Optimization Level never rises during aggregation design

I've recently added a couple of new dimensions to an old SSAS database.   I decided since I added new dimensions I should re-design the aggregations.
I use the aggregation design wizard, and it acts pretty normal for most of the measure groups.
But then I get to the only measure group that connects to my two new dimensions.   This happens to be a very large measure group and it uses 19 different cube dimensions.
When I run the aggregation design wizard on this group, I choose the "until I click stop" option and let it go, and it starts designing aggregations.   The number of aggregations designed keeps going up, and the storage space allocated
keeps going up, but the optimization level stays at 0% the whole time.   After a few minutes it gives up at about 200 aggregations and 6 gigs of space used, and still 0% optimization.
Is there any possible scenario in which this might be expected and normal, or should I be worried?   I've never seen this happen before.
-Tab Alleman

Hi Tab,
If you select the ‘I click Stop’ option and watch the design grow until the estimated size is ridiculously large (maybe over a couple of Gb) you can then get a feeling for how many small aggregations can be built; you can then stop it, reset the aggregations
and then restart using either the ‘Performance Gain’ or ‘Storage Reaches’ option set to an appropriate level.
I would suggest you refer to the following articles regarding best practices and effective to design aggregations in SSAS, please see:
Designing Effective Aggregations in AS2005:
http://cwebbbi.wordpress.com/2006/10/23/designing-effective-aggregations-in-as2005/
Aggregation Design Best Practices:
http://technet.microsoft.com/en-us/library/cc966399.aspx#EBAA
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Regards,
Elvis Long
TechNet Community Support

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