ETL Testing

ETL is short for extract, transform, load, three database functions that are combined into one tool to pull data out of one database and place it into another database.

Q.1 What does ETL stand for?

ETL expands to Extract, Transform and Load which are stage s or phases of moving data from one data source or database to another.

Q.2 What is ETL Testing?

ETL testing – ETL expands to Extract, Transform and Load hence, ETL testing involves testing the ETL procedure in all stages of ETL i.e. pre-ETL or extract stage, during Transform stage and final or load stage.

ETL testing generates test cases for checking data correctness, reliability and completeness during the ETL process.

Q.3 Is ETL Testing difficult?

ETL Testing is not difficult but complex as deeper understanding of ETL process and its phases is needed along with data representation and conversion.

ETL Testing has many challenges and the crucial being testing the data for correctness, validity, reliability and completeness, considering the variety in data representation and schema.

Q.4 Which tool is used for ETL Testing?

Many tools are used for ETL Testing. Selecting ETL tool depends upon various factors like your requirements, budget, time for testing, what to test, etc

Q.5 Is ETL testing manual testing?

ETL  testing is not manual testing as manual testing is testing of software tools and applications, manually. Test design, execution and analysis, all stages of software testing are manually. It can include software testing, out of preview of ETL Testing.

ETL Testing is implemented in all phases of ETL process i.e. Extract, Transform and Load for data correctness, validity, reliability and completeness.

ETL testing can be done manually or by using scripts for automation.

Q.6 What are the skills required for ETL Testing?

The skills required for ETL Testing are

-          Technical skills in using ETL Testing tools

-          Good database design concepts and technique knowledge

-          Conversant with SQL, SQL queries and procedures

-          Knowledge of ETL and data warehousing

-          Data quality testing experience

-          Logical for preparing scripts for automation

-          Team player to collaborate with other team members and other departments

Q.7 Does ETL Testing have scope?

Yes, ETL Testing has scope of the complete ETL process. ETL testing involves testing the ETL procedure in all stages of ETL i.e. pre-ETL or extract stage, during Transform stage and final or load stage.

ETL Testing helps testing professionals get more career related benefits. You can register for ETL Testing at link - https://www.vskills.in/certification/testing/etl-testing-certification

Q.8 How is ETL Testing done?

ETL testing is done similar to other software testing. ETL testing involves, setting test goals, making test plans and test suites and then executing test plans and analyzing the results.

ETL testing is executed at all stages of ETL - extract stage, Transform stage and load stage for data completeness, validity, reliability and correctness.

Q.9 Can we automate ETL Testing?

We can automate ETL Testing by using scripts and automation tools. Various automation tools are available as commercial and open source software.

Q.10 Can selenium be used for ETL Testing?

Selenium can be used for ETL Testing is there is a need for same. But, usually Selenium is used for automation testing of web applications.

Q.11 What is data validation in ETL Testing?

Data validation in ETL Testing refers to validating data for its data quality against prescribed level of quality being desired.

Data validation in ETL Testing ensures correctness and reliable data being transferred to new data source or database.

Q.12 What is ETL SQL?

ETL SQL  refers to usage of SQL in ETL. ETL expands to Extract, Transform and Load. ETL SQL  usage is as per database and data warehouse used for ETL implementation.

Q.13 What is data ETL?

Data ETL refers to data in the ETL process. ETL is process of moving data from one database to other whilst, transforming it as well.

Q.14 What is ETL QA?

ETL QA refers to applying QA or quality assurance for ETL process, to ensure conformance to quality levels, during ETL. QA conducts data validation and verification, to maintain data integrity and reliability.

ETL QA maintains quality across all phases of ETL - Extract, Transform and Load

Q.15 What are ETL Tester responsibilities?

ETL Tester responsibilities includes

-          Developing test cases as per requirement

-          Executing test cases

-          Analyzing test case execution results

-          Documenting all test cases and results for future

Q.16 What are ETL skills?

ETL skills include

-          Technical skills in using ETL tools

-          Learning skills for grasping new tools

-          Good database design concepts and technique knowledge

-          Conversant with SQL, SQL queries and procedures

-          Knowledge of ETL and data warehousing

-          Data quality testing experience

-          Logical mindset for automation script preparation

Q.17 Why ETL Testing is required?

ETL Testing is required for checking data correctness, reliability and completeness during the ETL process. ETL Testing assures that data has been loaded to destination database while maintaining correctness and reliability of the data.

Q.18 What is ETL architecture?

ETL architecture refers to the architecture or layout of all components in the ETL process, their role, interfaces, data exchange and quality to be maintained.

Q.19 What are the challenges faced in ETL Testing?

The challenges faced in ETL Testing are

-          Poor business information availability

-          Risk of data loss during ETL process

-          Vague requirements

-          Indifferent data representations

-          Multitude of data transformations

-          Metadata inconsistencies

Q.20 What is test data in manual testing?

Test data in manual testing refers to sample data used in execution of test cases. Test data should be carefully selected as per the goals of testing so as to better discover errors in the system. Test data in manual testing verifies and validates the software under test as per output generated by execution of test cases with test data.

Q.21 What is ELT testing?

ETL testing – ETL expands to Extract, Transform and Load hence, ETL testing involves testing the ETL procedure in all stages of ETL i.e. pre-ETL or extract stage, during Transform stage and final or load stage.

Q.22 Is there any certification for automation testing?

There is certification for automation testing and other software testing as well at link - https://www.vskills.in/certification/testing

Q.23 Which certification is best for testing?

Certification best for testing are dependent upon your skills, testing type you want to certify upon and time you can provide for preparing and appearing for certification.

You should select testing certification by answering following questions

-          Does Hard copy or e-learning is provided?

-          Practice test for assessing oneself is given?

-          Are video demonstrations provided?

-          What is the alumni strength

Vskills provides the all the above for software testing at link - https://www.vskills.in/certification/testing

Q.24 Is there any certification for ETL testing?

Yes, ETL testing certification is at link - https://www.vskills.in/certification/testing/etl-testing-certification

 

Vskills offers following deliverables

-          Online video based, e-learning LMS

-          Hard copy to candidates residing in India

-          Practice tests for assessing your knowledge

-          Government certification

-          Alumni is in software testing companies like Accenture, Cognizant, IBM, TCS, etc

Q.25 Is there any good link to practice my ETL testing skills?

Yes, link to practice ETL testing skills is at link - https://www.vskills.in/practice/etl-testing-questions

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