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Using tabular model perspectives to restrict which tables a user sees
Part two of a two-part series of blogs
Perspectives in SSAS tabular are windows which allow you to control who sees which bits of your model. They're really easy to set up, as this blog shows, but aren't a substitute for setting security roles.
This page shows you how to set up and use perspectives in a tabular model.
Assuming you're editing a model, here's how to create a perspective of it (onto it? over it?). First go into the Perspectives menu:
Choose to create a new perspective from the menu.
Now choose to create a new perspective:
Here we've already created one perspective called Retail expert, and are about to add another.
You can now tick the tables and columns you want to be visible in your new perspective, as well as giving it a name:
Here we're letting biologists view the classification of products bought, but that's about all.
When you've finished, select OK.
There's a drop down menu on the main SSAS toolbar which allows you to change perspective for a model:
Simply click on the drop arrow and choose to view one of the perspectives that you've created.
Note that if you didn't include id fields in your perspective, your tables would now appear unrelated:
How the tables would appear if you'd unticked the id fields when creating the Biologist perspective.
However, the id fields (and relationships between them) are still part of your model, so that you'll still get sensible pivot tables based on it:
Even though you can't see the id columns or the relationships joining them, they still form part of your model, allowing you to aggregate data correctly.
When you create a pivot table from SSAS tabular, you can choose the perspective:
Choose from the drop down list who you want to be!
Excel displays only those tables and columns which are:
Here's what you'd see for our Biologist perspective:
You can only see columns which are included in the perspective and which aren't hidden from client view.
If you have a connection (for example, in Excel), you can change which perspective it uses as follows. First display the connection you want to change:
In Excel you'd first choose to click on this tool on the Data ribbon.
Choose to change the properties of this connection:
Click on this button to change the properties of your connection.
You can now fill in the dialog box which appears as shown below:
Step 1: click on the Definition tab; Step 2: type in a valid perspective name; Step 3: select OK.
Note that you can also type in the command text as the word Model, to revert to viewing everything.
If you're in Management Studio browsing a tabular model, you can change which perspective you're using too:
Click on the build button next to the word Model, as shown above.
You can then select the perspective that you want to show:
Choose which of the perspectives you've created that you want to use.
And that's about everything you can do with perspectives. I really like the way Microsoft have implemented them: nice and simple, which is always a good thing in software.
|Parts of this blog|
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