what is a junk dimension ?
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Answer Posted / aparna
A junk dimension is a convenient grouping of flags and
indicators. It's helpful, but not absolutely
required, if there's a positive correlation among the
values. The benefits of a junk dimension
include: ? Provide a recognizable, user-intuitive location
for related codes, indicators and their
descriptors in a dimensional framework.
? Clean up a cluttered design that already has too many
dimensions. There might be five
or more indicators that could be collapsed into a single 4-
byte integer surrogate key in
the fact table.
? Provide a smaller, quicker point of entry for queries
compared to performance from
constraining directly on these attributes in the fact
table. If your database supports bitmapped
indices, this potential benefit may be irrelevant, although
the others are still
valid.
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