Database testing usually consists of a layered process, including the user interface (UI) layer, the business layer,
the data access layer and the database itself. The UI layer deals with the interface design of the
database while the business layer includes databases supporting business strategies. One of the most
critical layers is the data access layer, which deals with databases directly during the communication
process. Database testing mainly takes place at this layer and involves testing strategies such as quality
control and quality assurance of the product databases. Testing at these different layers is frequently
used to maintain consistency of database systems