Volker:
If optimizer_mode = 'choose', then the optimizer chooses between
cost-based optimization and rule-based optimization based on whether or
not statistics are present. In your case, since they aren't it's using
rule-based.
-----Original Message-----
Volker
Sent: Thursday, August 16, 2001 4:46 AM
To: Multiple recipients of list ORACLE-L
Hi list,
a quick question about oracle optimizer.
a customer has database migrated from 7.3.4 to 8.1.6 on AIX. Data was
transfered via full exp/imp. After migration the performance of the new
database is very poor. I looked at the parameters and saw that no object
is analyzed. So now me question:
What does oracle optimizer do, if there are no statistics on all
objects. Optimizer level is choose.
Volker Sch�n
E-Mail: mailto:[EMAIL PROTECTED]
http://www.inplan.de
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Author: Schoen Volker
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