This is perfectly reasonable (assuming
you are still following my example)
By instructing Oracle that joins INTO
both C and E should be constrained
to nested loop joins, you have stopped
Oracle from calculating E -> C using
a hash join, and therefore stopped it
from finding the hash join with swapped
sides.
Jonathan Lewis
http://www.jlcomp.demon.co.uk
Host to The Co-Operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
Author of:
Practical Oracle 8i: Building Efficient Databases
Screen saver or Life saver: http://www.ud.com
Use spare CPU to assist in cancer research.
-----Original Message-----
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
Date: 17 September 2001 11:03
|Jonathan,
|
|If you haven't droped your test tables yet could you try /*+ USE_NL(c
e) */
|Yeah, sounds strange, but...
|
|SQL> select /*+ use_nl(c e) */
| 2 e.first_name
| 3 , e.last_name
| 4 , c.short_name
| 5 from courses c,employees e
| 6 where e.emp_id = c.dev_id
| 7 /
|
|1018 rows selected.
|
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Author: Jonathan Lewis
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