Expert Oracle Exadata - Parent Directory

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CHAPTER 16 UNLEARNING SOME THINGS WE THOUGHT WE KNEW==== turn off smart scansSYS@SANDBOX1> alter session set "_serial_direct_read"=true;Session altered.Elapsed: 00:00:00.01SYS@SANDBOX1> alter session set cell_offload_processing=false;Session altered.Elapsed: 00:00:00.00SYS@SANDBOX1> alter system flush buffer_cache;System altered.Elapsed: 00:00:01.99SYS@SANDBOX1> select avg(length(c)) from tanel.t_chained2;AVG(LENGTH(C))--------------4000Elapsed: 00:00:08.78 alter session set "_serial_direct_read"=false;Session altered.Elapsed: 00:00:00.01SYS@SANDBOX1> alter system flush buffer_cache;System altered.Elapsed: 00:00:00.14SYS@SANDBOX1> select avg(length(c)) from tanel.t_chained2;AVG(LENGTH(C))--------------4000Elapsed: 00:00:09.35 alter session set "_serial_direct_read"=true;521
CHAPTER 16 UNLEARNING SOME THINGS WE THOUGHT WE KNEWSession altered.Elapsed: 00:00:00.00SYS@SANDBOX1> alter session set cell_offload_processing=true;Session altered.Elapsed: 00:00:00.00SYS@SANDBOX1> alter system flush buffer_cache;System altered.Elapsed: 00:00:00.08SYS@SANDBOX1> select avg(length(c)) from tanel.t_chained2;AVG(LENGTH(C))--------------4000Elapsed: 00:01:59.24 @fsx4Enter value for sql_text: select avg(length(c)) from tanel.t_chained2Enter value for sql_id:SQL_ID CHILD OFFLOAD IO_SAVED_% AVG_ETIME SQL_TEXT--------------------------------------------------------------------------------------3upcma5nsnbcd 0 Yes -27.41 159.24 select avg(length(c)) from tanel.t_chainElapsed: 00:00:00.06Notice that the statement was offloaded and that the IO_SAVED_% calculation produced a negativenumber. This shows that more bytes were returned by the storage cells than the total number of bytesthat the table occupies. It’s clear from this example that chained rows can be much more detrimental toperformance when attempting to make use of <strong>Exadata</strong>’s Smart Scans than to queries that are handled innormal block-shipping mode. It’s worth noting that this is an extreme example, as every row waschained. In fact, many of the records spanned three blocks. In this extreme case, it is clear that avoidingoffloading actually improves the performance significantly. Of course, eliminating the chained rowswould be the best solution.Very Busy CellsWhen a storage cell becomes very busy with CPU operations, it is possible for the storage software tobegin refusing to perform offload activities on some portion of the requests. That is, if a particular cellbecomes extremely busy and is getting offloadable requests from a database server that is notparticularly busy, it may decide to send some data back to the database server that has not beenprocessed or has only partially been processed. In some cases column projection may be done but notfiltering, in other cases, cellsrv may revert to shipping entire blocks back to the database layer. So whilethis issue does not result in a complete shutdown of offloading, it can reduce the amount of work that isdone on the storage tier.522
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IntroductionThank you for purchasin
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INTRODUCTIONwere implementing Exada
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CHAPTER 1 WHAT IS EXADATA?end of t
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CHAPTER 1 WHAT IS EXADATA? Kevin S
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CHAPTER 1 WHAT IS EXADATA?Limited
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CHAPTER 1 WHAT IS EXADATA? Kevin S
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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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CHAPTER 2 OFFLOADING / SMART SCANS
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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 INDEXESVersion:
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CHAPTER 4 STORAGE INDEXES• For e
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CHAPTER 4 STORAGE INDEXESSYS@EXDB1
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CHAPTER 4 STORAGE INDEXESpositives
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CHAPTER 4 STORAGE INDEXESIncorrect
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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 6 MAKING PCBS((4 × CPU_co
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CHAPTER 6 MAKING PCBSSYS@EXDB1> /S
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CHAPTER 6 MAKING PCBSSYS@EXDB1> @q
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CHAPTER 6 MAKING PCBSControlDescri
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CHAPTER 6 MAKING PCBSthe normal ca
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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 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 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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Page 512 and 513: C H A P T E R 16Unlearning Some Thi
Page 514 and 515: CHAPTER 16 UNLEARNING SOME THINGS
Page 536 and 537: A P P E N D I X ACellCLI and dcliCe
Page 538 and 539: APPENDIX A CELLCLI AND DCLILIST FL
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Page 546 and 547: A P P E N D I X BOnline Exadata Res
Page 548 and 549: A P P E N D I X CDiagnostic Scripts
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Page 552 and 553: Index• AAccess control list (ACL)
Page 554 and 555: • INDEXnetwork componentsclient a
Page 556 and 557: • INDEX• Epredicate offload, 36
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Page 560 and 561: • INDEXCPU utilization, 152mixed
Page 562 and 563: • INDEXstructure, 105sub-query, 1
Page 564 and 565: Expert Oracle Exadatan n nKerry Osb
Page 566 and 567: Contents• About the Authors......
Page 568 and 569: • CONTENTSHow to Verify That Smar
Page 570 and 571: • 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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