Expert Oracle Exadata - Parent Directory

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CHAPTER 13 MIGRATING TO EXADATAthe schema owner has read rights on the source table. Also, you probably don’t have to use this trick onall partitions of the table, as if your largest tables are time-partitioned by some order_date or similar,then you can probably transfer much of the old partitions before the downtime window, so you won’tneed to use such extreme measures.The techniques just discussed may seem quite complicated and time consuming, but if you havetens or hundreds of terabytes of raw data to extract, transfer, and compress, and all this has to happenvery fast, such measures are going to be useful. We have used these techniques for migrating VLDB datawarehouses up to 100TB in size (compressed with old-fashioned block compression) with raw data setsexceeding a quarter of a petabyte. However, we need to optimize our own time too, so read the nextsection about when it is feasible to go with database links and when it is not.When to Use CTAS or IAS over Database LinksIf you have allocated plenty of downtime, and the database to be migrated isn’t too big, and you don’twant to do major reorganization of your database schemas, then you probably don’t have to use dataload over database links. A full DataPump export/import is much easier if you have the downtime anddisk space available; everything can be exported and imported with a simple command.However, when you are migrating VLDBs with low downtime windows, database links can provideone performance advantage—with database links you don’t have to dump the data to a disk file just tocopy it over and reload it back in the other server. Also, you don’t need any intermediate disk space forkeeping dumps when using database links. With database links you read the data from disk once (in thesource database), transfer it over the wire, and write it to disk once in the target.Transferring lots of small tables may actually be faster with the Export/Import or Data Pumpmethod. Also, the other schema objects (views, sequences, PL/SQL, and so on) have to be somehowmigrated anyway. So it’s a good idea to transfer only the large tables over database links and useExport/Import or Data Pump for migrating everything else. And by the way, Data Pump has a niceEXCLUDE: parameter you can use for excluding the large manually transferred tables from an export job.What to Watch Out For When Copying Tables over Database LinksCopying tables during business hours can impact performance on the source database. It can also put aload on the network, sometimes even when dedicated network hardware is installed for reducing theimpact of high-throughput data transfer during production time.Table 13-3 shows a summary of the capabilities of each of these Extract and Load methods.Table 13-3. When to Use Extract and LoadRequirement Data Pump Export/Import Database LinkSchema Changes Yes Yes YesTable/Index Storage Changes Yes Yes 1 YesTablespace Changes Yes No Yes442
CHAPTER 13 MIGRATING TO EXADATARequirement Data Pump Export/Import Database LinkData Is Encrypted (TDE) Yes No YesDatabase Version
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For your convenience Apress has pla
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IntroductionThank you for purchasin
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INTRODUCTIONwere implementing Exada
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C H A P T E R 2Offloading / Smart S
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CHAPTER 2 OFFLOADING / SMART SCANR
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C H A P T E R 3Hybrid Columnar Comp
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CHAPTER 3 HYBRID COLUMNAR COMPRESS
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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 INDEXES---------
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CHAPTER 4 STORAGE INDEXES1 row sel
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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 7 RESOURCE MANAGEMENTimpor
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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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CHAPTER 10 EXADATA WAIT EVENTScell
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C H A P T E R 11Understanding Exada
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CHAPTER 12 MONITORING EXADATA PERF
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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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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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