It ensures that the ETL process functions well with other upstream and downstream processes. A Data warehouse implementation is a collection of many components, and hence integration testing is a must. Typically, system testing only includes testing within the ETL application.
It is same as ETL testing.
Key responsibilities of an ETL tester are segregated into three categories
Stage table/ SFS or MFS Business transformation logic applied Target table loading from stage file or table after applying a transformation.
Some of the responsibilities of an ETL tester are:
Test ETL software Test components of ETL datawarehouse Execute backend data-driven test Create, design and execute test cases, test plans and test harness Identify the problem and provide solutions for potential issues Approve requirements and design specifications Data transfers and Test flat file Writing SQL queries3 for various scenarios like count test