Performance issue... navigational attribute used

hi ,,
if navigational attrributes are used sytem performnce incerases or decreases ?
if so why?
regards
snigdha

Hi
Navigational attributes require additional table joins at runtime (in comparison to dimension characteristics) but usually the decision for dimension characteristics or navigational attributes is based on business requirements rather than on performance considerations. If your aggregates contain navigational attributes, a change run must be scheduled every time this master data is loaded.
Dimensional attributes generally have a performance advantage over navigational attributes for query operations. Fewer tables are joined to access the values of dimensional attributes than navigational attributes; therefore less overhead is seen during query execution. The requirements should be carefully analyzed to determine whether a certain attribute needs to be navigational or if dimensional or display attribute

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