Preaggregation through value according to size of the hierarchy in 11g

Hi all



I created a cube with 6 dimensions in olap 11g. One of these six dimensions has only a single hierarchy which is based hierarchy. I chose the level based aggregation I know what exactly users go to the query. When I was going through the dimensions to choose the levels of preaggregating I noticed there was that no option available for my value based hierarchy dimension (I could see the option 'all' for the same case in 10 g) then I tried to look for the definitions of the underlying objects in order to ensure that it will be preaggregating in my dimension hierarchy of value according.

I found the value that my value according to size of the hierarchy in object < NAME of the CUBE >SOLVEAGGMAP AWM uses to decide what values of dimension of preaggregating but if I rpr on this set of value (rp r < NAME of the CUBE >SOLVE< NAME of DIMENSION > _PVSET), it shows NA, so my question is what can I pre aggregation through dimension hierarchy according to value in olap 11 g?

OLAP Version: 11.2.0.1
AWM version: 11.2.0.1

Thank you

Even if you know exactly what levels your users ask, pre-calculate the base per cent (30%) may still be faster in practice, because queries are returned, use the "sparse loopback" instead of "dense closure." It was the biggest advantage of unique performance of 11g over 10g.

But if you want to continue using the base level precompute, then you should look at the XML model for the cube (as recorded by AWM, for example). Inside, you should find what we call PrecomputeCondition. This defines the set of members that are precalculated. Here is an example that I just created using the GLOBAL schema


 

The PrecomputeCondition is also visible in the USER_CUBES view.

SELECT PRECOMPUTE_CONDITION
FROM USER_CUBES
WHERE CUBE_NAME = 'MY_CUBE';

You can change this condition in the XML to specify an alternative 'level unfounded' precompute condition for any dimension. For example, if you set an attribute named "SHOULD_PRECOMPUTE" on your PRODUCT dimension which is 1 for members to be precalculated and 0 for all others, you can change the condition as follows.


 

If you recreate the cube from the XML with this condition, then the PVSET valueset that you discovered should contain all the dimension members for which the value of the attribute is 1.   This gives you complete control over what is precalculated.   Note that AWM does not support this form of State, so it will not be displayed if you go to the Precompute tab, but it is valid for the server.  The PL/SQL below will change the PrecomputeCondition (for the cube named MYCUBE) without going through MN.

begin
  dbms_cube.import_xml(q'!

  
    
      
        
          
        
      
    
  

!');
end;
/

Tags: Business Intelligence

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