Database Testing companies engages in scrutinizes the optimization of database design. It helps the interaction between the middleware and the backend, and the validation if all the mandatory and optional field validations are working fine. Moreover, if the Database has not been designed efficiently, it will lead to Data Redundancy & Data Duplicity, which is a far bigger issue for enterprise apps.
Most of the database testing companies list out critical features of the application and try to functionally test them by sending the data and logging in the Database to check if all the values are received as sent. Database Testing requires to check the schema, writing queries, tables, triggers, and procedures in a web or desktop application imbibed by standard rules.