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

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MINSTOR 145–146 Mismatched data type 67, 77 MLMT 172 MLS 191, 194–195, 198 MODIFY 139, 172, 226, 233, 354, 359, 371 Monitor system checkpoints 212, 256 Monitoring Log offload activity 212 More log data sets xxv, 6 More partitions 4, 256 MOST 74, 274 MQT 39–43, 45, 48, 50–53, 123–124, 408 Considerations 52 Creation 40 CURRENT REFRESH AGE 123 Summary 47 System-maintained 40 User-maintained 40 MSTR 154 MSTR address space 137, 153, 155, 332–333 MSTR SRB 333 Multilevel security 8, 26, 191, 193–194, 197 Requirements 27 Utilities 197 Multilevel security at the object level 192 Multilevel security with row-level granularity 192 Multiple DISTINCT clauses in SQL statements 5 Multiple IN values 7 Multiple physical partitions 247 Multi-row fetch 21, 31–33, 35, 37–38, 103–106, 136, 281, 285, 287–291, 346, 348 Positioned DELETE 33 Positioned UPDATE 33 Rowset 106 multi-row fetch 31 Multi-row FETCH and INSERT 102, 285 Multi-row INSERT 16, 32, 36, 289, 291 ATOMIC 33 GET DIAGNOSTICS 33 multi-row INSERT and FETCH 6 MVS system failure 325, 337 N nested loop join 69, 112 Net driver 293, 299 New Function Mode 289 New table spaces 345 New tables 345 New-function mode 8, 218 NO SCROLL 94 Non-clustering index 247 Non-GBP-dependent 326, 338 Non-partitioned index 247, 255, 265, 267, 275 Non-partitioned indexes 248, 255 NOT CLUSTER 248 NOT EXISTS 113 NOT NULL WITH DEFAULT 409 NOT PADDED 217, 237–239, 242, 358, 400–401, 403–404 NPAGES 246 434 DB2 UDB for z/OS Version 8 Performance Topics NPGTHRSH 246 NPI 137, 243–244, 249–255, 265 NPSI 248 NUMLKTS 174 NUMLKUS 174 O OA04555 390 OA05960 390 OA06729 390 OA07196 xxii, 313, 390 OA07356 xxii, 313, 390 OA08172 190, 390 OA10984 202 OA12005 xxii, 390 OA15666 384, 391 OA17114 391 Object 11, 111, 176, 181, 185, 192, 195, 205, 207, 230, 258, 263, 284, 323, 336, 338 ODBC 15, 154, 281, 285–286, 290–292, 306 Online DSNZPARMs 256 Online partitioning changes 4 Online REORG 5, 133, 248, 255, 258, 264, 359 Online schema evolution 3–4, 217, 230, 261 Open Group’s DRDA 281 optimistic locking 107 optimizer enhancements 18 ORDER BY 23, 82, 86, 99, 410 OS/390 V2R10 190 OW54685 336 P Package level accounting 8, 208 PADDED 137, 183, 217, 232, 237–239, 241–242, 264, 358, 401, 403–404 VARCHAR 11, 137, 232, 237–238, 345, 401, 403–404 page set 323 Page set P-locks 326, 331 Panel DSNTIP4 42, 147 DSNTIP7 199, 352 DSNTIPP 352 Parallel Access Volume 30 Parallel index build 268–269 parallelism 254 Parallelism details 111 Parameter marker 256 Parent lock contention 326 PARTITION 4, 59, 111, 137, 144, 160, 230, 233, 243, 245, 248–253, 255, 257, 262, 264–265, 267–268, 275, 327, 336 PARTITION BY 247 Partition management 233 Partition pruning 247, 255 PARTITIONED 4, 34, 36, 38, 160, 217, 233, 237, 246–248, 254–257, 263, 268, 270, 274, 327, 346, 372 Partitioned index 245, 247, 255, 265, 267, 275 Partitioned secondary indexes 4, 247, 264
Partitioning 4, 217, 233, 247–248, 255–257, 261 Partitioning index 3–4, 217, 246–248, 257 Partitioning indexes 257 Partitioning key update 257 PARTKEYU 257 PC=NO 127, 172–173 PC=YES 136, 172–173 Performance 6 Multi-row operations 37, 289 PERMIT 107, 193 PGFIX 21, 169–171, 339 PGPROT 172 Physical partitions 245, 247, 250–251, 255 Physically partitioned 247–248 PIECESIZE 229 PK00213 382 PK01510 xxii, 382 PK01841 382 PK01855 382 PK01911 382 PK03293 382 PK03469 xxii, 382 PK04076 xxii, 269, 382 PK04107 382 PK05360 xxii, 382 PK0564 230 PK05644 xxii, 382 PK09158 382, 390 PK09268 xxii, 382 PK10021 383 PK10278 383 PK10662 383 PK11355 383 PK12389 xxii, 383 PK13455 383 PK14393 383 PK14477 383, 390 PK15056 383 PK15288 383 PK18059 383 PK18162 383 PK18454 383 PK19191 383 PK19303 383 PK19769 383 PK19920 383 PK20157 383 PK21237 150, 383 PK21268 383 PK21371 384 PK21861 384 PK21892 384 PK22442 384 PK22611 384 PK22814 384 PK22887 384, 390 PK22910 384 PK23495 384 PK23523 384 PK23743 384 PK24556 384 PK24558 384, 390 PK24585 384 PK24710 384 PK24819 384 PK25241 384 PK25326 384 PK25427 384 PK25742 384 PK26199 384 PK26692 385 PK26879 385 PK27281 385 PK27287 385 PK27578 385 PK27712 385 PK28561 385 PK28637 385 PK29626 385 PK29791 385 PK29826 385 PK30087 385 PK30160 385 PK32606 385 PK34251 385 PK34441 385 PK35390 385 PK36717 385 PK37354 385 PK38201 385 PK40057 385 PK41182 382 PK46170 386 PK47840 386, 390 PK49972 386 PLAN_TABLE access via a DB2 alias 259 P-locks 326, 331 PMDB2 166 point-in-time 4, 27, 218–219 PORT 112, 293, 304 POSITION 91, 270, 281 PQ47973 212, 386 PQ49458 386 PQ54042 67, 84, 386 PQ61458 58–59, 65, 386 PQ62695 112, 386 PQ69741 320, 338, 386–387 PQ69983 387 PQ71179 387 PQ71766 387 PQ71775 362, 387 PQ74772 387 PQ75064 387 PQ78515 387 PQ79232 387 PQ80631 378, 387 PQ81904 387 PQ82878 378, 387 PQ83649 378 PQ8416 280 Index 435
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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
Page 416 and 417: APAR # Area Text PTF and Notes PK21
Page 420 and 421: APAR # Area Text PTF and Notes PQ85
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 468 and 469: PQ84160 378, 387 PQ85764 387 PQ8584
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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