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Data Scheme is a diagrammatic representation that illustrates data structures
and data relationships to each other in the relational database within the data
warehouse................
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Bitmap indexes make use of bit arrays (bitmaps) to answer queries by performing
bitwise logical operations..................
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In hierarchical, networked or relational databases, the data can be extracted,
cleansed and transferred in two directions. The ability of a system to do this
is refered to as bidirectional extracts................
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Data collection frequency is the rate at which data is collected. However, the
data is not just collected and stored. it goes through various stages of
processing like extracting from various sources, cleansing, transforming and
then storing in useful patterns................
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