August 2009
Intermediate to advanced
893 pages
26h 48m
English
Content preview from Database Systems: Concepts, Design and Applications
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
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 the techniques used to split complex ...