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smpa01
Super User
Super User

How to write queries that can bypass CallbackDataID

I am writing DAX queries with large and multiple tables and the query is internally generating CallbackDataID which is believed to be detrimental to performance.

Is there any way to write a query that can bypass that? @marcorusso 

@AlexisOlson @CNENFRNL @bcdobbs @OwenAuger 

Thank you in advance.

A sample query is attached in the pbix.

 

Base table
| Continent | Country | Province | Value |
|-----------|---------|----------|-------|
| NA        | CA      | AB       | 100   |
| NA        | CA      | AB       | 50    |
| NA        | CA      | ON       | 1000  |
| NA        | CA      | ON       | 20    |
| NA        | CA      | SK       | 400   |
| NA        | CA      | SK       | 4000  |

Desired
| Continent | Country | Province | Value |
|-----------|---------|----------|-------|
| NA        | CA      | AB       | 50    |
| NA        | CA      | ON       | 20    |
| NA        | CA      | SK       | 400   |

 

Query plan

smpa01_0-1671206791313.png

 

 

 

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1 REPLY 1
lbendlin
Super User
Super User

Have you read this ? Formula engine and storage engine in DAX - SQLBI

or this Performance Issue In DAX Studio: CallBackDataID - Enterprise DNA

 

Here is a version that doesn't use CallbackDataID:

 

Table 3 = summarize('Table','Table'[Continent],'Table'[Country],'Table'[Province],"mv",min('Table'[Value]))
 
No idea how it behaves for larger tables.  Getting the minimum value for a group of columns may always be costly.

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