
Data Modeling
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20 questions
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- Q1In Power BI, how can you optimize a data model with a large number of rows for performance?Use a flat file structureUse DirectQuery modeIncrease the size of the data modelDisable data refresh120s
- Q2What is the primary benefit of using calculated columns in a Power BI data model?To directly update the source databaseTo improve data import speedTo perform row-level calculations in the data modelTo replace measures in the data model120s
- Q3Which of the following relationships should be avoided to optimize the performance of a Power BI data model?One-to-Many relationshipsMany-to-Many relationshipsOne-to-One relationshipsHierarchical relationships120s
- Q4When dealing with time intelligence in Power BI, which feature should you use to handle complex time-based calculations?Custom visualsSQL-based calculationsDAX time intelligence functionsPower Query transformations120s
- Q5What is the purpose of using the 'ALL' function in a DAX expression?To create a new calculated columnTo apply filters to the data contextTo remove filters from the data contextTo format the data120s
- Q6How can you ensure that a Power BI report is responsive when dealing with large datasets?Disable report interactionsIncrease the report page sizeImplement AggregationsUse multiple data sources120s
- Q7Which method can be used to improve query performance in Power BI by reducing the amount of data loaded?Data GatewayData FlowsQuery FoldingIncremental Load120s
- Q8What is the primary use of the 'RELATED' function in DAX?To join two tablesTo filter dataTo calculate a new measureTo fetch values from a related table120s
- Q9How can you reduce the size of a Power BI data model?Add more calculated columnsRemove unused columns and tablesUse more complex DAX functionsIncrease the number of visuals120s
- Q10Which of the following is a best practice when creating hierarchies in Power BI?Only use hierarchies for time-based dataAvoid using hierarchies to keep the model simpleCreate as many hierarchies as possibleInclude all levels of granularity needed for analysis120s
- Q11What is the effect of enabling 'Auto Date/Time' for new files in Power BI?It disables manual date/time calculationsIt creates hidden date tables for each date fieldIt automatically updates the data sourceIt formats the date fields in the report120s
- Q12Which DAX function is used to calculate a running total in Power BI?SUMMARIZESUMXTOTALYTDCALCULATE120s
- Q13How do you create a measure in Power BI that dynamically changes based on user selections?Adjust the data source queryUse Power Query to create dynamic tablesCreate a calculated columnUse DAX functions like SWITCH and SELECTEDVALUE120s
- Q14What is the primary advantage of using Power BI Dataflows?To improve visualization performanceTo create advanced custom visualsTo directly edit the data modelTo enable data reuse and consistency across multiple reports120s
- Q15What should be done to ensure that the Power BI model relationships are correctly defined?Avoid creating relationshipsRely on Power BI service settingsUse only automated relationship detectionRegularly review and validate relationships120s