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Lock Management • The lock concept of the database is used in the J2EE standard. So if application developers make sure that they implement database-independent database accesses,the application will be portable but will respond semantically different on different database platforms. For this reason and to improve response times, SAP introduced the concept of the enqueue service analogous to AS ABAP. 18 October 2010
The JAVA Instance Concept • SAP NetWeaver Application Server Java takes the instance concept of SAP Basis, which combines multiple components that are monitored, started, and stopped together into an administrative unit. • The following components are part of a Java instance: – The server processes provide the infrastructure in which the J2EE applications run. – The Java dispatcher distributes the client requests to the free server processes of the instance. • An instance always runs on one physical server, but there can be multiple instances on one server. Within an SAP system, an instance is defined using the system ID (SID) of the SAP system and the instance number. An SAP system consists of a database and one or more instances. These instances can either be purely ABAP or Java instances, or instances with ABAP and Java infrastructure. • The Central Services form a special Java instance. They provide the basis of communication and synchronization within a Java cluster. The central instance is another special instance. This runs on a physical server with the Central Services. • During its installation, the Software Deployment Manager is also installed. 18 October 2010
Page 1 and 2: SAP BASIS Introductory Training Pro
Page 3 and 4: AS JAVA Architecture & Processes 18
Page 5 and 6: SAP AS JAVA Instance Central Instan
Page 7 and 8: Summary of AS JAVA Processes The fo
Page 9 and 10: AS JAVA Architecture • In AS Java
Page 11 and 12: Key architecture principles of Dual
Page 13 and 14: Details on request processing • T
Page 15 and 16: Transaction Processing in AS JAVA 1
Page 17 and 18: Details on Managers & Services •
Page 19: Open SQL for JAVA • If the Java p
Page 23 and 24: Request Processing by the dispatche
Page 25 and 26: Message & Enqueue Service • The m
Page 27 and 28: Services in the AS JAVA • The ser
Page 29 and 30: Startup & Shutdown Of AS JAVA Insta
Page 31 and 32: Sequence of Startup • The SAP Sys
Page 33 and 34: Stopping AS JAVA in UNIX • The st
Page 35 and 36: Starting/Stopping a pure AS JAVA in
Page 37 and 38: Process Information 18 October 2010
Page 39 and 40: SMICM Details • In the case of SA
Page 41 and 42: Start/Stop in UNIX • For SAP syst
Page 43 and 44: Details on the Framework • SAP pr
Page 45 and 46: Location in Windows 18 October 2010
Page 47 and 48: JCMON Tool • The JCmon tool can b
Page 49 and 50: Logs & Trace Files in AS JAVA 18 Oc
Page 51 and 52: Administration & Configuration Tool
Page 53 and 54: Features of the Config Tool • The
Page 55 and 56: Visual Administrator • With the V
Page 57 and 58: Memory Management in AS JAVA • Th
Page 59 and 60: Explanation of the Term “Generati
Page 61 and 62: Exercise EXERCISE • Login to the

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