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Central Services • The Central Services run on one host and form a separate Java instance. They consist of the message service and the enqueue service. • The Central Services provide the basis for communication and synchronization for the Java cluster: – The message service administers a list of the dispatchers and the server processes of the Java cluster. It represents the infrastructure of data exchange (for small quantities of data) between the nodes involved. In the case of load balancing between a large number of Java instances, it also provides the load balancing information for the SAP Web Dispatcher. – The enqueue service administers logical locks that are set in a server process by the executed application program. It is also used for cluster-wide synchronization. • The Central Services are essentially required when a Java cluster is installed. They are started on a host with a separate system number and the system ID (SID) of the entire system. If the Central Services are running, other Java instances are started with the program JControl (see the unit Starting and Stopping a SAP NetWeaver AS Java). 18 October 2010
Message & Enqueue Service • The message service performs the following tasks in the Java cluster: – Notification of events that arise in the cluster, for example, if a node of the cluster disappears (due to failure or the instance being shut down), or when a service is started or stopped. – Communication between different services – Forwarding of messages and requests to all participants (broadcast) – Prepare logon information for the SAP Web Dispatcher – Support for message server failover – Guaranteed message transmission – Exchange of cache information in the cluster • The enqueue service runs on the Central Services instance of the Java cluster. It manages the lock table in the main memory and receives requests for setting or releasing locks. It uses the tried and tested SAP lock concept. • The enqueue service has the following tasks: – Internally, it is used for synchronization within the Java cluster – The applications can lock objects are release locks again. The enqueue service processes these requests and manages the lock table with the existing locks. 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 and 20: Open SQL for JAVA • If the Java p
Page 21 and 22: The JAVA Instance Concept • SAP N
Page 23: Request Processing by the dispatche
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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