Can we improve perfromence if we add the dimensions in LTS

hi all
i have one small doubt ,
i heard that if we add dimensions in to the fact in LTS(once u double clikc on the LTS in General tab you can find add button from there u can select all the other dimensions which are connected to the fact table , if we add few dimension to the fact table will it increase the performance??
other wise can any one tel me why we have to add the dimensions ,
if we will not add the dimensions to the fact performance problem will come or not?
Thanks
Sreedhar

Sreedhar,
No the performance will not bump up merely adding a dimension as a new source to logical fact table.
Adding sources will not effect performances.
Adding Summary/Aggregate/Materialized Views(Oracle terminology for summary tables) will bump up performance and specifying exact content information is vital.
Google for Aggregate tables in OBIEE. You will find tons of posts.
Let me know if your are not clarified.
mark answers promptly.
J
-bifacts
http://www.obinotes.com
Edited by: bifacts on Nov 15, 2010 9:53 AM

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