April 2012
Intermediate to advanced
240 pages
5h 16m
English
Content preview from IBM Cognos TM1 Developer's Certification guideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Granularity—the lowest level of time detail required
Granularity is the extent to which a system is broken down into small parts, either the system itself or its description or observation. It is the extent to which a larger entity is subdivided—Wikipedia.
The most common granularities for a time dimension are:
- Month
- Week
- Day
Month—two time dimensions
Cognos TM1 cubes that store data at the monthly level of detail may have one or two time dimensions. If you have two, this would mean that you will have one dimension for the year and one dimension for the month.
Why would you have both a year and a month dimension, in the same cube?
Some of the advantages of separating the year and month into two dimensions include:
- It is easier for year on year comparisons. ...
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