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Former Member

Data Modelling

I have a multi cube which consists of 10 DSO. I want to adapt the model, I see the options as follows. The model is on a BI 7 system and uses DTP and Transformation for loading, most of the DSO have different Key fields

1. AS IS model

2. Load from DSO to ten cubes and adapt the multi cube to consist of the cubes rather than the DSO. However, what I need to know here would be the advantage of the DSO layer (if we ignore staging) since I can load from PSA to Cube or is there something that I need to be aware of seperately

3. Load all flat files to 1 cube either from DSO or PSA - is this feasible and if so can there be an issue since we are in addition mode when going to the cube

Can someone give there thoughts and suggestions otherwise

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2 Answers

  • author's profile photo Former Member
    Former Member
    Posted on Nov 14, 2007 at 10:13 PM

    Nitin,

    I wouldn't suggest the as is model for obvious reasons. Loading into 10 cubes is going to be a better option from slice and dice point of view. If you still want to access the data from DSO, you can create jump targets if your cubes happen to be missing any objects. Other than that, i don't see any reason to have the DSOs if you are loading data from flat files. You may directly load data to the cubes. Loading all the the flat files to cube may not be a bad idea, however, it depends on the size of data in those files, but you need to have a DSO for this if you want to have delta loads.

    Hope it helps.

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  • author's profile photo Former Member
    Former Member
    Posted on Nov 15, 2007 at 01:34 AM

    Niten, it all depends on your purposes for this data and how it is used to determine how you should model it. Combining ten DSOs with a MultiProvider has potential performance issues, not to mention a lack of flexibility in reporting on the data. At the same time, you may not need 10 cubes (one for each DSO) to meet your reporting needs - you might need three cubes that combine the data from the DSOs for specific reporting purposes. Further, you may not need 10 DSOs to begin with - it all depends on how the data fits together, how much space it requires, how many fields in each DSO, reporting requirements, performance, etc. This is a much more complex question to answer than the level of details provided.

    Hope this provides you with some direction - without knowing more of the details.

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    • Former Member

      Thanks very much for this. If we look at it on a high level and ignore staging gains could we say that the decision to have the DSO layer would be on whether the key figures are updated in overwrite (keep DSO layer) or addition (no need for DSO layer)

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