2.2 Distributed SystemAn SAP system consists of SAP instances. An SAP instance is a group of processes that are started andstopped at the same time.In a distributed system, every instance can run on a separate host, with the exception of the ASCSinstance and the SCS instance. The ASCS instance and the SCS instance must run on the same host:POË䪰 Central services instance for ABAP (ASCS instance)POË䪰 Enqueue replication server instance (ERS instance) for the ASCS instance (optional)POË䪰 Central services instance for Java (SCS instance)POË䪰 Enqueue replication server instance (ERS instance) for the SCS instance (optional)POË䪰 Database instance (DB)The ABAP stack and the Java stack use their own database schema in the same database.POË䪰 Primary application server instance (PAS)The graphics below assume that you use the global directories of the ASCS instance and SCS instanceas global file system. That means that the host with the ASCS and SCS is the SAP global host. However,you can also separately install the global directories on any host of your SAP system landscape.You can also use the SAP transport host or the host with the global file system (SAP global host) asyour primary application server instance host.Optionally you can install one or more additional application server instances. For more information,see Installation of an Additional Application Server Instance [page 18].
đang được dịch, vui lòng đợi..
