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

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Sort tree nodes 144 SORTDATA 268 SORTDEVT 74, 263, 274 SORTKEYS 261, 268–269 SORTNUM 74, 263, 274 Sparse index for star join 6, 59 Special register 42, 189, 256, 352 Special registers 41–42, 124, 352 SPRMCTH 146 SPRMINT 25 SPRMSTH 146 SPUFI 359, 408 SQL statement 2 MB long 5 SQL statement text 8, 211 SQL statements 2 MB long 5 SQL/XML publishing functions 281, 307 SQLCA 33 SQLCODE 96, 209, 229, 259 SQLDA 343 SQLExtendedFetch 285, 291 SQLJ 150–151, 154, 179, 181, 292, 297–298 Static SQL 181, 297–298, 300 SQLJ applications 293 SQLSTATE 259 SRB time 16 SRTPOOL 144 Stack Storage 141 Stage 1 65–67, 69–71, 115, 195, 304, 400–402, 404, 406 Stage 2 29, 65–67, 69, 115, 400, 403 Star join in memory workfile 56 Star schema 6, 53–55, 65 Data model 53 STARJOIN 54 START DATABASE 257, 336 START WITH 229, 247 Static scrollable cursors 30, 92–93, 95, 97, 100, 107 STMT 158, 161, 361, 395 STMTTOKEN 414 STOGROUP 227 storage per thread 168 Striping 6, 200 Subject 87, 193 SUBSTRING 24 SUM 109 SYSADM 40, 259, 304 SYSALTER 345 SYSCOLDIST 280, 355 SYSCOLDISTSTATS 355 SYSCOLUMNS 355 SYSCOPY 233, 354–355, 359 SYSCTRL 40 SYSHIGH 193 SYSIBM.IPLIST 283, 345 SYSIBM.SQLCAMESSAGE 112 SYSIBM.SYSCOLDIST 279 SYSIBM.SYSCOLUMNS 360 SYSIBM.SYSDUMMY1 345 SYSIBM.SYSOBDS 345 SYSIBM.SYSPACKSTMT 400 438 DB2 UDB for z/OS Version 8 Performance Topics SYSIBM.SYSROUTINES 83 SYSIBM.SYSSTMT 361 SYSIBM.SYSSTRINGS 175, 184–185, 342 SYSIBM.SYSTABLES 72–73, 360 SYSIBM.SYSTABLESPACE 72–73, 360 SYSIN 264, 276, 347 SYSLGRNX 233, 354, 359 SYSLOW 193 SYSMULTI 193 SYSNONE 193 SYSOBDS 345 SYSPACKSTMT 355, 400 SYSPITR CRCR 220 sysplex workload balancing 299 SYSPLOGD 26 SYSPRINT 263, 347 SYSSTMT 355, 361 SYSTABLEPART LOGICAL_PART 233 System checkpoints 212, 256, 258 System level point-in-time recovery 4, 219 System-generated DDNAMEs 213 T Table UDF Block fetch 84 Table UDF cardinality 6, 86 Table-based partitioning 233 Table-controlled partitioning 246–247 Clustering 246–247 TCB time 16, 333 TCP/IP 25, 27, 112, 281, 283, 292, 295 TCPKPALV 25 TEMP database 211 TEXT 8, 38, 69, 72, 84, 175, 183, 187, 211, 259, 271, 342, 360, 378, 386, 390, 406, 417 Text extender 84 Thanks xxvii Thread-related storage 12, 129, 144 thread-related storage 167 TIME 218 TIMESTAMP 41–42, 115, 395, 412–413, 415–416 Tivoli OMEGAMON XE for DB2 on z/OS 366 Transient data type 308 Transition variables 86 translation instructions 180 Trigger WHEN condition 30 Trigger body 87 TROO 186 TROT 186 TRTO 186 TRTT 186 TSQTY 228 Two-phase commit 303 Type 1 292, 353 Type 2 7, 179–182, 285, 292–294, 296, 299, 303, 305, 353 Type 3 292, 294, 299 Type 4 179, 181, 187, 285, 293–294, 296–299
U UA05789 184, 186 UA08703 390 UA11154 390 UA11478 390 UA15188 390 UA15189 313, 390 UA15456 313, 390 UA15677 390 UA22388 390 UA27812 391 UA34634 391 UK00049 381 UK00295 389 UK00296 279, 381 UK00314 382 UK00991 152, 382 UK01174 389 UK01175 382 UK01429 382, 389 UK01467 382 UK01844 382 UK03058 313, 382 UK03176 382 UK03226 389 UK03227 380 UK03490 382 UK03835 313, 381 UK03983 269, 382 UK04036 382 UK04393 382, 389 UK04394 382 UK04683 262, 381 UK04743 382 UK05785 390 UK05786 382 UK06418 382 UK06505 382 UK06754 379, 388 UK06848 39 UK06883 381 UK07167 383 UK07192 383 UK08497 383 UK08561 382 UK08807 230, 382 UK09097 383 UK09343 383 UK10002 383 UK10819 383 UK12124 383 UK12253 383–384 UK12328 383 UK12821 383 UK13636 383 UK13671 384 UK13721 383–384 UK14058 383, 390 UK14283 150, 383 UK14326 384 UK14343 383 UK14370 384 UK14540 384 UK14634 384 UK15036 390 UK15037 384 UK15150 384 UK15285 384 UK15493 384 UK15499 383 UK15650 384, 390 UK15814 383 UK15904 384 UK15958 384 UK16124 379 UK16191 385 UK16616 385 UK17089 385 UK17220 385 UK17312 385 UK17364 384 UK17369 385 UK17805 385 UK18020 385 UK18090 385 UK18201 385 UK18276 385 UK18503 384 UK18547 384 UK19282 385 UK19776 385 UK19777 385 UK20497 382 UK21175 385 UK21950 385 UK22021 385 UK23708 385 UK24197 385 UK25044 385 UK25290 385 UK26761 383 UK27593 386, 390 UK27594 386, 390 UK28485 386 UK9531 382 Unicode xxv, 3, 8, 11, 13, 23, 127, 129, 135, 144, 152, 175–180, 183–187, 205, 261, 304, 306, 342–345, 350–351, 353, 357–358, 369, 414–415 Catalog and directory 11 Collating sequence 23, 183 DBRMs 369 Moving to 184, 351 Precompiler 23 Unicode parser 22 UNION ALL 95, 99 UNIQUE 52, 107, 137, 219, 231–232, 236, 247, 255, 334, 354, 357, 400–401, 403–405 UNIQUE WHERE NOT NULL 231, 248, 405 Universal Client 305 Universal Driver 179, 181, 187, 292, 294–295, 300, 304, Index 439
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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
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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 468 and 469: PQ84160 378, 387 PQ85764 387 PQ8584
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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