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Oracle® Database 2 Day DBA 11g Release 2 ( 11.2 ). Oracle Database 2 Day DBA is a database administration quick start guide that teaches you how to perform day-to-day database administrative tasks. The goal of this book is to help you understand the concepts behind Oracle Database. It teaches you how to perform all common administration tasks needed to keep the database operational, including how to perform basic troubleshooting and performance monitoring activities. Only minimal basic knowledge of or experience with database management is required, and a basic knowledge of computers. In particular, this guide is for the following groups of Oracle users: Developers who want to acquire basic database administrator ( DBA ) skills; Anyone managing database servers; Database administrators managing an Oracle database for a small or medium-sized business. Oracle Database is a relational database with object and Extensible Markup Language ( XML ) capabilities. In a relational database, all data is stored in two-dimensional tables that are composed of rows and columns. Oracle Database enables you to store data, update it, and efficiently retrieve it, with a high degree of performance, reliability, and scalability. Oracle Database is composed of the following elements: The Oracle software that you install on your host computer; The database, which is a collection of physical files on one or more disks ( the database contains user data, metadata, and control structures. Metadata, or data about the data, is the collection of information on disk that permits Oracle software to manage user data. Control structures ensure the integrity, availability, and recoverability of user data ); The Oracle instance, composed of the background processes ( the operating system processes or threads that perform the work of accessing, storing, monitoring, and recovering user data, metadata, and control files associated with the database ) and the shared memory areas used by the background processes; Server processes that perform work on behalf of connected users and applications, and the memory and temporary storage used by these processes ( server processes parse and execute SQL statements, and retrieve and return results to the user or application ); Oracle Net, which is a software layer that enables client applications and Oracle Database to communicate over a network, and the Oracle Net listener, which is a process that listens for connection requests from the network.
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