Re: [Q] does outer join cause full table scan?

dba1 mcc wrote:
> 
> We have sql statement outer join two tables.  The join
> columns have index on it.  I use "tkprof" to check it
> and it show full table scan.
> 
> Does outer join cause 'full table scan"?
> 
> Thanks.
> 

Nothing causes something 'per se' with the CBO. What may matter is
whether the column you are outjoining on (ugly expression) is nullable
or not.

-- 
Regards,

Stephane Faroult
Oriole Software
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to:  oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------

Other related posts: