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Introduction to Database Systems Module 1, Lecture 1

Database management Systems , R. Ramakrishnan1 Introduction to Database SystemsModule 1, Lecture 1 Instructor: Raghu management Systems , R. Ramakrishnan2 What Is a DBMS?vA very large, integrated collection of real-world enterprise. Entities ( , students, courses) Relationships ( , Madonna is taking CS564)vA Database management system (DBMS) is asoftware package designed to store andmanage management Systems , R. Ramakrishnan3 Why Use a DBMS?vData independence and efficient application development integrity and data access, recovery from management Systems , R. Ramakrishnan4 Why Study Databases??vShift from computation to information at the low end : scramble to webspace (a mess!)

Database Management Systems, R. Ramakrishnan 15 Structure of a DBMS A typical DBMS has a layered architecture. The figure does not show the concurrency control and recovery components. This is one of several possible architectures; each system has its own variations. Query Optimization and Execution Relational Operators Files and Access Methods

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