Comments on: Preventing Chasm and Fan Traps!

By: David Lai

David Lai — Fri, 18 Jun 2010 18:15:18 +0000

Yes your explanation says what I was explaining in the article, minus the prevention and example.
Anyhow, adding to the prevention of Chasm Traps, multiple universes can be used to produce a true star schema so that you avoid messy contexts. You can then connect the universes together at the report level.

By: BJF

BJF — Thu, 10 Jun 2010 23:02:38 +0000

This is the best explanation I’ve found so far.

It seems to me that a FAN TRAP or a CHASM TRAP is not defined by the table relationships. The same set of table joins can cause both a Fan Trap and a Chasm Trap, depending on the query and the nature of the data. The real difference between them is: A Fan Trap causes an incorrect increase of records due to a 1-many relationship. A Chasm Trap causes an incorrect limiting of records due to unneeded tables getting pulled into the joins (because of a context).

Correct?

By: Blues

Blues — Wed, 24 Mar 2010 10:13:40 +0000

Pretty neatly explained.

Thanks

By: Sumit

Sumit — Fri, 22 Jan 2010 06:52:25 +0000

Thanks for this information, this clarify lots of doubts,which i was having.
Thanks
Sumit

By: David Lai

David Lai — Tue, 06 Jan 2009 11:55:43 +0000

Sounds good
I will add you to my blogroll

Thanks!

By: Shahid

Shahid — Thu, 01 Jan 2009 11:19:11 +0000

Its really interesting to see details on two BO Specific challenging issues discussed in detail here. I am also blogging on BI and Data Warehousing. If you feel interested I would like to add you to my blogroll, and would like you to do same, please.

Shahid.