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Chapter 19: PerformanceR/3Analysis of transaction ST02 is covered in BC315 (the Workload Analysis and Tuningclass). We recommend you take this class.A computer’s memory behaves similar to a hard disk. As different programs execute, theyare loaded into, and later deleted out of, memory. Over time, like a hard disk, the usage ofthe computer’s memory becomes fragmented with unused spaces scattered throughout.At a certain point you may have sufficient “free memory” (that is, the total of all the unusedspaces), but not a contiguous (single) piece of memory large enough to allow certainprograms to execute. At that point, those types of programs attempting to run that needcontiguous memory will fail because they cannot be loaded into memory.To defragment the system’s memory:1. Stop R/3.This step requires stopping R/3 on all application and database servers. (For moreinformation, see Start/Stop R/3 in chapter 10.)2. Restart R/3.You only need to restart R/3, you do not need to cycle the server.When R/3 is restarted, the buffers are refreshed. This process means that the first personwho accesses the buffered object will have a long response because the system must get thedata from disk and load it into the buffer. The second person will have a normal (quick)response time. This process repeats until all normally used objects are loaded into thebuffer, which usually takes up to a day to accomplish.19–10Release 4.6A/B
Chapter 19: PerformanceDatabaseSee chapter 13 (Database Administration – Microsoft SQL Server) for the database-relatedperformance tuning transactions: Activity - ST04 Tables/Indexes - DB02The operating system monitor allows you to view relevant operating system and hardwaredetails.The operating system-related detail, such as: Memory paging Operating system logIn addition, the following hardware details are available: CPU utilization Free space on disksCertain operating system items will impact R/3 performance.System Administration Made Easy19–11
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®Ã TM R/3 System Release 4.6A/BS
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System Administration Made Easyiii
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What Is This Guidebook About?......
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Detailed Table of ContentsWhen the
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Detailed Table of ContentsStarting
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Detailed Table of ContentsDefine Fi
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Detailed Table of ContentsHousekeep
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Detailed Table of ContentsEnter the
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Detailed Table of ContentsOther....
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The combined experience in SAP and
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What Is This Guidebook About? .....
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IntroductionWho Should Read This Bo
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IntroductionHow to Use This Guidebo
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IntroductionSpecial IconsThe screen
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Overview ..........................
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Chapter 1: R/3 System Administratio
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Overview ..........................
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Chapter 2: Disaster RecoveryWhy Pla
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Chapter 2: Disaster RecoveryPlannin
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Chapter 2: Disaster RecoveryTest yo
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Chapter 3: Backup and RecoveryBacku
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Chapter 3: Backup and RecoveryPerfo
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Overview ..........................
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Chapter 4: Scheduled Daily TasksCri
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Chapter 7: Scheduled Quarterly Task
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The R/3 System ....................
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Chapter 8: Scheduled Annual TasksNo
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Starting the R/3 System............
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Chapter 9: Multi-Role TasksStarting
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Chapter 9: Multi-Role TasksStopping
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Overview ..........................
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Chapter 10: R/3 System Administrati
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Overview ..........................
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Chapter 11: Security Administration
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Overview ..........................
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Chapter 12: User AdministrationReco
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Chapter 12: User AdministrationDele
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Overview ..........................
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Chapter 13: Database Administration
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Contents...........................
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Chapter 14: Output ManagementPrinte
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Chapter 14: Output ManagementCheck
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Chapter 15: Network/OS/Server Admin
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Chapter 16: OperationsBackground (B
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Chapter 16: OperationsBackupsA full
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Chapter 16: OperationsBackups5. To
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Chapter 16: OperationsChecking Cons
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Table Maintenance (Transaction SM31
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Chapter 17: Change ManagementTable
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Chapter 22: Remote ServicesRetrievi
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Chapter 22: Remote ServicesEarlyWat
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Chapter 23: Special MaintenanceChan
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Chapter 23: Special MaintenanceProd
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Useful Transactions................
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Appendix A: Useful TransactionsUsef
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Other System Administration Resourc
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Appendix B: Useful Resources and Pr
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Overview ..........................
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Appendix C: Useful SAP NotesR/3 Not
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Appendix C: Useful SAP NotesR/3 Not
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Appendix C: Useful SAP NotesOperati
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Appendix C: Useful SAP NotesDatabas
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Upgrade Discussion ................
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Appendix D: Upgrade DiscussionUpgra
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AABAPdump analysisfree selection, 1
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Indexweekly tasksdatabase, 5-3notes
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IndexMMaintenancebasic, 23-4contrac
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IndexRestorereasons for, 3-2strateg
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Indexrecordation, 1-7single points
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Indexnotes, 5-4operating system, 5-
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