Tag Archives: logical data

What is the difference between logical data independence and physical data independence-Which one is harder to achieve? Why?

Database System Concepts and Architecture 2.1 Define the following terms: data model, database schema, database state, internal schema, conceptual schema, external schema, data independence, DDL, DML, SDL, VDL, query language, host language, data sub language, database utility, catalog, client/server architecture, three-tier architecture, and n-tier architecture. 2.2. Discuss the main categories of data models. What are […]

What is the difference between the two-tier and three-tier client/server architectures?

Classification of Database Management Systems 2.1. Define the following terms: data model, database schema, database state, internal schema, conceptual schema, external schema, data independence, DDL, DML, SDL, VDL, query language, host language, data sublanguage, database utility, catalog, client/server architecture, three-tier architecture, and n-tier architecture. 2.2. Discuss the main categories of data models. What are the […]