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Data Modeling

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20 questions
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  • Q1
    In Power BI, how can you optimize a data model with a large number of rows for performance?
    Use a flat file structure
    Use DirectQuery mode
    Increase the size of the data model
    Disable data refresh
    120s
  • Q2
    What is the primary benefit of using calculated columns in a Power BI data model?
    To directly update the source database
    To improve data import speed
    To perform row-level calculations in the data model
    To replace measures in the data model
    120s
  • Q3
    Which of the following relationships should be avoided to optimize the performance of a Power BI data model?
    One-to-Many relationships
    Many-to-Many relationships
    One-to-One relationships
    Hierarchical relationships
    120s
  • Q4
    When dealing with time intelligence in Power BI, which feature should you use to handle complex time-based calculations?
    Custom visuals
    SQL-based calculations
    DAX time intelligence functions
    Power Query transformations
    120s
  • Q5
    What is the purpose of using the 'ALL' function in a DAX expression?
    To create a new calculated column
    To apply filters to the data context
    To remove filters from the data context
    To format the data
    120s
  • Q6
    How can you ensure that a Power BI report is responsive when dealing with large datasets?
    Disable report interactions
    Increase the report page size
    Implement Aggregations
    Use multiple data sources
    120s
  • Q7
    Which method can be used to improve query performance in Power BI by reducing the amount of data loaded?
    Data Gateway
    Data Flows
    Query Folding
    Incremental Load
    120s
  • Q8
    What is the primary use of the 'RELATED' function in DAX?
    To join two tables
    To filter data
    To calculate a new measure
    To fetch values from a related table
    120s
  • Q9
    How can you reduce the size of a Power BI data model?
    Add more calculated columns
    Remove unused columns and tables
    Use more complex DAX functions
    Increase the number of visuals
    120s
  • Q10
    Which of the following is a best practice when creating hierarchies in Power BI?
    Only use hierarchies for time-based data
    Avoid using hierarchies to keep the model simple
    Create as many hierarchies as possible
    Include all levels of granularity needed for analysis
    120s
  • Q11
    What is the effect of enabling 'Auto Date/Time' for new files in Power BI?
    It disables manual date/time calculations
    It creates hidden date tables for each date field
    It automatically updates the data source
    It formats the date fields in the report
    120s
  • Q12
    Which DAX function is used to calculate a running total in Power BI?
    SUMMARIZE
    SUMX
    TOTALYTD
    CALCULATE
    120s
  • Q13
    How do you create a measure in Power BI that dynamically changes based on user selections?
    Adjust the data source query
    Use Power Query to create dynamic tables
    Create a calculated column
    Use DAX functions like SWITCH and SELECTEDVALUE
    120s
  • Q14
    What is the primary advantage of using Power BI Dataflows?
    To improve visualization performance
    To create advanced custom visuals
    To directly edit the data model
    To enable data reuse and consistency across multiple reports
    120s
  • Q15
    What should be done to ensure that the Power BI model relationships are correctly defined?
    Avoid creating relationships
    Rely on Power BI service settings
    Use only automated relationship detection
    Regularly review and validate relationships
    120s

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