Expert Oracle Exadata - Parent Directory

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CHAPTER 1 WHAT IS EXADATA?Software ArchitectureIn this section we’ll briefly discuss the key software components and how they are connected in theExadata architecture. There are components that run on both the database and the storage tiers. Figure1-3 depicts the overall architecture of the Exadata platform.Oracle Database ServerCKPTRECOPMONSMONSGADatabase Buffer CacheShared PoolOtherDBWRShadowProcessesLGWRASMIDR / RDS over infinibandExadata Storage ServersMSManagementServerRSRestartServerStorage ServerShared MemoryCEL SRVOSWatcherCellinit.oraNon-Exadata Disksalert.logExadata Cell DisksFigure 1-3. Exadata architecture diagram18
CHAPTER 1 WHAT IS EXADATA?The top half of the diagram shows the key components on one of the database servers, while thebottom half shows the key components on one of the storage servers. The top half of the diagram shouldlook pretty familiar, as it is standard Oracle 11g architecture. It shows the System Global Area (SGA),which contains the buffer cache and the shared pool. It also shows several of the key processes, such asLog Writer (LGWR) and Database Writer (DBWR). There are many more processes, of course, and muchmore detailed views of the shared memory that could be provided, but this should give you a basicpicture of how things look on the database server.The bottom half of the diagram shows the components on one of the storage servers. Thearchitecture on the storage servers is pretty simple. There is really only one process (cellsrv) thathandles all the communication to and from the database servers. There are also a handful of ancillaryprocesses for managing and monitoring the environment.One of the things you may notice in the architecture diagram is that cellsrv uses an init.ora fileand has an alert log. In fact, the storage software bears a striking resemblance to an Oracle database.This shouldn’t be too surprising. The cellinit.ora file contains a set of parameters that are evaluatedwhen cellsrv is started. The alert log is used to write a record of notable events, much like an alert log onan Oracle database. Note also that Automatic Diagnostic Repository (ADR) is included as part of thestorage software for capturing and reporting diagnostic information.Also notice that there is a standalone process that is not attached to any database instance(DISKMON), which performs several tasks related to Exadata Storage. Although it is called DISKMON, it isreally a network- and cell-monitoring process that checks to verify that the cells are alive. DISKMON is alsoresponsible to propagating Database Resource Manager (DBRM) plans to the storage servers. DISKMONalso has a single slave process per instance, which is responsible for communicating between ASM andthe database it is responsible for.The connection between the database server and the storage server is provided by the InfiniBandfabric. All communication between the two tiers is carried by this transport mechanism. This includeswrites via the DBWR processes and LGWR process and reads carried out by the user foreground (orshadow) processes.Figure 1-4 provides another view of the architecture, which focuses on the software stack and how itspans multiple servers in both the database grid and the storage grid.19
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C H A P T E R 4Storage IndexesStora
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CHAPTER 4 STORAGE INDEXESMonitorin
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CHAPTER 4 STORAGE INDEXESIncorrect
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CHAPTER 4 STORAGE INDEXES---------
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C H A P T E R 5Exadata Smart Flash
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CHAPTER 5 EXADATA SMART FLASH CACH
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C H A P T E R 6Exadata Parallel Ope
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CHAPTER 6 MAKING PCBSParameter Def
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CHAPTER 6 MAKING PCBSTable 6-2. Hi
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CHAPTER 6 MAKING PCBSSo as you can
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CHAPTER 6 MAKING PCBS-- switch to
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CHAPTER 6 MAKING PCBSControlDescri
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CHAPTER 7 RESOURCE MANAGEMENTimpor
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CHAPTER 7 RESOURCE MANAGEMENTSQL>
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C H A P T E R 8Configuring ExadataO
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CHAPTER 8 CONFIGURING EXADATAThe P
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CHAPTER 9 RECOVERING EXADATAprovid
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CHAPTER 10 EXADATA WAIT EVENTSSYS@
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C H A P T E R 11Understanding Exada
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CHAPTER 11 UNDERSTANDING EXADATA P
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CHAPTER 12 MONITORING EXADATA PERF
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CHAPTER 13 MIGRATING TO EXADATA Ke
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C H A P T E R 14Storage LayoutIn Or
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CHAPTER 14 STORAGE LAYOUTFailure G
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CHAPTER 14 STORAGE LAYOUTGrid Disk
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CHAPTER 15 COMPUTE NODE LAYOUTCPU
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C H A P T E R 16Unlearning Some Thi
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CHAPTER 16 UNLEARNING SOME THINGS
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A P P E N D I X ACellCLI and dcliCe
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APPENDIX A CELLCLI AND DCLILIST FL
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APPENDIX A CELLCLI AND DCLICellCLI
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A P P E N D I X BOnline Exadata Res
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A P P E N D I X CDiagnostic Scripts
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APPENDIX C DIAGNOSTIC SCRIPTSScrip
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Index• AAccess control list (ACL)
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• INDEXnetwork componentsclient a
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• INDEX• Epredicate offload, 36
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• INDEXOTHER_GROUPS consumer grou
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• INDEXCPU utilization, 152mixed
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• INDEXstructure, 105sub-query, 1
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Expert Oracle Exadatan n nKerry Osb
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Contents• About the Authors......
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• CONTENTSHow to Verify That Smar
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• CONTENTSControlling ESFC Usage
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• CONTENTSSummary ...............
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• CONTENTS• Chapter 12: Monitor
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• CONTENTS• Chapter 16: Unlearn
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About the Technical Reviewer Kevin
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