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Communication boundary of a DBMS
A DBMS interface is the abstraction of a piece of functionality of a DBMS. It usually refers to the communication boundary between the DBMS and clients or to the abstraction provided by a component within a DBMS. A DBMS interface hides the implementation of the functionality of the component it encapsulates.
DBMS interfaces can be external or internal . The external DBMS interface is the communication boundary between the DBMS and clients. The external DBMS interface enables clients to access internal DBMS functionality without exposing the mechanisms of how this functionality is implemented. Well-known external DBMS interfaces are SQL, XPath, and XQuery. There are many different types of external DBMS interfaces, for example, stand-alone languages (such as SQL), extensions to existing languages with features from SQL (such as JDBC), and integration into middle-tier programming languages (such as PHP). The external...