DXC Technology Backup Administrator Interview Questions and Answers

Q1. Wat is cardinality
Ans. 
Cardinality refers to the uniqueness of values in a column or relationship.
• Cardinality is the number of unique values in a column or relationship.

• High cardinality means a column has many unique values, while low cardinality means few unique values.

• For example, a column like 'Customer ID' may have high cardinality, while 'Gender' may have low cardinality.
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Q2. Challenges faced
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Q1. Write SQL query
Ans. 
SQL query to retrieve data from a table
• Use SELECT statement to specify columns to retrieve

• Use FROM statement to specify the table to retrieve data from

• Use WHERE statement to filter the data based on conditions
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Power bi desktop in power bi service

Q1. What is power bi
Ans. 
Power BI is a business analytics tool by Microsoft that provides interactive visualizations and business intelligence capabilities.
• Power BI allows users to connect to various data sources and create interactive reports and dashboards.

• Users can easily share and collaborate on reports with others within the organization.

• It offers features like data modeling, data visualization, and data transformation.

• Power BI can be use...read more
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Q2. How creative a dashboard in power query
Ans. 
A creative dashboard in Power Query involves using unique visuals and interactive elements to present data in an engaging way.
• Utilize custom visuals to display data in a visually appealing manner

• Incorporate interactive elements such as slicers and filters for user-friendly navigation

• Use color coding and formatting to highlight important insights

• Include dynamic elements like tooltips and drill-down capabilities

• Experimen...read more
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Q1. Power bi desktop
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Q2. Write the Dax query in data modeling
Ans. 
Write a DAX query in data modeling
• Use CALCULATE function to apply filters and context to calculations

• Use SUMX function to iterate over a table and perform calculations

• Use RELATED function to retrieve related values from other tables
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Q1. What is power pivot
Ans. 
Power Pivot is a data modeling tool in Excel that allows users to create relationships, calculations, and measures for analyzing large datasets.
• Power Pivot is an add-in for Excel that enables users to create data models and perform advanced data analysis.

• It allows users to import and combine data from multiple sources, create relationships between tables, and define calculations and measures.

• Users can create complex ca...read more
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Q2. Creation in dax
Ans. 
Creation in DAX refers to the process of generating new calculated columns or measures in Power BI using Data Analysis Expressions.
• Use DAX functions like CALCULATE, SUMX, AVERAGE, etc. to create new columns or measures

• Understand the data model and relationships to create accurate calculations

• Test the newly created calculations to ensure they are working correctly
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Q1. What are duplicates and references
Ans. 
Duplicates are identical copies of data, while references are pointers to the same data in memory.
• Duplicates are exact copies of the original data.

• References point to the same data in memory.

• Duplicates can lead to inconsistencies in data analysis.

• References are more memory efficient than duplicates.
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Q2. How do you implement incremental refresh
Ans. 
Incremental refresh in Power BI allows for loading only new or modified data to improve performance.
• Set up incremental refresh policy in Power BI Service

• Define a range of values for the refresh policy

• Use parameters to filter data based on the refresh policy

• Schedule regular refreshes to update the dataset
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Q1. What are the components of Power bi
Ans. 
Power BI components include Power Query, Power Pivot, Power View, Power Map, and Power Q&A.
• Power Query: Used for data extraction and transformation.

• Power Pivot: Used for data modeling and analysis.

• Power View: Used for interactive data visualization.

• Power Map: Used for geographical data visualization.

• Power Q&A: Allows users to ask questions in natural language and get answers from data.
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Q2. What is mean by DAX
Ans. 
DAX stands for Data Analysis Expressions and is a formula language used in Power BI for creating custom calculations.
• DAX is used to create custom calculations in Power BI, similar to Excel formulas.

• It can be used to create calculated columns, measures, and calculated tables.

• DAX functions can be used to manipulate data, perform calculations, and create complex expressions.

• Examples of DAX functions include SUM, AVERAGE,
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Q3. What is mean by M language
Ans. 
M language is a powerful data transformation language used in Power Query in Power BI.
• M language is used to transform and clean data in Power BI.

• It is a functional language with a wide range of functions and operators.

• M language is case-sensitive and uses a step-by-step approach to data transformation.

• Examples of M language functions include Table.TransformColumns and List.Transform.
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It was a real-time scenario that they asked about.

Scenario based with power BI UI creation

Q1. Structure way of Power BI
Ans. 
Power BI is a business intelligence tool used for data visualization and analysis.
• Power BI allows users to connect to various data sources such as databases, Excel files, and online services.

• Users can create interactive reports and dashboards using Power BI's drag-and-drop interface.

• Power BI offers a wide range of visualization options like charts, graphs, and maps to present data effectively.

• Users can share their repo...read more
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Q2. Reports of Power BI
Ans. 
Power BI reports are visual representations of data insights, created using Power BI Desktop or Power BI Service.
• Power BI reports are interactive and customizable

• They can include various visualizations like charts, graphs, tables, and maps

• Reports can be shared and accessed online through Power BI Service

• Data can be refreshed in real-time or scheduled updates
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Q1. Scenario based question on Power BI summarized table view concept
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Q2. How to achieve dynamic chart based on selection button
Ans. 
Use Power BI bookmarks and buttons to dynamically change chart visuals based on user selection.
• Create multiple chart visuals for different data sets

• Use bookmarks to save different chart configurations

• Link selection buttons to bookmarks to dynamically switch between charts
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