Database Reference
In-Depth Information
Central System Installation
If the SAP central instance and the database are installed on the same physical host, it is re-
ferred to as a central system installation. Usually, small SAP installations and nonproduction
systems are installed with this type.
Distributed System Installation
In a distributed system installation, the central instance and database are installed on two
different hosts. Usually, a distributed installation option is used for large SAP installations
and for production systems.
Dialog Instance
Additional application server instances installed for scalability and load balancing purposes
are referred to as dialog instances. Dialog instances have additional dialog, batch, spool, and
update work processes. These are joined to the central system.
SID
The SID is a system identifier for the SAP system. It consists of exactly three alphanumeric
uppercase characters; the first character must be a letter; and the SID should not include any
of the reserved words, such as DBA, COM, and KEY. More reserve words are given in the
install guide.
System Number
The system number is an identifier used for internal SAP processes. You are allowed to
choose any two-digit number from 00 to 98. This number should be unique if more than one
SAP system is to be installed on a single host.
SAPinst
SAPinst is the SAP install tool used to build the SAP application. The tool is delivered
along with the downloaded SAP software or the SAP shipped software. SAPinst drives the
entire installation based on the chosen install scenario.
SAP Installation Definitions/Terminology Starting from NW 7.1
The following terminology and component changes are seen starting with the NW 7.1 in-
stallation:
• The central instance (CI) is now called the “primary application server instance.”
• The dialog instance (DI) is now called the “additional application server instance.”
• The central system is now called the “standard system.”
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