How to configure Level Number of Elements in Dimensional Hierarchies?

http://gerardnico.com/wiki/dat/obiee/bi_server/design/dimension/level_number_dimension
Above mentioned link mentions the value to be placed in Level Number of Elements in Dim Hierarchies.But being New to Obiee I am unable to understand.I would appreciate if So one explains in detail.Example would be better.
Thanks in advance for the cooperation.
Edited by: user8655160 on Jul 23, 2009 11:46 AM

Query optimization is based on the order of the tables in the FROM clause of the generated SQL. Tables with many rows appear before tables with fewer rows. This order can be important especially for RDBMS that lack an optimizer feature.
It's no more the case with the actual databases.
Example for Oracle : Query optimizer
http://gerardnico.com/wiki/database/oracle/query_optimizer/start
By modifying the number of element, you can change their order in the FROM clause but I never test it.
Cheers
Nico

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Acquire Response1.jpg ‏266 KB
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