Free ETL Testing Trivia Questions and Answers

Question 1

Which of the following organizes or generates transformation sets?

Accepted Answer

Mapplet

Answer

In Informatica PowerCenter, a 'Mapplet' is a reusable object that contains a set of transformations. It allows developers to organize and reuse common transformation logic across multiple mappings, promoting consistency and efficiency. Mapplets encapsulate a group of transformations, which can then be used as a single object within a mapping.

Question 2

Converting data from one form to another is a part of the ___ process.

Accepted Answer

Transforming

Answer

'Transforming' is the 'T' in ETL and refers to the process of converting data from its raw source format into a format suitable for the target system and business requirements. This involves applying business rules, cleaning data, aggregating, filtering, and performing calculations. It's a crucial step to ensure data quality and usability in the destination.

Question 3

Errors can be corrected in _______ based on the Metadata of a set of specified rules.

Accepted Answer

Cleansing

Answer

'Cleansing' is the process of detecting and correcting (or removing) corrupt or inaccurate records from a record set, table, or database. In ETL, errors identified during data profiling or analysis can be corrected during the cleansing phase based on predefined rules and metadata. This ensures data quality before loading into the target system.

Question 4

In the database, facts and aggregate facts are put into hierarchical groups called _____.

Accepted Answer

Dimensions

Answer

In a data warehouse, 'Dimensions' are hierarchical groups that categorize and describe the data stored in fact tables. They provide context to the facts (measures) by defining attributes like time, product, customer, or location. Dimensions allow users to analyze facts from different perspectives and drill down into data details.

Question 5

What tasks does a business analyst perform?

Accepted Answer

Requirements are gathered and documented by the business analyst.

Answer

Business analysts play a pivotal role in the initial stages of any project, including ETL. Their primary responsibility is to engage with stakeholders to understand and gather the specific business needs and requirements. They then translate these into detailed documentation that guides the development and testing teams, ensuring the final solution aligns with organizational objectives.

ETL Testing - extract, transform, load Practice Test

ETL Testing - extract, transform, load Practice Test

Free ETL Testing Trivia Questions and Answers