DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

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PQ84160 378, 387 PQ85764 387 PQ85843 388 PQ86037 388 PQ86049 388 PQ86071 335, 378 PQ86074 379 PQ86201 379 PQ86477 204, 379, 388 PQ86787 305, 379 PQ86904 327, 379 PQ87126 305, 379, 388 PQ87129 305, 379 PQ87168 327, 379 PQ87381 379, 388 PQ87390 379 PQ87447 379, 388 PQ87509 275, 379 PQ87611 172, 379 PQ87756 327, 379 PQ87764 157 PQ87783 388 PQ87848 210, 379 PQ87917 379, 388 PQ87969 39, 379 PQ88073 379, 417 PQ88224 365 PQ88375 275, 380 PQ8841 179 PQ88582 307, 380 PQ88587 388 PQ88665 229, 380 PQ88784 24 PQ88896 368, 380 PQ89070 215, 380 PQ89181 39 PQ89297 380, 388 PQ89919 335, 380, 389 PQ90022 111, 259, 380, 389 PQ90075 380, 389 PQ90147 260, 380 PQ90263 380, 389 PQ90547 365, 380 PQ90884 275, 277, 280, 380 PQ91009 353, 380 PQ91101 158, 163, 365, 381, 389 PQ91493 381 PQ91509 313, 381 PQ91898 39, 381 PQ92072 381 PQ92227 254, 381 PQ92749 262, 268, 381 PQ93009 389 PQ93156 381 PQ93458 285 PQ93620 39, 381 PQ93821 111, 259, 381, 389 PQ93943 190 PQ9414 381 PQ94147 389 436 DB2 UDB for z/OS Version 8 Performance Topics PQ94303 381 PQ94793 389 PQ94822 190, 381 PQ94872 158, 163, 365, 381 PQ94923 381 PQ95164 221, 225, 381 PQ95881 304, 381 PQ95989 365 PQ96189 213, 381 PQ96628 382, 389 PQ96772 143, 152, 382 PQ96956 262, 268, 382 PQ97794 382 PQ99181 380 PQ99482 39 PQ99524 382, 389 PQ99608 382 PQ99658 xxii, 382, 389 PQ99707 xxii, 313, 382 PQTY 228 PRECISION 68 Precompiler 23, 354 NEWFUN 23, 354 PREFETCH 12, 158, 160, 170, 221, 225, 229, 319, 321, 324, 333, 395, 400, 402, 405, 412 Print Log Map utility 283 PRIQTY 226, 228–229 Private Protocol 284 PT 143 Q Q3STHWCT 205 Q3STHWIB 205 Q3STHWIF 205 QMF 212, 408 QMF for TSO/CICS 8.1 39 Qualified partitions 256 QUALIFIER 259, 408 QUERY 219 Query parallelism 29, 78, 254, 413 QUERYNO 50, 400, 402, 405, 410, 415–416 QUIESCE 263, 327, 331, 370 Quotation mark 272 R RACF 26, 139, 191–198 RACROUTE 26 RBA 256, 358 RBDP 231–232, 236 RBLP 220 RDS 158, 160, 164, 395 RDS sort 144 Read For Castout Multiple 321 READS interface 211 Read-up 194 Real contention 329 Real memory 18, 153, 165 Real storage 3, 9, 11, 13, 17, 19, 21, 65, 97, 127, 129, 138, 142, 148, 153–154, 156–158, 165, 169–171, 174,
201, 320, 339, 365, 397 REBALANCE 245 Rebalance partitions 3, 233 REBUILD INDEX 132, 202, 235, 237–238, 242, 249, 252, 263 Rebuild pending 231–232 RECOVER 4, 21, 133, 183, 217–221, 233, 257, 320, 336, 367 Recovery base log point 220 Recursive SQL 6 Common table expressions 6 Redbooks Web site 427 Contact us xxviii Reduced lock contention 7 REFRESH DEFERRED 40 refresh MQTs 41 REFRESH TABLE 40–42, 53, 124 REGION 142, 158, 161, 173, 396 REMARKS 412 REORG 4, 8, 11, 132, 197, 202, 226, 230–231, 233–235, 240, 242, 244–245, 247–248, 255, 258, 264, 268–269, 354, 356, 359, 371 Clustering order 268 DISCARD 5, 197 Implicit clustering index 247 REBALANCE 244–245 REORG INDEX 133 REORG TABLESPACE 197, 233 REBALANCE 233 REORG utility enhancements 5 REORP 233 REPORT 7, 73–74, 116, 118, 122–123, 149, 162, 164, 166, 207, 213, 258, 276, 328–330, 334, 365, 394 Requester database ALIAS 281, 283 RESET 16, 209, 236 Residual predicates 66 Resource Security label 192–193 RESTART 218, 221, 256, 326–327, 331, 337 Restart light enhancements 320, 337 RESTART WITH 221 RESTORE 4, 261, 367 RESTORE SYSTEM 4, 21, 217–218, 220–221, 224–226 RESTRICT 94 Retained locks 172, 325, 337 RETVLCFK 232 Reverse dominance 194 RFCOM 321–322 RID 402, 404 RID Pool 3, 17, 140, 144, 148–149, 153, 158, 160, 394–395 RIDBLOCK 145 RIDLIST 145 RIDLISTs 144 RIDMAP 145 RIDs 73, 115, 145 RMF 26, 148, 166, 322, 324, 328–329 ROLLBACK 206, 332, 368 ROWID 5 Rowset 29, 31, 33, 92, 94, 103, 105, 288–290, 292 Rowsets 31, 33, 288–289 RQRIOBLK 285 RRSAF 8, 208, 296 RUNSTATS 7, 53, 71, 73, 76, 110–111, 115–117, 122–124, 132, 231, 238, 240, 242, 246, 248, 253, 273, 275–278, 280, 401–403, 405 RUNSTATS enhancement 272 S SBCS 22, 174, 180, 185–186, 342–343, 414 SCA 220, 320, 336 Scalability xxv, 3, 9, 12, 20, 128–129, 212 SCHEMA 54, 65, 217, 230, 233, 259, 353, 416 Schema changes 230 Schema evolution xxv, 3–4, 217, 230, 261 SECDATA 192 SECLABEL 192–193, 195–198, 212 SECLEVEL 192, 198 secondary AUTHIDs 260 Secondary authorization ID information 212 Secondary index 4, 247–248, 274 Clustering index 247 SECQTY 226, 229 secure key 189 Security Object 192 Security category 192 Security label 192–194, 198, 212 Security labels 192–194, 198 Assigning 193 Defining 192 Security level 192, 194 Security policy 191 Security Server 191–192, 212 SENSITIVE DYNAMIC 94, 96, 101, 105 SENSITIVE STATIC 93–94, 100, 104 Separation of partitioning and clustering 4 Serialized profile 300 Server location ALIAS 281, 283 service time 9 SET 34, 172, 226 SET clause in the SQL UPDATE 199 SET CURRENT REFRESH AGE ANY 42 SET DPTDPTSZ 87 SET ENCRYPTION PASSWORD 188 SET QUERYNO 50 -SET SYSPARM 256 Shift-in 185, 344 Shift-out 185, 344 short prepare 146 SIGNON 206, 260 SJMXPOOL 54, 57, 65 SKCT 143 SKPT 143, 357 SMF 26, 128, 136, 213, 351 SMF89 213–214 SMFSTST 26 SMS-managed data sets 218 Sort pool 3, 17, 144, 148–149, 153, 156 SORT pools 144 Index 437
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ibm.com/redbooks Front cover DB2 UD
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Note: Before using this information
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2.5.3 Increased number of deferred
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4.5.2 Conclusion . . . . . . . . .
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7.4.1 ODBC Unicode support . . . .
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x DB2 UDB for z/OS Version 8 Perfor
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3-48 Consistency query - 31 New . .
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xiv DB2 UDB for z/OS Version 8 Perf
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8-5 CF Request Batching - DB2 CPU .
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xviii DB2 UDB for z/OS Version 8 Pe
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Trademarks The following terms are
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Added information The following APA
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► Added reference to June 15, 200
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Michael Parbs is a DB2 Specialist w
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Hugh Smith Jim Teng John Tobler Yoi
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xxx DB2 UDB for z/OS Version 8 Perf
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1.1 Overview 1.1.1 Architecture IBM
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- Column data type changes can be d
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1.1.3 Data warehouse 1.1.4 Performa
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Volatile (or cluster) tables, used
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In this chapter we anticipate the a
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2.1.3 I/O time 2.1.4 Virtual storag
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► The performance benchmarks for
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application that can have great pot
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Because you can significantly incre
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The possible increase in thread foo
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2.5.9 Unicode parser Important: Con
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You can keep the DBRMs in EBCDIC fo
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Macro Parameter Old value New value
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28 DB2 UDB for z/OS Version 8 Perfo
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► Parallel sort enhancement Paral
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Characteristics of the host variabl
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3.1.4 Performance Update 10 rows us
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► Complexity of the fetch. The fi
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► More rows per one SQL statement
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3.2.1 Creating MQTs MQTs compared t
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Special register CURRENT REFRESH AG
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the materialized query table. If it
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Figure 3-9 MQTs and short running q
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► The elapsed time is 22 times sm
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Figure 3-13 Regrouping on MQT resul
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EVE.EXT = 'ADD BILL' AND EVE.TXC =
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Star Schema Figure 3-15 Star schema
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merge joins and work file usage. DB
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Star join access path without a spa
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3.3.4 Performance Sparse index for
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V8 Star Join Access Path Figure 3-2
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3.3.5 Conclusion Star join workload
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. SELECT * FROM PAOLO.TORDER WHERE
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But not all mismatched numeric type
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V8 shows that PL is joined with CV
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Query performance problem Lack of m
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3.5.1 Performance SORTDEVT SYSDA IN
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3.5.2 Conclusions Figure 3-31 Acces
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Mismatched data types SELECT COUNT(
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3.7.1 Performance In V8 the paralle
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3.7.2 Conclusions Example 3-9 Multi
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3.8.2 Performance We show three exa
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3.8.3 Conclusion The measurements s
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100 Inserts activated trigger 100 t
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3.10.2 Conclusion 100 Inserts activ
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stores the selected columns from ea
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While there is no optimistic lockin
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FETCH FROM Figure 3-45 FETCH syntax
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► Measurement data collected with
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application has decidedly higher Cl
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Static updatable cursor You can see
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Multi-row FETCH with a static curso
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3.12.5 Conclusion Multi-row FETCH a
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While, for or SELECT ... FROM ...
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3.14.2 Conclusion Percent reduction
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3.15.1 Installation commands. Of co
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Figure 3-47 Explain of the old cons
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in ms = 1 and the CPU cost is 16 se
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Figure 3-50 Suggested RUNSTATS stat
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Looking at the explanation, we can
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The Plug-In Options screen of Stati
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Before the introduction of MQTs, DB
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126 DB2 UDB for z/OS Version 8 Perf
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► Larger VSAM CI sizes: DB2 V8 in
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4.1.1 Performance support caused al
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Regression is about 5% better than
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The results indicate no significant
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Important: 4.1.2 Conclusion If you
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However, the combined impact of oth
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Frees up space below the bar for ot
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from the hiperpools, they were not
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So, we advise you to not overalloca
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See 4.3, “Monitoring DBM1 storage
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Table 4-4 System storage configurat
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Stack 11356 21033 85% 8648 19799 12
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KB 600 500 400 300 200 100 0 Figure
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For the same buffer pool size and o
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4.2.3 Conclusion Nondistributed per
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Important: With PTFs UK04394 (DB2 V
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- DATASPACE BP CONTROL BLOCKS = 0 M
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The EXTENDED REGION SIZE (MAX) is t
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RDS OP POOL (MB) N/A RID POOL (MB)
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As you can now appreciate, it is im
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Megabytes A V7 Customer DBM1 Thread
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4.5.1 Performance The most buffer p
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4.6.1 Performance maintained in a 2
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4.6.2 Conclusion We can conclude th
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service for Unicode conversions, an
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overcome this, when DB2 Connect is
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INSERT HV1 1200 HV2 1200 SELECT HV1
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AIX C-program Conversion Routines P
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4.7.1 Performance The improvements
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In October 2003, a new enhancement
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UseServerEncoding data source prope
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4.8.1 Performance 4.8.2 Conclusion
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Multilevel security with row-level
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► The security level that defines
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DB2 must call RACF for this dominan
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4.9.2 Conclusion The CPU increase c
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4.10.1 Performance VSAM does not kn
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4.10.2 Conclusion 4.10.3 Striping A
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5 4 3 2 1 0 9109TLLB 4 Parallel DB2
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--------------------------- -------
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This message is completed with the
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This enhancement is introduced by P
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This record is activated by: -START
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an online transaction with very sim
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5.1 System level point-in-time reco
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BACKUP SYSTEM During backup DB2 rec
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Figure 5-1 FRBACKUP PREPARE elapsed
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Figure 5-4 BACKUP SYSTEM FULL measu
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5.1.2 Conclusion The BACKUP SYSTEM
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Figure 5-7 shows the sliding scale
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Maybe you have implemented a space
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For dynamically prepared queries, D
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► CHAR(8) to VARCHAR(8) ► CHAR(
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Before ALTER INDEX add column, a ta
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30 25 20 15 10 Figure 5-12 FETCH CP
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Percent of index pages Avg. Index L
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300 250 200 time in seconds 150 100
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REORG REBALANCE We executed and mea
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5.4 Volatile table 5.4.1 Conclusion
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If explicit clustering for a table
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Load table of 20M rows, 10 partitio
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Times in seconds 20 18 16 14 12 10
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RUNSTATS INDEX PARTITION of a DPSI
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Note that when the qualified partit
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► “NO” - Values in such colum
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5.6.10 Support for more than 245 se
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6.1 Online CHECK INDEX Online CHECK
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SORTOUT DD UNIT=SYSDA,SPACE=(CYL,(5
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- SORT 6 indexes in parallel - CHEC
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make DB2 take the maximum paralleli
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6.3 LOAD and UNLOAD delimited input
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6.3.2 Conclusion We measured the CP
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Options for cardinality and distrib
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► Number of column groups: 1 ►
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cases is the total time of RUNSTATS
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6.4.5 Conclusion Statistics Advisor
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goals for end-user services. We sho
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alanced across all members. With th
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method. Prior to DB2 V8 those array
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when compared to DB2 V7. At the ser
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7.2.2 Performance - Distributed cli
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Recommendation If you currently do
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► The DB2 Universal JDBC type 4 D
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WebSphere z/OS - DB2 z/OS V8 - Serv
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DB2 Universal Type 4 Driver - JDBC
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Use DB2 Connect when a high amount
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JCC Type 4 Direct 4:3 Concentration
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The SYSIBM.INDOUBT table and the pa
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Batch updates A batched update is a
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Example In DB2 V8 SQL/XML publishin
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INSERT INTO PUB_TAB(DOC) SELECT XML
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7.5.3 Conclusion The new XML publis
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A second role of the managed server
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7.6.3 Performance The following inf
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Impact on coupling facility: You do
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Table 8-1 shows extracts from DB2 P
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and secondary GBP structures have t
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DB2 member already has the table sp
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8.2.1 Performance We ran a number o
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esolve any contention. This extra a
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There is also no need to use RELEAS
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Table 8-12 DB2 I/O CI Limit Removal
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8.5 Miscellaneous items In this sec
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DB2 V8 improves Restart Light. If i
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9.1 Unicode catalog DB2 for z/OS su
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that all applications are converted
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- CLASST: Specifies the threshold a
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From these measurements we observe
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Class 1 CPU time (MSEC) 200 150 100
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dynamic statement cache. If activat
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that everything is ready. This step
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Table Number of rows SYSDATABASE 75
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In Figure 9-7 we describe the perfo
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Old - Query 5 New - Query 5 CPU (se
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Query 35 36 Old DSNTESQ CPU 1 hr 1
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10.1 DB2 Estimator DB2 Estimator V8
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- REAL AND AUXILIARY STORAGE This i
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Another use is during back out of a
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In DB2, the IBM Data Encryption too
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The utilities ran on a G7 Turbo wit
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time Figure 10-1 DB2 HPU vs. UNLOAD
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DSNTIAUL with multi-row fetch The r
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A.1 Maintenance for DB2 V8 The APAR
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APAR # Area Text PTF and Notes PQ88
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APAR # Area Text PTF and Notes PQ96
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APAR # Area Text PTF and Notes PK21
Page 418 and 419: APAR # Area Text PTF and Notes PK46
Page 420 and 421: APAR # Area Text PTF and Notes PQ85
Page 422 and 423: APAR # Area Text PTF and Notes PK09
Page 424 and 425: 392 DB2 UDB for z/OS Version 8 Perf
Page 426 and 427: B.1 DB2 PE Storage Statistics trace
Page 428 and 429: Storage heading Description 24 BIT
Page 432 and 433: C.1 DB2 SQL PA additional reports N
Page 434 and 435: |is the last matching predicate. Ap
Page 436 and 437: |ANL6052I *** NOTE: | |This index i
Page 438 and 439: PREDICATE ANALYSIS ----------------
Page 440 and 441: D.1 DB2 EXPLAIN EXPLAIN describes t
Page 442 and 443: Table D-2 PLAN_TABLE contents and b
Page 444 and 445: Column Type Content SORTC_ORDER BY
Page 446 and 447: Column Type Content OPTHINT CHAR(8)
Page 448 and 449: D.1.3 DSN_FUNCTION_TABLE You can us
Page 450 and 451: Example: D-1 Creating DSN_STATEMENT
Page 452 and 453: Column Type Content BIND_QUALIFIER
Page 456 and 457: ICF integrated catalog facility ICF
Page 458 and 459: ► DB2 UDB for z/OS V8: Through th
Page 462 and 463: character set 174 CHECK DATA 262 CH
Page 464 and 465: Equi-join predicates 54, 402 Equiva
Page 466 and 467: MINSTOR 145-146 Mismatched data typ
Page 470 and 471: Sort tree nodes 144 SORTDATA 268 SO
Page 472 and 473: 306 Universal Driver for SQLJ and J
Page 476: DB2 UDB for z/OS Version 8 Performa
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