Oracle??™s former ???Web-to-Go??? product
is also part of the Mobile Server and provides centralized wizard-based application
development and deployment.
33
Chapter 2 CHAPTER 2
Oracle Architecture2
This chapter focuses on the concepts and structures at the core of the Oracle database.
When you understand the architecture of the Oracle server, you??™ll have a
context for understanding the rest of the features of Oracle described in this book.
An Oracle database consists of both physical and logical components. The first section
of this chapter covers the difference between an Oracle database and an
instance, and subsequent sections describe physical components, the instance, and
the data dictionary.
Databases and Instances
Many Oracle practitioners use the terms instance and database interchangeably. In
fact, an instance and a database are different (but related) entities. This distinction is
important because it provides insight into Oracle??™s architecture.
In Oracle, the term database refers to the physical storage of information, and the
term instance refers to the software executing on the server that provides access to
the information in the database.
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