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troyhimes's avatar
troyhimes
Resolver I
2 years ago

DB2, Incremental Refresh, Query Folding Basics

Hello, I am querying a DB2 db but fails every so often due to a time out error.  I've never used incremental refresh but understand that this would probably be a solution and that query folding is r...
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Anonymous's avatar
Anonymous
Not applicable
2 years ago

Hi troyhimes 

Based on your descriprion, you can refer to the following link about the query folding.

Query folding examples in Power Query - Power Query | Microsoft Learn

Understanding query evaluation and query folding in Power Query - Power Query | Microsoft Learn

And if you  want to find which steps are preventing your query from folding, you can use the query folding indicators  to check, you can refet to the following link.

Query folding indicators in Power Query - Power Query | Microsoft Learn

And you can refer to the following link to know more about incremental refresh.

Incremental refresh for semantic models and real-time data in Power BI - Power BI | Microsoft Learn

 

Best Regards!

Yolo Zhu

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

 

  • troyhimes's avatar
    troyhimes
    Resolver I
    2 years ago

    Thanks for the response Yolo ( Anonymous ) and the links.  I had already reviewed all of those in my initial quest.  Any guidance specifically in relation to query folding and Db2?  From the screenshot above query folding is dead at the 'source' step (right click on 'Source', 'View Native Query' is greyed out).  Does it have to do with using the 'Microsoft' driver rather than IBM?  The query doesn't work when using the IBM driver.

    • Anonymous's avatar
      Anonymous
      Not applicable
      2 years ago

      Hi troyhimes 

      Thanks for your quick reply.  After testing, the source step itself is not collapsible, it only acts as a connector to connect to the data source, but in order to ensure that the later steps can be collapsed， you can refer to the following steps:

      1.Make sure that your connect mode is import, don't filter in advanced options. just click ok

       

      2.Select the database , then click 'Transform data'

       

      3.Add a new step in power query , then refer to the following code.

       

      = Value.NativeQuery(xxxx(your database name),"select * from SQLTest",null,[EnableFolding=true])

       

      Then you can find the query folding can use.

      And you can refer to the following video.

      Bing Videos

       

      Best Regards!

      Yolo Zhu

      If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

       

       

       

      • troyhimes's avatar
        troyhimes
        Resolver I
        2 years ago

        Thanks Yolo (@v-xinruzhu-msft ), we're getting close.  I had previously watched that video too but couldn't get it to work.  I believe it may be something simple in the way I'm writing the command.  Do you see anything that may be causing the issue?