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Shell Console Administrator • You can use Shell Console Administrator to display basic information for an SAP • NetWeaver AS Java system in a simple way. Shell Console Administrator is also • suitable for starting and stopping services. You cannot change VM parameters using • Shell Console Administrator. 18 October 2010
Memory Management in AS JAVA • The memory area of a Java Virtual Machine (JVM or VM) is mainly divided into three areas, which are called the young generation, the tenured generation, and the permanent generation. A "generation" reserves space in the address area of the host. • On start-up, the Virtual Machine allocates operating system memory for each "generation". This initially allocated memory area is called "initial" or initial size. • This occupancy of this space is administered internally by the VM.Once the initial space has been used, the VM allocates further operating system memory space in stages up to a maximum amount. This maximum value is defined in "max size". • The VM automatically takes care of the allocation of memory space for Java applications. The memory space is implicitly assigned when an object is created. • Even if a large amount of memory is required, this does not mean that the system is at risk. The VM determines which objects are no longer used and releases the memory areas which they currently occupy. This task is performed by the Special Java Agent named Garbage Collector (GC) which forms part of the VM. Its job is to prevent the occurrence of situations in which there is a danger of memory bottlenecks. • The memory space that is available is called the available memory or allocated memory. Since this space is reserved by the operating system, it is also referred to as .reserved. space since the entire space up to the maximum size is .available.. The space that is not yet reserved is called virtual memory. However, this should not be confused with the .virtual memory. of the operating system. If less space is required, the memory is returned to the operating system, also in stages. • The reserved memory space (available memory) is potentially available to the VM. However, it does not have to be used in full. The memory space that is actually used by Java applications is referred to as used memory. 18 October 2010
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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 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: Visual Administrator • With the V
Page 59 and 60: Explanation of the Term “Generati
Page 61 and 62: Exercise EXERCISE • Login to the
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