what is a junk dimension ?
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Answer Posted / vamshi
In data warehouse design, frequently we run into a situation where there are yes/no indicator fields in the source system. However, if u keep all those indicator fields in the fact table, not only do we need to build many small dimension tables, but the amount of information stored in the fact table also increases tremendously,
Junk dimension is the way to solve this problem. In a junk dimension, we combine these indicator fields into a single dimension. This way, we'll only need to build a single dimension table, and the number of fields in the fact table, as well as the size of the fact table, can be decreased
The content in the junk dimension table is the combination of all possible values of the individual indicator fields
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