RE: Win2000/8.1.7.3.0/SQL

John:

That makes perfect sense in view of the fact that only the /*+ RULE */ hint makes the query run. I'm not gonna try and find the root cause any more; I've modified my queries and I get answers again.

My Thanks to all who have helped me with this issue.

Cheers,
Mike

-----Original Message-----
Sent: Tuesday, August 20, 2002 1:24 PM
To: Multiple recipients of list ORACLE-L

Mike,

> Ok...this is strange. The optimizer_mode is set to RULE, but if
> I put a RULE hint into the SQL it runs OK. I tried increasing

This is almost clearly a case of the CBO being forced for whatever reason. And there are many :( Cut and paste from the Fine Manual (Oracle 8i Designing and Tuning for Performance). See the last 'Note:' :)

The Optimizer 4-19
Features that Require the CBO
The use of any of the following features requires the use of the CBO: n Partitioned tables
n Index-organized tables
n Reverse key indexes
n Function-based indexes
n SAMPLE clauses in a SELECT statement
n Parallel execution and parallel DML
n Star transformations
n Star joins
n Extensible optimizer
n Query rewrite (materialized views)
n Progress meter
n Hash joins
n Bitmap indexes
n Partition views (release 7.3)
Note: Even if the parameter OPTIMIZER_MODE is set to RULE, the use of these features enables the CBO.

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