In Chapter 1 we learned about the history of databases and database management systems (DBMS), where and when databases are useful (and just as important, not useful), and how databases are used on the Web. In this chapter we’re going to look at some of the theory underlying modern database systems. Much of this chapter will look at the most common data model used by database systems today: the relational model. We’ll introduce you to the core concepts of the relational model and how they interact, and show you examples of what relationally structured data look like. We’ll also introduce some other important concepts that are applicable to any database, relational or otherwise.
KeywordsRelational Model Database Management System Disk Access Data Dictionary Database Performance
Unable to display preview. Download preview PDF.