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

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character set 174 CHECK DATA 262 CHECK INDEX 5, 133, 240, 242, 249, 253, 262–267 CHECK INDEX SHRLEVEL(REFERENCE) PART 265 Child L-lock propagation 331 CHKFR 26 CI size 6, 199, 202 CICS 130, 160 CISIZE 199 CLASSPATH 293–294 CLASST 25, 346 clear key 189 CLOB 307, 309 CLOSE NO 320 close processing for pseudo close 320 CLUSTER 4, 8, 115, 199, 401, 403 cluster table 246 Cluster tables 8 Clustering 400, 403 Clustering index 3–4, 247 Secondary index 247 Clusters 8 CMTSTAT 26 Code page 22, 174, 177 COLGROUP 73–74, 274, 276 Collating sequence 68, 247 Column type change 4 COMMENT 205, 347 Common table expression and recursive SQL 6 Common table expressions 259 Recursive SQL 6 Communications database 283 Compatibility mode 8, 13, 133–136, 286, 343, 354 compatibility mode functions available 18 Compression dictionaries 141 Compression dictionary 6, 144, 158, 160, 394, 396 Concurrent copy 6, 200, 263, 266 CONDBAT 25, 206 CONNECT 182, 206, 283, 285, 351 connection concentration 299 CONTOKEN 401 Control Center 314 CONTSTOR 145–146 Conversion Remote applications 176 Coprocessor 188, 190 COPY 112, 133, 142, 200, 202, 218, 220, 226, 263, 266, 359, 364, 371 Copy pool 218–222, 225 COPYPOOL 219, 223–224 COUNT 30, 40–41, 46–47, 50–51, 69, 72–73, 108–109, 158, 164, 189, 206, 254–255, 274, 276, 279, 360, 395, 400 Coupling Facility 257, 319–325, 327–332, 336, 339 CPACF 188 Create index dynamic statement invalidation 5 CSA 158, 162, 172, 396 CSV 270 CT 143 430 DB2 UDB for z/OS Version 8 Performance Topics CTHREAD 25, 162, 205–206 CURRENT MAINT TYPES 42, 352 CURRENT MAINTAINED TABLE TYPES FOR OPTIMI- ZATION 124, 352 CURRENT REFRESH AGE 42, 44, 124, 352 CURRENT SQLID 212, 259, 408 CYCLE 223, 226, 354 D Data caching 6, 65 Data Encryption for IMS and DB2 Databases 369 Data Encryption Tool 189 DATA INITIALLY DEFERRED 40–41 Data Manager 158, 394–395 data set extend 226 data sharing 319 Data sharing locking 319, 325–326, 328, 335 Data source property 179, 188 data space 141–143, 148, 158–159, 164, 394 Data space buffer pool 141, 159 Database name 283 Data-partitioned secondary index 4, 248, 274 Data-partitioned secondary indexes 4 DATE 53, 122, 158, 175, 206, 272, 395 DB2 Administration Tools 230 DB2 Archive Log Accelerator 367 DB2 authorization 260 DB2 Bind Manager 370 DB2 catalog changes 11, 23, 344 DB2 CLI 285 DB2 Connect 177–179, 187, 281, 284–285, 290, 297, 299 DB2 Connect and DRDA 3 DB2 Connect Personal Edition 112 DB2 Data Archive Expert 370 DB2 Estimator 364 DB2 High Performance Unload 370 DB2 performance consulting offering 167 DB2 Query Monitor 368 DB2 restart light 337 DB2 SQL Performance Analyzer for z/OS 369 DB2 tools 363 DB2 Universal driver 292, 294–295, 303–304, 306 DB2 Universal Driver for SQLJ and JDBC 281, 285, 293–294 DB2 Utilities Suite 370 DB2 V8 APARs 378, 386 Dbalias 283 DBCS 174, 180, 186, 342, 414 DBD 20, 23, 25, 135, 142, 158, 243, 351, 396 DBD01 220 DBM1 STORAGE STATISTICS 163 DBM1 Storage Statistics 158 DBM1 virtual storage constraint 129 DBRM 23, 113, 206, 361 DDF 8, 21, 25–26, 94, 208–209, 281, 283–285, 295, 338, 351–352 Declared temporary table 91, 408, 410 Delayed index availability 231 DELIMITED 371
UNLOAD 371 DES 188–189 DFSMS 201, 217–218, 221, 226, 229 DFSMShsm 4, 27, 218–220, 224 DFSORT 26, 263, 274 DIS GROUP 354 DISABLE QUERY OPTIMIZATiON 40, 53 Disaster recovery 4, 221 Disjoint 194 DIST address space 152, 176–177, 290–291 Distribution statistics 7, 72, 76, 273–278, 280 DNAME 403 Dominance 193–194, 196 Dominate 194–195, 197 Double Byte Character Set 174, 342, 414 DPSI 92, 247–256 BUILD2 250–251 CHECK INDEX 252 Data sharing 255 LOAD 248 DRAIN ALL 264, 337 DRDA 3, 15, 18, 21–22, 130, 132, 136, 177, 179, 181, 206, 208, 280–281, 284–290, 293, 295–296, 303, 354 DSC 7, 152 DSC statement ID in Explain 7 DSMAX 26, 162, 213, 338 DSN6ARV 25 DSN6FAC 25–26 DSN6SPRM 25–26 DSN6SYSP 25–26, 352 DSN8EXP 259 DSNAIMS 384 DSNB250E 337 DSNB406I 169 DSNB508I 153 DSNB536I 153, 157 DSNB543I 169 DSNB610I 153, 157 DSNDB06.SYSDDF 345 DSNDB06.SYSSTR 345 DSNHDECP 175, 350–351, 353 DSNHMCID 350 DSNI031I 207 DSNJ031I 258 DSNJU003 220 DSNR031I 207, 256 DSNR035I 258 DSNTEJ3M 123 DSNTEJXP 259 DSNTEP2 346 DSNTEP4 29, 136, 346–347 MULT_FETCH 347 DSNTESQ 359, 362 DSNTIAUL 136, 189, 346, 348–350, 371, 374–375 DSNTIJNE 353, 356, 358–359 DSNTIJNF 353 DSNTIJNH 353, 358 DSNTIJTC 351 DSNTIP5 25 DSNTIP6 42 DSNTIP7 25, 351 DSNTIP8 352 DSNTIPC 25, 351 DSNTIPE 25, 351 DSNTIPF 351 DSNTIPN 26, 351 DSNTIPP 26, 351 DSNTIPR 26, 351 DSNU1129I 245 DSNUTILB 263 DSNUTILS 111, 117 DSNUTILS stored procedure 111 DSNWZP 111 DSNX@XAC 195 DSNZPARM 9, 14, 17, 20, 42, 64–65, 111, 128, 136, 138, 143–144, 147, 160, 173, 199, 205, 207, 209, 213, 220, 225–227, 232, 246, 256–257, 332, 395 CACHEDYN 20, 143 CMTSTAT 209 NPGTHRSH 246 UIFCIDS 205 DSNZPARM default values 24–25 DSSIZE 4, 229 DSTATS 275–278, 280 DSVCI 199 DTT 91, 93 DTYPE 404 DWQT 25, 345 Dynamic allocations 213 Dynamic scrollable cursor Example 107 Dynamic scrollable cursors 91, 94–95, 97, 107 Considerations 95 Locking 94 UPDATE 94 Dynamic statement cache 3, 5, 7, 12, 20, 143, 146, 148, 152, 160, 211, 236, 304, 352, 394–396 DYNAMICRULES 259 E ECSA 21, 127, 162, 172–174, 396 EDITPROC 189 EDM pool 3, 16, 20, 25, 139, 141–143, 148–149, 153, 158–159, 162, 209, 331, 352, 366, 394, 396 EDMDBDC 25, 143 EDMDSPAC 143 EDMPOOL 25, 143, 160, 351 EDMSTMTC 25, 143 ENABLE QUERY OPTIMIZATION 40 Enabling-new-function mode 8 ENCODING 174, 205, 342, 351 Encoding scheme 11, 174, 176, 304, 342, 344, 353, 414–415 encryption 188 Encryption functions 188 encryption keys 190 ENDING AT 233 ENFM 8, 13–14, 24, 135, 345, 353, 357 ENFORCED 21, 41, 194, 268, 343 Enterprise Workload Manager 312 Index 431
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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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Page 416 and 417: APAR # Area Text PTF and Notes PK21
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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 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 472 and 473: 306 Universal Driver for SQLJ and J
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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