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see ORA-12699
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-none-

-none-

2004-08-31       - By -not available-

Reply:     <<     171     172     173     174     175     176     177     178     179     180     >>  

I 'll defer to Lex and others for a more definitive response.


Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
* Nullius in verba *

Upcoming events:
- Performance Diagnosis 101: 9/14 San Francisco, 10/5 Charlotte, 10/26
Toronto
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- Visit www.hotsos.com for schedule details...


-- --Original Message-- --
From: oracle-l-bounce@(protected) =
[mailto:oracle-l-bounce@(protected)]
On Behalf Of Barr, Stephen
Sent: Tuesday, August 31, 2004 10:04 AM
To: Oracle-L@(protected)
Subject: Outer Joins are Evil?

I 'm currently working on a datawarehouse project (~5 Tb) where the =
decision
has been made to avoid performing outer joins.
=20
The reasons given for this seem to be -
=20
1.   Simplifies user navigation of the structures - i.e. avoids outer
joins.=20
2.   Outer joins are slow and should be avoided at all costs.=20
3.   If an FK is missing it is populated with a default value which will
relate to an actual row in the target table, hence no rows will ever be
dropped - again, supposedly this is to simply SQL and avoid outer joins. =

=20
What they actually do is populate each table in the structure with three
default rows with an SK of 0, 1 & 2. Any FK 's which are missing, not
applicable or invalid will point to one of these rows.
=20
Now....my question is....what is so inherently evil about outer joins =
that
we go to this extreme to avoid them?
=20
AND...has anyone else seen something like this deployed in other places?
=20
Thanks,
=20
Steve.
=20
=20
=20

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