Expert Oracle Exadata - Parent Directory

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CHAPTER 6 MAKING PCBS((4 × CPU_count) × parallel_threads_per_cpu) × active_instancesSo on an Exadata X2-2 with a database that spans 4 RAC nodes, the default value would becalculated as:((4 × 12)× 2) × 4 = 384This calculated value is almost certainly higher than you would want for most mixed workloadsystems, as it is geared at completely consuming the available CPU resources with parallel queryprocesses. Allowing long-running parallel statements to consume the server completely means thatresponse-sensitive, OLTP-type statements, could suffer. You should also note that it is possible to havemore server processes active than the parameter allows. Since the number of slaves assigned to a querymay be twice the DOP, the target can occasionally be exceeded.The second parameter that deserves some discussion is the hidden parameter,_PARALLEL_STATEMENT_QUEUING, which turns the feature on and off. As already discussed in the Auto DOPsection, this parameter is set to TRUE when the PARALLEL_DEGREE_POLICY parameter is set to AUTO.However, the hidden parameter can also be set manually to turn Parallel Queuing off and onindependently.Auto DOP calculations are still a little scary. So it’s nice that there is a way to turn on the ParallelQueuing feature without enabling Oracle to take complete control of which statements run in parallel.Of course since this involves setting a hidden parameter you should not do this in a productionenvironment without approval from Oracle support. Nevertheless, here’s another quick exampleshowing that queuing can be turned on without enabling Auto DOP or In-memory Parallel Execution:SYS@EXDB1> alter system set parallel_degree_policy=manual;System altered.SYS@EXDB1> alter table kso.skew parallel (degree 8);Table altered.SYS@EXDB1> @parmsEnter value for parameter: parallel%Enter value for isset:Enter value for show_hidden:NAME VALUE ISDEFAUL---------------------------------- ------------------------------ --------parallel_adaptive_multi_user FALSE TRUEparallel_automatic_tuning FALSE TRUEparallel_degree_limit 8 FALSEparallel_degree_policy MANUAL FALSEparallel_execution_message_size 16384 TRUEparallel_force_local TRUE FALSEparallel_instance_groupTRUEparallel_io_cap_enabled FALSE TRUEparallel_max_servers 320 TRUEparallel_min_percent 0 TRUEparallel_min_servers 16 FALSEparallel_min_time_threshold 2 TRUEparallel_server TRUE TRUEparallel_server_instances 2 TRUE157
CHAPTER 6 MAKING PCBSparallel_servers_target 10 FALSEparallel_threads_per_cpu 2 TRUE16 rows selected.SYS@EXDB1> !ss.sh avgskew.sql 20 kso/ksostarting 20 copies of avgskew.sqlSYS@EXDB1> @queued_sqlno rows selectedSYS@EXDB1> @queued_sqlno rows selectedSYS@EXDB1> @check_pxSYS@EXDB1> /STATISTICVALUE------------------------------ --------Servers In Use 481 row selected.SYS@EXDB1> /STATISTICVALUE------------------------------ --------Servers In Use 561 row selected.SYS@EXDB1> /STATISTICVALUE------------------------------ --------Servers In Use 641 row selected.SYS@EXDB1> /STATISTICVALUE------------------------------ --------Servers In Use 481 row selected.158
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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?Limited
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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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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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C H A P T E R 11Understanding Exada
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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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