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This chapter describes some of the basic concepts of Oracle Parallel Servers and parallel server instances. You can control the activity of parallel servers and parallel server instances from Oracle Enterprise Manager's Navigator window. This chapter also describes the tasks you need to perform before you can start or shut down a parallel server.
Specifying User Preferences for Parallel Server Nodes
An Oracle Parallel Server Instance is comprised of background processes and shared memory (SGA) and allows you to access a database. You can connect to any instance to access any information that resides within a parallel server database.
You can access two types of activities within a parallel server: database-related activities and instance-related activities.
A database-related activity is any action or data stored in the database itself using tables. When you execute a parallel server job which involves a database-related activity, the job only needs to execute once. An example of a job containing database-related activity is the executing of SQL statements.
An instance-related activity is any action or data that pertains to a single instance. The data portion resides in the instance's SGA. When you execute a parallel server job which involves an instance-related activity, the job needs to be executed on every instance of the parallel server. An example of a job containing instance-related activity is starting or stopping an instance.
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