Analytics Queries

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Analytics Queries
In Open Data Blend Analytics, any query that is submitted as DAX or MDX is considered an Analytics Query and counts towards your usage allowance.
​
DAX Queries
​Data Analysis Expression (DAX) queries look like the following example.
DEFINE
    VAR __DS0Core =
        SUMMARIZECOLUMNS (
            'Anonymised MOT Test Result Info'[Test Postcode Area Name],
            "Anonymised_MOT_Test_Results", 'Calculation'[Anonymised MOT Test Results]
        )
    VAR __DS0PrimaryWindowed =
        TOPN (
            1001,
            __DS0Core,
            [Anonymised_MOT_Test_Results], 0,
            'Anonymised MOT Test Result Info'[Test Postcode Area Name], 1
        )
EVALUATE
__DS0PrimaryWindowed
ORDER BY
    [Anonymised_MOT_Test_Results] DESC,
    'Anonymised MOT Test Result Info'[Test Postcode Area Name]
​
Examples of client tools that can generate these queries are Power BI Desktop and Power BI Report Builder.
​
MDX Queries
​Multidimensional Expression (MDX) queries look like the following example.
SELECT {
         [Measures].[English Prescription Actual Cost],  
         [Measures].[English Prescription Items Total Quantity],  
         [Measures].[English Prescription Items],  
         [Measures].[English Prescription Quantity],  
         [Measures].[English Prescriptions]
       }, 
       NON EMPTY [Prescribing Practice].[Prescribing Practice Code (Source)].[Prescribing Practice Code (Source)].AllMembers ON ROWS 
FROM [Model]
Examples of client tools that can generate these queries are Excel and Tableau Desktop.
​
Generated Queries
Client tools such as Excel, Power BI Desktop, and Tableau Desktop will typically generate one query per visualisation (e.g. charts, graphics, tables, etc). Placing too many visuals on a single dashboard or report page can cause each refresh of the visual display to send several queries to the Open Data Blend Analytics service. This behaviour should be considered when making dashboard and report design decisions.
​
Query Limits
To keep the Open Data Blend Analytics service responsive, we have put some query limits in place.
​
Rows Limit
The number of rows that a single Analytics Query can return is 10,000. Any queries that exceed this limit will automatically be cancelled and return an error to the client tool.
​
Memory Limit
Analytics Queries have a limit placed on the amount of memory that they can consume. Any queries that exceed this limit will automatically be cancelled and return an error to the client tool.
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