What aggregation feature is missing from the EER model? How can the EER model be further enhanced to support it? 4.14. What are the main similarities and differences between conceptual database modeling techniques and knowledge representation techniques? 4.15. Discuss the similarities and differences between an ontology and a database schema.

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Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.