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Object documentation Instances 

Definition

SAP instances are defined during the installation of the SAP system.

Note

The term “instance” is often used synonymously with “server” or “application server” in the SAP system. This depends on the selected installation environment. You can install multiple instances on one application server.

An SAP instance defines a group of resources such as memory, work processes and so on, usually in support of a single application server or database server within a client/server environment. Application servers share the same memory areas and are controlled by the same dispatcher process.

An SAP instance is handled by CCMS as a unit. A user logs on to the SAP system using an instance.

An SAP system can consist of one or more instances, such as an SAP system with a single instance with only one central server or a client/server system with two or more separate instances.

For each SAP instance:

·  Separate directories are defined on the UNIX, AS/400, or Microsoft Windows NT server on which the instance is to run

·  Shared file systems can be used

·  Entries are created in operating system configuration files (/etc/services, /etc/sapconfig...)

·  Communication entries are created in the host

·  Start and system profiles are created

·  Operating system users are installed

Note

An SAP instance is not assigned automatically to an operation mode.

See also:

Creating an Instance Definition for All Servers

Prerequisites for Starting Remote Instances

Creating the Instance Definition for a Server

Consistency Check

Starting and Stopping Instances

Monitoring Servers and Work Processes