Expert Oracle Exadata - Parent Directory

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CHAPTER 16 UNLEARNING SOME THINGS WE THOUGHT WE KNEW Note: The issue of whether to gather system statistics on <strong>Exadata</strong> comes up fairly often. System statistics aredesigned to provide additional information to the optimizer about the behavior characteristics of the hardware. Inparticular, they provide values for average single-block and average multi-block read times. Since <strong>Exadata</strong> oftenavoids actually performing multi-block reads, using Smart Scans instead, it seems counterintuitive to provideinformation to the optimizer about an operation that will seldom be used, particularly when this is one of the maininputs into the optimizer’s cost calculations. If that argument is not enough for you, then please review MOS Note1094934.1, which specifically states:Note:It is currently not necessary to gather system statistics on the database machine.Optimizer ParametersThere are a couple of initialization parameters that can push the optimizer toward or away from indexusage. The parameters OPTIMZER_INDEX_CACHING and OPTIMIZER_INDEX_COST_ADJ can both be used for thispurpose. While these are big knobs that can affect the core functionality of the optimizer, they weredesigned for the very purpose of making indexes more or less attractive to the optimizer. Using theparameters in a limited way, such as with an alter session command before running large batchprocesses, is a viable approach in some cases. These parameters can also be set at the statement levelusing the OPT_PARAM hint. Here’s a very simple example:SYS@SANDBOX> @bloom_join2.sqlCOL2SUM(A.COL1)-----------------------------------------asddsadasd 1535984162342 144Elapsed: 00:03:21.39SYS@SANDBOX> alter session set optimizer_index_cost_adj=10000;Session altered.Elapsed: 00:00:00.07SYS@SANDBOX> @bloom_join2.sql531
CHAPTER 16 UNLEARNING SOME THINGS WE THOUGHT WE KNEWCOL2SUM(A.COL1)-----------------------------------------asddsadasd 1535984162342 144Elapsed: 00:01:08.64SYS@SANDBOX1> @dplanEnter value for sql_id: 09m6t5qpgkywxEnter value for child_no:PLAN_TABLE_OUTPUT--------------------------------------------------------------------------------------------SQL_ID 09m6t5qpgkywx, child number 0-------------------------------------select /*+ bloom join 2 use_hash (skew temp_skew) */ a.col2,sum(a.col1) from kso.skew3 a, kso.skew2 b where a.pk_col = b.pk_col andb.col1 = 1 group by a.col2Plan hash value: 466947137-----------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|-----------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | | | 37239 (100)|| 1 | PX COORDINATOR | | | | || 2 | PX SEND QC (RANDOM) | :TQ10002 | 2 | 66 | 37239 (1)|| 3 | HASH GROUP BY | | 2 | 66 | 37239 (1)|| 4 | PX RECEIVE | | 2 | 66 | 37239 (1)|| 5 | PX SEND HASH | :TQ10001 | 2 | 66 | 37239 (1)|| 6 | HASH GROUP BY | | 2 | 66 | 37239 (1)||* 7 | HASH JOIN | | 1706 | 56298 | 37238 (1)|| 8 | BUFFER SORT | | | | || 9 | PX RECEIVE | | 142 | 1562 | 131 (0)|| 10 | PX SEND BROADCAST | :TQ10000 | 142 | 1562 | 131 (0)|| 11 | TABLE ACCESS BY INDEX ROWID| SKEW2 | 142 | 1562 | 131 (0)||* 12 | INDEX RANGE SCAN | SKEW2_COL1 | 142 | | 3 (0)|| 13 | PX BLOCK ITERATOR | | 384M| 8056M| 37020 (1)||* 14 | TABLE ACCESS STORAGE FULL | SKEW3 | 384M| 8056M| 37020 (1)|-----------------------------------------------------------------------------------------Predicate Information (identified by operation id):---------------------------------------------------7- access("A"."PK_COL"="B"."PK_COL")12- access("B"."COL1"=1)14- storage(:Z>=:Z AND :Z
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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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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? Note: H
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CHAPTER 1 WHAT IS EXADATA?StorageS
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CHAPTER 1 WHAT IS EXADATA?Adapters
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CHAPTER 1 WHAT IS EXADATA? Kevin S
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CHAPTER 1 WHAT IS EXADATA?Notice t
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CHAPTER 1 WHAT IS EXADATA?Software
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CHAPTER 1 WHAT IS EXADATA?Single I
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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 SCAN3
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CHAPTER 2 OFFLOADING / SMART SCANm
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CHAPTER 2 OFFLOADING / SMART SCANo
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CHAPTER 2 OFFLOADING / SMART SCANS
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CHAPTER 2 OFFLOADING / SMART SCAN|
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CHAPTER 2 OFFLOADING / SMART SCANX
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CHAPTER 2 OFFLOADING / SMART SCANC
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CHAPTER 2 OFFLOADING / SMART SCANe
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CHAPTER 2 OFFLOADING / SMART SCANa
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CHAPTER 2 OFFLOADING / SMART SCANs
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CHAPTER 2 OFFLOADING / SMART SCAN-
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CHAPTER 2 OFFLOADING / SMART SCANF
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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 INDEXES• _cell
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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-- switch to
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CHAPTER 6 MAKING PCBSThe Old WayBe
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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 6 MAKING PCBSEnter value f
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CHAPTER 6 MAKING PCBSphysical read
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CHAPTER 6 MAKING PCBStransaction t
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CHAPTER 6 MAKING PCBSSYS@EXDB1> se
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CHAPTER 7 RESOURCE MANAGEMENTimpor
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CHAPTER 7 RESOURCE MANAGEMENTSQL>
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CHAPTER 7 RESOURCE MANAGEMENTSessi
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CHAPTER 7 RESOURCE MANAGEMENTrelat
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CHAPTER 7 RESOURCE MANAGEMENTcomme
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CHAPTER 7 RESOURCE MANAGEMENTStep
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CHAPTER 7 RESOURCE MANAGEMENTgroup
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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 8 CONFIGURING EXADATAregis
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CHAPTER 8 CONFIGURING EXADATATable
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CHAPTER 9 RECOVERING EXADATAprovid
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CHAPTER 9 RECOVERING EXADATANetmas
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CHAPTER 9 RECOVERING EXADATASystem
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CHAPTER 9 RECOVERING EXADATA-rw-r-
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CHAPTER 9 RECOVERING EXADATASYS:+A
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CHAPTER 9 RECOVERING EXADATA■ No
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CHAPTER 10 EXADATA WAIT EVENTSSYS@
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CHAPTER 10 EXADATA WAIT EVENTScell
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CHAPTER 10 EXADATA WAIT EVENTSreli
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CHAPTER 10 EXADATA WAIT EVENTSPARS
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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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CHAPTER 13 MIGRATING TO EXADATA2.
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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 14 STORAGE LAYOUTASM Disk
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CHAPTER 14 STORAGE LAYOUT1 st Grid
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CHAPTER 14 STORAGE LAYOUTTable 14-
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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
Page 558 and 559: • INDEXOTHER_GROUPS consumer grou
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
Page 572 and 573: • CONTENTSSummary ...............
Page 574 and 575: • CONTENTS• Chapter 12: Monitor
Page 576 and 577: • CONTENTS• Chapter 16: Unlearn
Page 578 and 579: About the Technical Reviewer Kevin
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