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Whatever TIMESPAN and END_DATE values you need for your ALL_TIMES top member, you have to provide it through source sql-view that is mapped to your TIME dimension. The MAX logic that you are talking about should be in your source sql view.
Then you can maintain your TIME dimension also when you maintain your cube.
Is that what you are asking?
The source we've been using are tables rather than views, I was not entirely sure if views would function as a data source for AWM.
I managed to work around not having a direct column source for All Time, however, by setting All Time's End_Date to TO_DATE('12/31/9999', 'mm/dd/yyyy') and Time_Span to 99999999999. A tad inelegant, but it appears to do the job. If anyone has a more preferable method, please let me know.
Edited by: islan on Jan 30, 2013 11:15 AM
(1). Generally the top node in TIME dimension is just a dummy member, since the cube data does not make any sense for ALL_TIME or ALL_YEARs etc.
For this kind of top node, I always use some dummy date for END_DATE and a dummy number for TIMESPAN.
There is no issue with that. This is how it is supposed to be done.
Having a one top node for each hierarchy is a requirement for reporting, so that if a dimension is not used in a report, then the reporting tool will "LIMIT" that dimension to its top node.
(2). One clarification. You can use table or a sql view as a source to map to a dimension or a cube. I am not sure why you said that you cannot use sql view as a source in AWM.