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Database Systems: Concepts, Design and Applications, 2nd Edition by Shio Kumar Singh

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CHAPTER11

Query Processing and Optimization

11.1 INTRODUCTION

In Chapter 5, we described various types of relational query languages to specify queries for the data manipulation in a database. Therefore, query processing and its optimization become important and necessary functions for any database management system (DBMS). The query for a database application can be simple, complex or demanding. Thus, the efficiency of query processing algorithms is crucial to the performance of a DBMS.

In this chapter, we discuss the techniques used by a DBMS to process, optimise and execute high-level queries. This chapter describes some of the basic principles of query processing, with particular emphasis on the ideas underlying query optimization. It discusses ...

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