Alexandre Stephane gave you an excellent reply. If you want to learn more about these DW design issues, I would start by visiting http://www.ralphkimball.com. He is one of the leading figures in the DW field, and has copies of all his articles posted on his site. I would start with the oldest articles because those are where he discusses the fundamentals of data warehousing.
Dennis Williams DBA Lifetouch, Inc. [EMAIL PROTECTED] -----Original Message----- Sent: Tuesday, October 08, 2002 3:29 AM To: Multiple recipients of list ORACLE-L Stéphane, Thanks for response. > I have always discplined myself to use star schema and > never snowflake. Would you mind asking why? > The "Which one is easier to implement and easier ETL > ?" is not a good question as your data model should > not be design for the ETL procecess but only for the > querying. I mean ETL to load data _INTO_ data warehouse. Of course, complexity is mostly determined by sources, but still I'd like to know if there is any general influence by DW's data model. Another question. Is it feasible to make date dimension or just use date column? For example, Oracle Discoverer can work with date columns using hierarchies Y->M->D and similar. What is faster: separate table for date dimension or date column? If I go with date dimension table should I use date column as a foreign key in fact table or use some artificial key? TIA, Alexandre -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Alexandre Gorbatchev INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: DENNIS WILLIAMS INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
