ETL VS DATABASE TESTING

Differences between the ETL and the Database Testing

ETL and database testing involve data validation, but both are not same. ETL testing is usually performed on data in a data warehouse, whereas database testing performed on transactional systems. Data comes from different applications into the transactional database.

Operations performed in ETL Testing

ETL testing involves the following operations:

• Validation of data movement from source to the target system.
• Data count verification in the source and target system.
• ETL testing verifies the transformation, extraction as per requirement and expectation.
• ETL testing ensures that data loads within an expected time frame to improve the scalability and performance.

The operation performed in Database Testing

Database testing focuses on data accuracy, the correctness of data, and valid values.

Database testing performs the following operations:

• Database testing focuses on verifying the column in a table has valid data values.
• To verify whether the primary or foreign key is maintained, database testing used.
• Database testing verifies whether the data is missing in the column. Here, we will check there are any null values exist in a column which should have a valid value.
• We are verifying the accuracy of data in columns.

For example, column of number of months shouldn't have a value greater than 12.