The three-tiered ANSI-SPARC (Standardized Architecture for Relational Databases) architecture is a model that defines the components and relationships of a database management system (DBMS). The ANSI-SPARC architecture is based on the concept of separating the logical and physical aspects of the database into three levels: the external level, the conceptual level, and the internal level.

There are several advantages to using the three-tiered ANSI-SPARC architecture for a DBMS, including the following:

• Separation of concerns: The three-tiered ANSI-SPARC architecture provides a separation of concerns between the end user, the database administrator, and the physical storage of the data. The external and conceptual levels provide a logical view of the data that is independent of the physical implementation, which allows the DBMS to support multiple views of the data and to hide the details of the physical storage from the user. The internal level provides the physical implementation of the data, and it is responsible for storing and accessing the data on the computer.
• Modularity: The three-tiered ANSI-SPARC architecture promotes modularity by separating the logical and physical aspects of the database into different levels. This allows different components of the DBMS to be developed and maintained independently, which makes it easier to modify and extend the system.
• Flexibility: The three-tiered ANSI-SPARC architecture provides flexibility by allowing the logical and physical aspects of the database to be separated and modified independently. This allows the DBMS to support multiple views of the data, and to adapt to changing requirements and environments.
• Interoperability: The three-tiered ANSI-SPARC architecture promotes interoperability by providing a standard model for designing and implementing relational databases. This allows different DBMSs to interoperate with each other, and to exchange data in a standardized way.
• Performance: The three-tiered ANSI-SPARC architecture can improve the performance of the DBMS by allowing the query processor to optimize the execution of queries based on the logical and physical structure of the data. The three-tiered architecture also allows the DBMS to scale the data storage and processing capacity as the data grows, without sacrificing performance or reliability.

Overall, the three-tiered ANSI-SPARC architecture provides several advantages for a DBMS, including separation of concerns, modularity, flexibility, interoperability, and performance. These advantages make the three-tiered ANSI-SPARC architecture a widely used and effective model for designing and implementing relational databases.