The old and new versions were both set to CHOOSE.  Both are analyzed.
Are you saying 8.1.7 handles this differently?

Thanks!
Ron

-----Original Message-----
Sent: Monday, August 11, 2003 3:04 PM
To: Multiple recipients of list ORACLE-L
to 8.1.7


RBO, CBO, the old story. If you plan to continue using 8.1.7 for a
While, then set the parameter OPTIMIZER_MODE to RULE. Your performance
will be normal again and programmers will be able to override the
parameter By specifying any hint except /*+ RULE */. Before switching to
CBO, please read the article about the intelligent life in the
optimizer. The article 
itself is a good one (thanks, Tim) but reading the book from JL
(Jonathan 
Lewis, not Jeniffer Lopez) wouldn't hurt, either.  

--
Mladen Gogala
Oracle DBA 



-----Original Message-----
Smith, Ron L.
Sent: Monday, August 11, 2003 3:14 PM
To: Multiple recipients of list ORACLE-L
8.1.7



We recently upgraded an application (Extempore) database from Oracle
7.3.4 to 8.1.7.  The clients say the test database, still on Oracle
7.3.4 is much faster than the production database, now on 8.1.7.  The
server is newer and faster on the production database.  The Oracle init
parameters are pretty much identical.  

When I access the database through SQL*PLUS or TOAD, the response is
instantaneous.  The app uses an ODBC connection which is also 8.1.7.  I
have tried attaching the tables in MS Access through ODBC.  This too is
instantaneous.

Any ideas?

Ron Smith
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