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08.24.2007 at 02:33AM PDT, ID: 22784556
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8.0

Microsoft, Analysis Services, 2005, Date dimension with granuality of seconds

Asked by aaarrrgggghhh in OLAP, MS SQL Server

Tags: , , , ,

Hi,

I'm using Microsoft SQL Server 2005 Analysis Services and have a problem with creating a date dimension.

I have a requirement that my Date dimension goes down to a granuality of seconds. So there is a hierarchy going

Year -> Month -> Date -> Hour -> Minute -> Second.

Clearly this leads to a rather large dimension. Even just one year of data has 31,536,000 members.

I've read recomendations of splitting this up into two dimensions, a Date dimension with granuality of Day and a Time dimension with granuality of Seconds.

E.g.

Year -> Month -> Day
Hour -> Minute -> Second

This works fine for me in most situations, however I'm have difficulties with Semi Additive aggregations.

I have tried setting both of these dimensions to type Time, however when using Semi Additive aggregations such as AverageOfChildren or LastChild, the Semi Additive part only seem to apply to one of the two Time dimension.

Is it possible to get the Semi Additive behaviour to apply to both dimensions? If not are there any other approaches I can take for having a Date dimension with granuality of seconds?

Any general comments would be welcome.
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[+][-]09.18.2007 at 07:08AM PDT, ID: 19912857

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About this solution

Zones: OLAP, MS SQL Server
Tags: dimension, analysis, services, 2005, date
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Solution Provided By: PFrog
Participating Experts: 1
Solution Grade: A
 
 
[+][-]10.15.2007 at 03:10AM PDT, ID: 20076818

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