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Conceptual Design Using the Entity-Relationship (ER) Model

Database Management Systems, R. Ramakrishnan1 Conceptual Design Using theEntity- relationship (ER) ModelModule 5, Lectures 1 and 2 Database Management Systems, R. Ramakrishnan2 Overview of Database DesignvConceptual Design : (ER Model is used at this stage.) What are the entities and relationships in the enterprise? What information about these entities and relationshipsshould we store in the database? What are the integrity constraints or business rules that hold? A database ` schema in the ER Model can be representedpictorially (ER diagrams). Can map an ER diagram into a relational Refinement: (Normalization) Check relationalschema for redundancies and related Database Design and Tuning: Consider typicalworkloads and further refine the database Management Systems, R. Ramakrishnan3ER Model BasicsvEntity: Real-world objectdistinguishable fromother objects. An entity is described (in DB) Using a set of Set: A collection of similarentities.

– A database `schema’ in the ER Model can be represented pictorially (ER diagrams). – Can map an ER diagram into a relational schema. Schema Refinement: (Normalization) Check relational schema for redundancies and related anomalies. Physical Database Design and Tuning: Consider typical workloads and further refine the database design.

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