ETL testing is quite different from Database testing and other conventional testing because it requires a data centric testing approach.One would face many challenges during the ETL testing and some of the challenges are as below:
1. ETL Testing involves testing of large volume of data. So, sometimes it is difficult for a tester to determine how much data needs to be verified.
2. The data in ETL testing is quite complex.
3. There can be loss of data during the ETL testing.
4. Involvement of incompatible and duplicate data.
5. Business flow information may not be complete and there can be some missing data.
6. ETL testing involves complex SQL queries for comparing the data.
7. ETL testers are normally not allowed to run the jobs and there is dependency on the developers.
The data is crucial for making the important business conclusions and the software testing companies plays a major role in validating this data and ensuring that there is no data loss.
