Last, but certainly not least, we will show how Oracle 11g Real
Application Clusters (RAC) can at the same time provide extreme scalability and transparent
failover capabilities to a database environment. Even if you don??™t use Oracle 11g??™s RAC features,
the standby features make Oracle 11g almost as available as a clustered solution; being able to
easily switch between standby and primary databases as well as query a physical standby database
provides a robust high-availability solution until you are ready to implement a RAC database.
In Part IV of this book, we will cover a variety of issues revolving around Networked Oracle.
Not only will we cover how Oracle Net can be configured in an N-tier environment, but also
how we manage large and distributed databases that may reside in neighboring cities or around
the world.
In this chapter, we cover the basics of Oracle Database 11g, highlighting many of the features
we will cover in the rest of the book as well as the basics of installing Oracle 11g using Oracle
Universal Installer (OUI) and the Database Configuration Assistant (DBCA). We will take a tour
of the elements that compose an instance of Oracle 11g, ranging from memory structures to disk
structures, initialization parameters, tables, indexes, and PL/SQL. Each of these elements plays a
large role in making Oracle 11g a highly scalable, available, and secure environment.
An Overview of Databases and Instances
Although the terms ???database??? and ???instance??? are often used interchangeably, they are quite
different.
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