTW it wasn't the
: = choose always used by PL/SQL" "feature" that we had to endure up until,
9i I
: believe.

The change appeared in 8.1.6 with the default for a hidden parameter:

_optimizer_mode_force = true  in 8.1.6
_optimizer_mode_force = false in 8.1.5

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