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

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306 Universal Driver for SQLJ and JDBC 3, 281, 285, 293–294 UNLOAD 133, 371–372 DELIMITED 271–272, 371 Delimited output 376 UNLOAD DELIMITED 270–272 UPDATE NONE 7 UQ57177 212 UQ57178 212, 386 UQ61237 67 UQ61327 386 UQ67433 386 UQ72083 386 UQ74866 338, 386–387 UQ75848 387 UQ77215 387 UQ77421 387 UQ79020 387 UQ79775 386 UQ81754 387 UQ83466 387 UQ84631 387 UQ85042 362 UQ85043 362, 387 UQ85607 285 UQ86458 388 UQ86831 379 UQ86868 388 UQ86872 379 UQ87013 378 UQ87049 305, 379 UQ87093 387 UQ87321 388 UQ87443 378 UQ87591 379 UQ87633 305, 379 UQ87760 379 UQ87903 379 UQ886790 388 UQ88680 379 UQ88734 388 UQ88754 275, 380 UQ88970 388 UQ88971 305, 379 UQ89026 388 UQ89190 389 UQ89194 380 UQ89372 379, 417 UQ89517 229, 380 UQ89850 389 UQ89852 380 UQ90022 381 UQ90143 368, 380 UQ90158 387 UQ90159 378 UQ90464 39, 380–381, 389 UQ90653 388 UQ90654 379 UQ90701 353, 380 440 DB2 UDB for z/OS Version 8 Performance Topics UQ90726 365 UQ90755 210 UQ90756 210, 379 UQ90793 387 UQ90794 378 UQ91022 379 UQ91099 275, 379 UQ91257 307, 380 UQ91416 280, 387 UQ91422 280, 378 UQ91466 381 UQ91470 380 UQ91968 380, 388 UQ92066 388 UQ92067 380 UQ92322 259, 389 UQ92323 380 UQ92475 379, 388 UQ92546 39, 381 UQ92692 39, 379 UQ92698 260, 380 UQ93079 381 UQ93177 275, 380 UQ93207 365 UQ93407 389 UQ93893 389 UQ93972 254, 381 UQ94429 285 UQ94430 285 UQ94797 380 UQ95032 380 UQ95553 381 UQ95694 365 UQ96157 381 UQ96302 381 UQ96531 382 UQ96567 39, 381 UQ96862 213, 381 URL 304, 363, 371 URL syntax 293 USER 371 User-defined functions 89, 307 User-defined objects 199 USING VCAT 199 UTF-16 175, 177, 179–180, 182, 185–187, 343–344 UTF-8 22, 175, 179, 181–182, 184–187, 343–344 Utility RESTART 21, 220, 262, 367 SORTDATA 268 SORTKEYS 268 V VALUES 6–7, 24–25, 32, 42, 44, 68, 73–74, 93, 172, 195, 198, 217, 220, 226, 228–229, 233, 257, 273–275, 304, 308, 322, 345, 352, 405–406, 410, 412, 414–416 VARCHAR NOT PADDED 11, 14, 232, 237, 345, 401 VARGRAPHIC 68–69, 183, 231 VARIABLE 371 Variable pools 141
VDWQT 25, 345 VE 117, 124 VERSION 412 Versioning 369 Virtual storage constraint 9, 12, 17, 19, 127, 129, 139–140, 145, 156, 213 Visual Explain 72–73, 77, 110, 112, 114–115, 123–125, 259 Access plan 111 Maintain 111 Tune SQL 111, 123 VOLATILE 8 Volatile table 217, 246 volatile tables 7, 246, 369 Volume-level backups 218 VPSIZE 142 VSAM Striping 201–202 VSAM CI size 199–201 W WARM 321–322 WebSphere 26, 172, 174, 281–282, 294, 297–299, 304, 316 WebSphere Application Server 295, 303, 314 WLM 26, 117, 209, 308, 312, 350 WLM enclave 209 WLM priority 258 workfile 30, 56, 58–59, 65, 70, 77, 84, 86, 90, 115, 211, 255, 268 Write And Register Multiple 321 WRITE CLAIM 264, 337 Write down 191, 194 write-down 194, 197–198 Write-down control 196 Write-down privilege 196–197 X XA 303 XES 319, 325–327, 329, 331 XES contention 173, 325, 328–330, 332 XML 111, 281, 307–309 Built-in functions 281, 308 XML composition 311 XML data type 308–309 XML documents 307, 311–312 XML extender 281, 307–309, 311–312 XML file 111 XML publishing functions 281, 307–309, 311–312 XML2CLOB 309–310 XMLAGG 309–310 XMLATTRIBUTES 309–310 XMLCONCAT 309–310 XMLELEMENT 309–310 XMLFOREST 309–310 XMLNAMESPACES 309 Z z/Architecture 13, 139, 153, 157, 171 z/OS APARs 390 z800 27 z900 27, 129, 188, 284 z990 26–27, 129, 185, 187–188, 190, 308 zSeries xxv, 2, 9, 13, 27, 97, 174, 178, 180, 183–186, 189, 213, 221, 233, 248, 309, 342, 344 Index 441
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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 PK21
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APAR # Area Text PTF and Notes PK46
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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 468 and 469: PQ84160 378, 387 PQ85764 387 PQ8584
Page 470 and 471: Sort tree nodes 144 SORTDATA 268 SO
Page 476: DB2 UDB for z/OS Version 8 Performa
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DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

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