Introduction

Informatica is highly valued in data integration and ETL (Extract, Transform, Load). Whether you are a beginner in the field of data engineering or a professional trying to advance your ETL career, it is important to understand the necessary concepts and gain practical experience before preparing for an Informatica interview. These informatica Interview questions will help you to build your knowledge in the field of ETL, and help you to get prepared for the Interview.

This blog covers common Informatica interview questions by experience level, with answers to Which will help you to get prepared for the interview.

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Beginner-Level Informatica Interview Questions

1. What is Informatica?

Answer: Informatica is an ETL tool that helps users connect to various data sources, transform the data as needed, and load it into a target system like a database or data warehouse.

2. What are the main components of Informatica PowerCenter?

Answer: The list of Components are as follows:

• Repository Service
• Integration Service
• Repository Manager
• Designer
• Workflow Manager
• Workflow Monitor

3. What is a mapping in Informatica?

Answer: A mapping is defined as it consists of source and target system and transformation rules which explain how the data moves from the source to the target system in the informatica.

4. What are various types of transformations in Informatica?

Answer: The different types of Transformations which are commonly used are as follows:

• Aggregator
• Filter
• Expression
• Joiner
• Lookup
• Sorter
• Router
• Update Strategy

5. What is the difference between connected and unconnected Lookup?

Answer: The difference between connected and unconnected Lookup is like :

• Connected Lookup is defined as it receives input directly from the pipeline as part of the data flow.
• Unconnected Lookup: Called manually with a function and returns a single value each time.

Intermediate-Level Informatica Interview Questions

6. What is a Workflow?

Answer: A workflow is defined as a set of instructions for the Informatica Server to perform tasks such as sessions, decision tasks, and email notifications.

7. Explain the difference between static and dynamic cache in Lookup transformation.

Answer:

• Static Cache: The data remains constant throughout the execution of the session.
• Dynamic Cache enables cache updates while a session is running.

8. How do you handle performance issues in Informatica?

Answer:

The best practices which handles the performance include:

• Using bulk transfer
• Reducing lookups
• Indexing tables
• Avoid extra changes
• Use partitions

9. What is the role of update strategy transformation?

Answer: It controls insert, update, delete, and reject operations based on specific conditions.

10. What are mapplets and how are they useful?

Answer: A mapplet is a reusable object that includes various transformations, allowing for modular and reusable logic across different mappings.

 Advanced-Level Informatica Interview Questions

11. What are the types of partitioning available in Informatica?

 Answer:

• Round-Robin
• Hash
• Key Range
• Pass-through
• Database Partitioning

12. Explain pushdown optimization.

Answer: Pushdown optimization enables transformation logic to run in the database instead of the Informatica engine, enhancing performance.

13. What is a session and how do you configure it?

Answer: A session is a task in Workflow Manager that executes a mapping. It includes settings for connection details, pre/post SQL, and performance tuning options.

14. What are indirect source files?

Answer: Indirect source files consist of a file that lists multiple flat files to be used as data sources, rather than just one flat file.

15. How do you implement error handling in Informatica?

Answer:

• Use error logs and reject files
• Use error handling flags in Update Strategy
• Use Exception Handling framework in workflows
• Apply row-level error tracking

Conclusion

• Referring to these Informatica Interview Questions, you can understand basic data warehouse concepts such as star schema and data types.
• You can practice creating mappings and workflows in Informatica PowerCenter.
• While going through these questions, you will get ready for scenario-based questions that may help you to create a map in real-time.
• You can also understand your project experience well, focusing on your role and contributions.

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