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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Using dimensions
Raj - Actually a good place to start is the Oracle9i Data Warehousing Guide
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96520/logical.
htm#97703
<http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96520/logical
.htm#97703>
I think it is important for all Oracle DBAs to understand the fundamental
concepts behind DW. You never know when you'll get yanked into a meeting
where they are discussing it and you don't want to say something Neanderthal
like "of course we'll fully normalize the schema". Ralph Kimball has some
good materials on his web site: http://www.ralphkimball.com
<http://www.ralphkimball.com>
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Monday, September 29, 2003 11:15 AM
To: Multiple recipients of list ORACLE-L
Thanks Scott, okay lets forget OLTP .. but I haven't seen any _actual_ uses of dimensions ... where does one use them? in SQLs?
I have scanned TFM, but haven't STFW'd yet ... scared of too many hits.
Thanks
Raj
-----Original Message-----
Sent: Monday, September 29, 2003 11:55 AM
To: Multiple recipients of list ORACLE-L
Dimensions are data warehouse constructs. They are implemented as tables in the database, but have the characteristic of a hierarchy that can be traversed. For example: a time dimension can have the hierarchy of date, day, week, month, quarter, year, decade, century. This is used for rollup reporting within the data mart. I don't see any good use of it in an OLTP environment, but I may be wrong.
Scott Canaan (srcdco_at_rit.edu)
(585) 475-7886
"Life is like a sewer, what you get out of it depends on what you put into it." - Tom Lehrer.
-----Original Message-----
Sent: Monday, September 29, 2003 10:55 AM
To: Multiple recipients of list ORACLE-L
I have tried, but haven't found a good example of how to _use_ a dimension in 9ir2. I defined one, but then sat clueless on what to do with it. Is it any good in an OLTP environment? (I smell the answer is a NO, but still) ...
Any notes from your experience?
TIA
Raj
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: DENNIS WILLIAMS INET: DWILLIAMS_at_LIFETOUCH.COM Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting servicesReceived on Mon Sep 29 2003 - 13:24:39 CDT
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