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This article is going to help you with the best ETL testing interview questions, and answers you just can't miss.
For the top businesses, ETL is taken as an important component in managing the business data and the information perfectly. ETL means Extract, Transform, and Load. All these three components are defined with different objectives and purposes.
ETL testing is a popular trend today with plenty of job opportunities and attractive salary options. Here, we have given a complete list of ETL testing interview questions and answers for freshers and experienced to help the job seekers in the best way. We have taken full care to give precise answers to each of the questions. Let us discuss ETL Testing Interview Questions and Answers one by one in the next sections.
ETL means Extract, Transform, and Load. All these three components are defined with different objectives and purposes.
ETL is the automated testing process where you don’t need any technical knowledge other than the software. Also, ETL testing is extremely fast, systematic, and assures top results as needed by businesses.
Manual testing is highly time-consuming where you need technical knowledge to write the test cases and the scripts. It is slow, needs effort, and is highly prone to errors.
ETL tools verify whether data is fetched correctly or not. It verifies whether data is converted or loaded correctly at a perfect time frame as needed by the business requirements to enhance the overall scalability and performance.
It verifies whether data is loaded into the targeted database correctly or not without any truncation or data loss. Also, it reports invalid data and replaces the same with default values.
Facts are the dimensions that are used to analyze data on different parameters. The three popular facts in ETL testing include-
Cubes – These are the data processing units that allow multi-dimensional analysis and each of the units is composed of fact tables and dimensions.
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OLAP Cubes –These cubes store voluminous data in the multi-dimensional format that consists of facts and is categorized as dimensions.
Source Bugs, Calculation Bugs, ECP-related bugs, load condition bugs, and User-Interface bugs.
Dimensions are named as groups or categories to sort the summarized data.
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The Staging place is the temporary storage area that is used during the Data Integration process. Here, Data is analyzed carefully for redundancy and duplication.
The ETL mapping sheet contains all necessary information from the source file and stores the details in rows and columns. This mapping sheet helps experts in writing SQL queries to speed up the testing process.
Tracing levels define the volume of data stored in the log files. They are divided into two major categories, these are Normal and Verbose. The normal category defines the tracing level in detail while the verbose category defines the tracing level at each row.
The level at which information of Fact is stored is named as Grain of Fact or Fact Granularity.
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Transformation is defined as the repository objects to generate, modify or pass the data. There may be Active Transformation and Passive Transformation. It may be beneficial in different ways:
The dynamic cache is used to update the master table or dimension table that changes slowly. In the case of flat files, the static cache is used.
The schema objects are the logical structure to define the database data including tables, views, clusters, indexes, database links or function packages, etc.
This blog has guided you with the ETL Testing questions and answers that will help you to crack your interview easily. So, if you want to enroll yourself for ETL testing or quality testing, then do visit us at janbasktraining.com
In summary, ETL tools have the potential to perform flawlessly with massive amounts of historical data and are required for ETL Testing. Experts usually employ the major ETL Testing operations due to the high demand for ETL testing. As a result, there are numerous career opportunities in the worldwide IT marketplace.
Only if you have a thorough understanding of technical aspects, ETL tools, and apps will you have a good chance of being hired swiftly. For this, you need to enroll in JanBask Training's software testing curriculum to have a better understanding of various testing techniques.
Do comment your thoughts and don’t forget to share your experiences. We wish you luck in your next interview!
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Paul Wilson
I am looking for some more etl testing questions, do you have more posts on the same topic.
JanbaskTraining
Thank you so much for your comment, we appreciate your time. Keep coming back for more such informative insights. Cheers :)
Emilio Davis
Post is good but I have listed very few questions.
JanbaskTraining
Glad you found this useful! For more such insights on your favourite topics, do check out JanBask Training Blogs and keep learning with us!
Zane Brown
Can i reach you experts for understanding some topics and questions that are important for etl testing interview.
Kaden Brown
What is the staging area exactly? Pls elaborate so that I can understand it better. Actually one of the interviewers asked me this, and I was not aware of it.
Amelia MILLER
Can you add some more detail in ETL testing interview questions ?
Gideon Coleman
I am so lucky that I picked JanBask Training as my guide. They helped me all the way from my basic concepts to the advanced level.
Adonis Smith
They sharpen up my skills and knowledge very well around this technology. Moreover, they also helped me build up my resume and prepared me for my interview.
JanbaskTraining
Thank you so much for your comment, we appreciate your time. Keep coming back for more such informative insights. Cheers :)
Dante Ramirez
I got myself trained by JanBask Training in SQL. I must say, they are fabulous! They helped me in every way possible.
JanbaskTraining
Glad you found this useful! For more such insights on your favourite topics, do check out JanBask Training Blogs and keep learning with us!
JanbaskTraining
Thank you so much for your comment, we appreciate your time. Keep coming back for more such informative insights. Cheers :)
Aidan Johnson
The content provided in this blog contains fantastic, informative, interesting, and to some extent new and helpful for me. Keep up the good work!
JanbaskTraining
Hello, JanBask Training offers online training to nurture your skills and make you ready for an amazing career run. Please write to us in detail at help@janbasktraining.com. Thanks!