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Welcome to the ETL Testing Quiz! This blog post features 25 multiple-choice questions that explore basic concepts of ETL Testing.
1. What is the full form of ETL?
a) Extract, Transformation and Load
b) Extract, Transformation and Lead
c) Extract, Transfusion and Load
d) Extract, Transfusion and Lead
Answer 1
a) Extract, Transformation and Load
2. To fetch data from one database and place it in another, ETL combines all ____ database functions into one tool.
a) One
b) Two
c) Three
d) Four
Answer 2
c) Three
To fetch data from one database and place it in another, ETL combines all three database functions into one tool.
3. What is the main purpose of ETL Testing?
Choose one option
a) To test application UI
b) To ensure data is extracted, transformed, and loaded correctly
c) To verify API endpoints
d) To check database installation
Answer 3
b) To ensure data is extracted, transformed, and loaded correctly
4. Which of the following is NOT an ETL tool?
Choose one option
a) Informatica
b) Talend
c) QlikView
d) DataStage
Answer 4
c) QlikView
QlikView is a reporting/visualization tool, not an ETL tool.
5. Data in ETL testing is usually extracted from
a) Flat files
b) Databases
c) APIs
d) All of the above
Answer 5
d) All of the above
6. In ETL testing, surrogate keys are
Choose one option
a) Natural business keys
b) System-generated unique identifiers
c) Duplicate keys
d) Encrypted passwords
Answer 6
b) System-generated unique identifiers
7. Getting information from a database is called ___
Choose one option
a) Extracting
b) Transforming
c) Loading
d) None
Answer 7
a) Extracting
8. The process of ____ data involves converting it from one form to another.
Choose one option
a) Extracting
b) Transforming
c) Loading
d) None
Answer 8
b) Transforming
9. Writing data into a database is called ___
a) Extracting
b) Transforming
c) Loading
d) None
Answer 9
c) Loading
10. ETL is often used to build a –
a) Data Center
b) Data Warehouse
c) Data Care Center
d) Data Set
Answer 10
b) Data Warehouse
11. In today’s environment, ETL is becoming more and more necessary for many reasons, including:
Choose one option
a) In order to make critical business decisions, companies use ETL to analyze their business data.
b) Data warehouses are repositories where data is shared.
c) In ETL, data is moved from a variety of sources into a data warehouse.
d) All of the above
Answer 11
d) All of the above
12. What is the main challenge in ETL Testing?
Choose one option
a) Verifying UI elements
b) Handling large volumes of data
c) Testing mobile devices
d) Validating screen layouts
Answer 12
b) Handling large volumes of data
13. Which is a popular open-source ETL tool?
Choose one option
a) Informatica
b) Talend
c) DataStage
d) Ab Initio
Answer 13
b) Talend
14. In ETL testing, reconciliation reports are used for
Choose one option
a) Matching UI data
b) Comparing source and target data counts
c) API validation
d) Security audit
Answer 14
b) Comparing source and target data counts
15. What is Incremental Load in ETL?
Choose one option
a) Loading full data every time
b) Loading only new/changed records
c) Reloading only primary keys
d) Reloading metadata only
Answer 15
b) Loading only new/changed records
16. What does CDC stand for in ETL?
Choose one option
a) Change Data Capture
b) Central Data Collection
c) Clean Data Conversion
d) Core Data Copy
Answer 16
a) Change Data Capture
17. Which SQL command is used to modify existing data in a table?
Choose one option
a) Alter
b) Update
c) Modify
d) Change
Answer 17
b) Update
The UPDATE statement is used to modify existing data in a table based on specified conditions.
18. You are testing an ETL process that extracts customer data from a source system and loads it into a data warehouse. During testing, you notice that some customer records have not been properly transformed, resulting in missing information. What could be the potential causes of this issue?
a) Inaccurate data mapping
b) Transformation logic errors
c) Data type mismatches
d) Insufficient data profiling
Answer 18
a) Inaccurate data mapping
19. While testing an ETL process, you encounter duplicate records in the target database. What strategies can you employ to identify and eliminate these duplicates?
a) Implement deduplication logic in the transformation phase
b) Utilize SQL queries with DISTINCT keyword
c) Perform data profiling to identify duplicate patterns
d) Leverage hashing algorithms for record comparison
Answer 19
a) Implement deduplication logic in the transformation phase and c) Perform data profiling to identify duplicate patterns
20. During ETL testing, you encounter data quality issues, such as missing values and inconsistencies. How can you ensure data quality is maintained throughout the ETL process?
Choose one option
a) Implement data validation checks at each stage
b) Use data profiling to identify anomalies
c) Perform data cleansing before transformation
d) Employ referential integrity constraints
Answer 20
a) Implement data validation checks at each stage
21. Which is NOT a challenge in ETL testing?
Choose one option
a) Large volume of data
b) Data quality issues
c) Testing across multiple systems
d) GUI responsiveness
Answer 21
d) GUI responsiveness
22. Which of the following checks record counts between source and target?
Choose one option
a) Data Completeness Testing
b) Data Transformation Testing
c) Regression Testing
d) Negative Testing
Answer 22
a) Data Completeness Testing
23. Data transformation in ETL testing may include
Choose one option
a) Aggregations
b) Data type conversions
c) Business rule application
d) All of the above
Answer 23
d) All of the above
24. A star schema consists of
a) Fact table and dimension tables
b) Only fact tables
c) Only dimension tables
d) Normalized tables
Answer 24
a) Fact table and dimension tables
25. In ETL testing, ‘mapping document’ is used to
a) Define schema design
b) Describe transformation rules
c) Maintain test cases
d) Automate test execution
Answer 25
b) Describe transformation rules
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