Top 10 records in MDX

Question

How to get top 10 records from below query? This query is throwing Out of Memory exception.

SELECT 
  [Build].[Build ID] ON 0
 ,
    [Build].[Build Definition Name].MEMBERS*
    [Build].[Build].MEMBERS*
    [Build].[Build Start Time].MEMBERS*
    [Build Status].[Build Status] ON 1
FROM Build

Answer 1

This is exactly the same as Sourav's answer but slightly simpler without the creation of the custom set:

SELECT 
  [Build].[Build ID] ON 0
 ,TopCount
  (
      [Build].[Build Definition Name].MEMBERS*
      [Build].[Build].MEMBERS*
      [Build].[Build Start Time].MEMBERS*
      [Build Status].[Build Status]
   ,10
  ) ON 1
FROM Build;

I've just tested against AdvWrks as I'm interested in your error message.

This script takes 11 seconds on my machine with a warm cache:

SELECT [Measures].[Internet Order Quantity] ON 0,
NON EMPTY

[Date].[Date].MEMBERS
*
[Product].[Subcategory].MEMBERS
*
[Geography].[Country].MEMBERS
*
[Customer].[Gender].MEMBERS

ON 1
FROM
[Adventure Works]

Whereas this is instantaneous:

SELECT [Measures].[Internet Order Quantity] ON 0,
NON EMPTY
TOPCOUNT(
  [Date].[Date].MEMBERS
  *
  [Product].[Subcategory].MEMBERS
  *
  [Geography].[Country].MEMBERS
  *
  [Customer].[Gender].MEMBERS
, 10
)
ON 1
FROM
[Adventure Works]

Your error is probably because it is trying to return and render a very big table in your results panel.

Answer 2

As per MSDN , you get the top-N values using TOPCOUNT function, whose definition is

TopCount(Set_Expression,Count [ ,Numeric_Expression ] )

You want the top 10 based on what? In absense of any measure, it will get you the top 10 based on the default measure.

WITH SET TOP10BuildID
AS

TopCount(([Build].[Build ID].MEMBERS*
    [Build].[Build Definition Name].MEMBERS*
    [Build].[Build].MEMBERS*
    [Build].[Build Start Time].MEMBERS*
    [Build Status].[Build Status]),10)


SELECT 
  TOP10BuildID ON 0
  [Measures].SomeMeasure 
 ON 1
FROM [Build]