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Periodic snapshot analysis

nick_scott
New Contributor III

Periodic snapshot analysis

Periodic snapshot analysis

There are only 3 categories of fact table [ref. Kimball: transaction, periodic snapshot & accumulating snapshot].  The analysis of periodic snapshot tables is straight forward, as long as the analysis recognizes that the facts are only "semi-additive".

There seems to be relatively little available on the Community relating to analysis of periodic snapshots, so I have put together an example.

Any analysis of a periodic snapshot requires to reference the "snapshot period" (census [measurement] date) {see: comment about semi-additive nature}, and this can be achieved in one of two ways:

  • As Of Date calendar & Analysis Flags; or
  • Set Analysis.

There are advantages and disadvantages of each approach, and you may find yourself more comfortable with one than the other.

I tend to adopt the Set Analysis approach and I'd welcome any thoughts on the relative benefits.

Explore & Enjoy,

Nick Scott.

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vikasmahajan
Esteemed Contributor

great article

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‎2016-04-06 07:02 AM
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