Expert Oracle Exadata - Parent Directory

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CHAPTER 6 MAKING PCBSSYS@EXDB1> /STATISTICVALUE------------------------------ --------Servers In Use 561 row selected.SYS@EXDB1> queued_sqlno rows selectedSYS@EXDB1> -- no queuing, lot’s of parallel slaves runningSYS@EXDB1>SYS@EXDB1> alter system set "_parallel_statement_queuing"=true; -- enable QueuingSystem altered.SYS@EXDB1> !ss.sh avgskew.sql 20 kso/ksostarting 20 copies of avgskew.sqlSYS@EXDB1> @queued_sqlSID SQL_ID SQL_EXEC_ID SQL_TEXT---- ------------- ----------- ----------------------------------------------181 05cq2hb1r37tr 16777363 select avg(pk_col) from kso.skew awhere col1 > 0216 1677736444 16777365273 16777366234 16777367160 16777368100 16777369233 1677737030 16777371138 167773727 16777373293 16777374137 1677737583 16777376251 1677737766 16777378123 16777379195 1677738018 rows selected.SYS@EXDB1> -- now we have control of which statements are parallelized and we have queuing159
CHAPTER 6 MAKING PCBSThis listing shows that you can have Parallel Statement Queuing without turning on Auto DOP. Ofcourse it’s using a hidden parameter, so you probably don’t want to do this on a production systemwithout discussing it with <strong>Oracle</strong> Support first.Controlling Queuing with HintsThere are two hints that can be used to control Parallel Statement Queuing at the statement level. Onehint, NO_STATEMENT_QUEUING, allows the queuing process to be completely bypassed, even if the feature isturned on at the instance level. The other hint, STATEMENT_QUEUING, turns on the queuing mechanism,even if the feature is not enabled at the instance level. The STATEMENT_QUEUING hint provides adocumented avenue for using the queuing feature without enabling Auto DOP. Here is an exampleshowing how to bypass the queuing by using the NO_STATEMENT_QUEUING hint.SYS@EXDB1> set echo onSYS@EXDB1> @test_pxq_hintSYS@EXDB1> -- this should cause queueing, but the hinted statementsSYS@EXDB1> -- should jump the queueSYS@EXDB1> alter system set "_parallel_statement_queuing"=true;System altered.SYS@EXDB1> alter system set parallel_servers_target=32;System altered.SYS@EXDB1> !ss.sh test_pxq_hint1.sql 10 kso/ksostarting 10 copies of test_pxq_hint1.sqlSYS@EXDB1> @queued_sqlSID SQL_ID SQL_EXEC_ID SQL_TEXT----- ------------- ----------- ------------------------------------------------------------484 bgcmmcyyyvpg9 16777239 select /*+ parallel (a 16) */ avg(pk_col) from kso.skew3 awhere col1 > 0774 bgcmmcyyyvpg9 16777240584 bgcmmcyyyvpg9 16777241199 bgcmmcyyyvpg9 16777242679 bgcmmcyyyvpg9 16777243391 bgcmmcyyyvpg9 167772441060 bgcmmcyyyvpg9 167772457 rows selected.SYS@EXDB1> !ss.sh test_pxq_hint2.sql 2 kso/ksostarting 2 copies of test_pxq_hint2.sql160
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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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CHAPTER 1 WHAT IS EXADATA?end of t
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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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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 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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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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