Why do we put similar infoobjects into single dimension.

Why do we put similar infoobjects(Char ex: 0material, 0matl_type, 0matl_group, 0matl_cat,  0mat_plant) into single dimension(MATERIAL DIMENSION). and other similar like(0CUSTOMER, 0SHIP_STCK, 0SOLD_TO, 0DIVISION, ZORD_MAT) into single dimension(CUSTOMER DIMENSION), What will happen if i put all these infoobjects into single Dimension, Can some one answer me in the system prospect, data base prospect  as well as performace point of view or may in general.
Points will be given.............. thats what u definitely deserve for a right answer.

Santosh,
This is an important thing while deciding upon the dimensions. Its not the similar things we are putting together but based on the data realtion and cardinality we put the chars in a dimension. If dimensions are not properly designed the tables size increases drastically and lead to poor performance. Taking an example the relation between the chars in a dimension should be 1:m and not n:m. A material can have one material type and belons to one materila group for a plant is the relation which is a 1:n relation. Chars with high cardinality are put in separate dimensions instead of grouping with other chars.
The grouping of classification groups (characteristics) whose content is logically connected, under a single generic term. If the dimension contains a characteristic whose value already uniquely determines the values of all other characteristics from a business-orientated viewpoint, then the dimension is named after this characteristic.

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