What are the most common challenges faced by Informatica ETL testers when validating complex data transformations?

Informatica ETL Testers often encounter challenges related to handling large volumes of data, ensuring data integrity during complex transformations, and identifying discrepancies between source and target systems. Testing requires a deep understanding of business logic, data mapping, and Informatica workflows to create effective test cases and validate results efficiently. Close collaboration with ETL developers, business analysts, and database administrators is essential to clarify requirements and quickly resolve data-related issues during the testing cycle.