TAILIEUCHUNG - Oracle Database 2 Day DBA 11g Release- P4

Oracle Database 2 Day DBA 11g Release- P4: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 guide is to help you understand the concepts behind Oracle Database. It teaches you how to perform all common administrative tasks needed to keep the database operational, including how to perform basic troubleshooting and performance monitoring activities. | 5 Managing the Oracle Instance This chapter provides background information about the Oracle instance and instructions about how to manage the instance. This chapter contains the following sections Overview of the Oracle Instance and Instance Management Shutting Down and Starting Up the Oracle Instance Viewing and Modifying Initialization Parameters Managing Memory Instances Oracle By Example Series Overview of the Oracle Instance and Instance Management An Oracle database system consists of an Oracle database and an Oracle instance. Oracle database An Oracle database contains a set of operating system files that store data entered by users or applications and structural information about the database itself called metadata. Information is stored persistently in these files. Oracle instance An Oracle instance also known as a database instance contains the set of Oracle Database background processes that operate on the stored data and the shared allocated memory that those processes use to do their work. An instance must be started to read and write information to the database. Also it is the instance that actually creates the database upon receipt of instructions from the Oracle Database Configuration Assistant DBCA utility or upon receipt of a SQL statement from the database administrator. When the database instance is not available your data is safe in the database but it cannot be accessed by any user or application. The properties of a database instance are specified using instance initialization parameters. When the instance is started an initialization parameter file is read and the instance is configured accordingly. This section presents some of the concepts of an instance and its management. It contains the following topics About Initialization Parameters About Background Processes About Server and Client Processes About Instance Memory Structure Managing the Oracle Instance 5-1 Overview of the Oracle Instance and Instance Management About Instance Startup

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