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

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3-48 Consistency query - 31 New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 3-49 Starting to analyze a sample query . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 3-50 Suggested RUNSTATS statements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 3-51 Reason for RUNSTATS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 3-52 Saved queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 3-53 New suggested RUNSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 3-54 Statistical output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 3-55 Recollection of inconsistent statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 3-56 Conflicting statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 3-57 Statistics Advisor Plug-integrated with Visual Explain . . . . . . . . . . . . . . . . . . . . . . . 122 3-58 Predefined default values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 3-59 Conflict statistics threshold setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 3-60 Explain without using an MQT table by Visual Explain . . . . . . . . . . . . . . . . . . . . . . 124 3-61 Explain using an MQT table by Visual Explain . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 4-1 CPU workload summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 4-2 V7 vs. V8 Utility CPU measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 4-3 DBM1 virtual storage constraint relief (no data spaces nor hiper pools) . . . . . . . . . 140 4-4 DBM1 below 2 GB virtual storage comparison for different workloads . . . . . . . . . . 149 4-5 DBM1 user thread storage comparison DB2 V7 vs. V8. . . . . . . . . . . . . . . . . . . . . . 152 4-6 Real storage comparison DB2 V7 vs. V8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 4-7 MVS storage overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 4-8 Sample RMF Monitor III STORF Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 4-9 DBM1 storage by time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 4-10 Thread-related storage by time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 4-11 Storage per thread by time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 4-12 CCSID conversion - Local application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 4-13 CCSID conversion - Remote application - 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 4-14 CCSID conversion - Remote application - 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 4-15 CCSID conversion - Local z/OS Universal Java Type 2 Driver . . . . . . . . . . . . . . . . 180 4-16 CCSID conversion - Remote Prepare using Java Universal Type 4 Driver. . . . . . . 181 4-17 CCSID conversion - Remote Prepare of SQL statement. . . . . . . . . . . . . . . . . . . . . 182 4-18 CCSID conversion - Local Prepare using Universal Java Type 2 Driver . . . . . . . . . 182 4-19 Conversion performance overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 4-20 Larger CI size impact on DB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 4-21 IBM System z9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 4-22 Table space scan with MIDAWs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 5-1 FRBACKUP PREPARE elapsed time vs. #volumes in the copy pool . . . . . . . . . . . 222 5-2 FRBACKUP PREPARE elapsed time vs.#versions for 67 volume copy pool . . . . . 222 5-3 BACKUP SYSTEM DATA ONLY measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 5-4 BACKUP SYSTEM FULL measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 5-5 RESTORE SYSTEM measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 5-6 Sliding scale for 64 GB data sets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227 5-7 Sliding scale for 16 GB data set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 5-8 CPU time before ALTER, after ALTER and after REORG. . . . . . . . . . . . . . . . . . . . 234 5-9 INSERT CPU time before ALTER, after ALTER and after REORG . . . . . . . . . . . . 235 5-10 SELECT elapsed and CPU time before and after ALTER INDEX add column . . . . 236 5-11 FETCH CPU time - Alter index padded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 5-12 FETCH CPU time - Alter index not padded and rebind . . . . . . . . . . . . . . . . . . . . . . 238 5-13 Query CPU overhead using NOT PADDED vs. PADDED index . . . . . . . . . . . . . . . 239 5-14 Average index leaf pages and index getpages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 5-15 NOT PADDED index impact on utilities - Index VARCHAR(14) . . . . . . . . . . . . . . . 241 5-16 NOT PADDED index impact on utilities - Index VARCHAR(1) . . . . . . . . . . . . . . . . 241 5-17 NOT PADDED index impact on utilities - Index 4 columns VARCHAR(1). . . . . . . . 242 xii DB2 UDB for z/OS Version 8 Performance Topics
5-18 Rotate partition - Elapsed time comparison. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243 5-19 Partition distribution before and after REORG REBALANCE . . . . . . . . . . . . . . . . . 244 5-20 REORG REBALANCE elapsed time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245 5-21 Load with 1 NPI vs. 1 DPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 5-22 Load with 5 NPIs vs. 5 DPSIs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 5-23 REORG with 1 NPI vs. 1 DPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 5-24 REORG with 5 NPIs vs. 5 DPSIs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 5-25 Rebuild index partition of PI, NPI and DPSI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 5-26 Rebuild index PI, NPI, and DPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 5-27 Check index PI, NPI and DPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 5-28 Runstats index PI, NPI and DPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 6-1 CHECK INDEX SHRLEVEL REFERENCE and SHRLEVEL CHANGE . . . . . . . . . 262 6-2 SHRLEVEL CHANGE vs. SHRLEVEL REFERENCE with FlashCopy . . . . . . . . . . 266 6-3 SHRLEVEL CHANGE vs. SHRLEVEL REFERENCE w/o FlashCopy . . . . . . . . . . 267 6-4 LOAD with default SORTKEYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 6-5 Distribution statistics performance comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 7-1 Multi-row FETCH distributed DB2 V7 vs. DB2 V8 . . . . . . . . . . . . . . . . . . . . . . . . . . 286 7-2 Multi-row FETCH - Distributed host to host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287 7-3 Multi-row INSERT - Distributed host to host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289 7-4 Multi-row fetch - DB2 client to host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290 7-5 Multi-row insert - DB2 client to host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291 7-6 DB2 Universal Type 2 Driver vs. legacy JDBC 2.0 Driver . . . . . . . . . . . . . . . . . . . . 294 7-7 DB2 Universal Type 2 Driver - Gateway DB2 vs. DB2 Universal Type 4 Driver . . . 295 7-8 DB2 Universal Type 2 Driver vs. DB2 Universal Type 4 Driver . . . . . . . . . . . . . . . . 296 7-9 JDK improvements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297 7-10 JDBC .app/DB2 Connect vs. JCC Type 4 - CMP workload. . . . . . . . . . . . . . . . . . . 297 7-11 DB2 Universal Type 4 Driver - JDBC vs. SQLJ - CMP workload. . . . . . . . . . . . . . . 298 7-12 DB2 Universal Type 4 Driver - JDBC vs. SQLJ - Servlet workload . . . . . . . . . . . . . 298 7-13 JCC Type 4 vs. JCC Type 4 with DB2 Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . 299 7-14 JCC T4 configuration for balancing options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 7-15 JCC T2 and DB2 Connect configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 7-16 Performance of JCC T4 vs. DB2 Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302 7-17 Servlet workload - Type 2 non-XA vs. Type 2 XA compliant driver . . . . . . . . . . . . . 303 7-18 DB2 Universal Driver - KEEPDYNAMIC YES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305 7-19 XML extender decomposition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308 7-20 XML extender vs. SQL publishing functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311 7-21 Composition by XML publishing functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311 7-22 EWLM support with WAS/AIX and DB2 for z/OS V8 . . . . . . . . . . . . . . . . . . . . . . . . 313 7-23 Enterprise Workload Manager Control Center - Managed servers . . . . . . . . . . . . . 314 7-24 Enterprise Workload Manager Control Center - Server topology . . . . . . . . . . . . . . 315 7-25 EWLM control center - Service class statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 7-26 EWLM implementation cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 9-1 Unicode conversion example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343 9-2 Multi-row fetch support of DSNTEP4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347 9-3 Multi-row fetch support of DSNTEP4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348 9-4 Multi-row fetch support of DSNTIAUL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349 9-5 Multi-row support of DSNTIAUL comparing V7 with V8. . . . . . . . . . . . . . . . . . . . . . 350 9-6 Migration times to CM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357 9-7 Migration from CM to NFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358 9-8 Catalog consistency queries - Measurement results . . . . . . . . . . . . . . . . . . . . . . . . 361 9-9 Catalog consistency queries - Measurement results . . . . . . . . . . . . . . . . . . . . . . . . 362 10-1 DB2 HPU vs. UNLOAD utility Case 1 through Case 5. . . . . . . . . . . . . . . . . . . . . . . 374 10-2 DB2 HPU vs. UNLOAD utility Case 6 through Parallel . . . . . . . . . . . . . . . . . . . . . . 374 Figures xiii
Page 1: ibm.com/redbooks Front cover DB2 UD
Page 4 and 5: Note: Before using this information
Page 6 and 7: 2.5.3 Increased number of deferred
Page 8 and 9: 4.5.2 Conclusion . . . . . . . . .
Page 10 and 11: 7.4.1 ODBC Unicode support . . . .
Page 12 and 13: x DB2 UDB for z/OS Version 8 Perfor
Page 16 and 17: xiv DB2 UDB for z/OS Version 8 Perf
Page 18 and 19: 8-5 CF Request Batching - DB2 CPU .
Page 20 and 21: xviii DB2 UDB for z/OS Version 8 Pe
Page 22 and 23: Trademarks The following terms are
Page 24 and 25: Added information The following APA
Page 26 and 27: ► Added reference to June 15, 200
Page 28 and 29: Michael Parbs is a DB2 Specialist w
Page 30 and 31: Hugh Smith Jim Teng John Tobler Yoi
Page 32 and 33: xxx DB2 UDB for z/OS Version 8 Perf
Page 34 and 35: 1.1 Overview 1.1.1 Architecture IBM
Page 36 and 37: - Column data type changes can be d
Page 38 and 39: 1.1.3 Data warehouse 1.1.4 Performa
Page 40 and 41: Volatile (or cluster) tables, used
Page 42 and 43: In this chapter we anticipate the a
Page 44 and 45: 2.1.3 I/O time 2.1.4 Virtual storag
Page 46 and 47: ► The performance benchmarks for
Page 48 and 49: application that can have great pot
Page 50 and 51: Because you can significantly incre
Page 52 and 53: The possible increase in thread foo
Page 54 and 55: 2.5.9 Unicode parser Important: Con
Page 56 and 57: You can keep the DBRMs in EBCDIC fo
Page 58 and 59: Macro Parameter Old value New value
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Page 62 and 63: ► 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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B.1 DB2 PE Storage Statistics trace
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Storage heading Description 24 BIT
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C.1 DB2 SQL PA additional reports N
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|is the last matching predicate. Ap
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|ANL6052I *** NOTE: | |This index i
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PREDICATE ANALYSIS ----------------
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D.1 DB2 EXPLAIN EXPLAIN describes t
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Table D-2 PLAN_TABLE contents and b
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Column Type Content SORTC_ORDER BY
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Column Type Content OPTHINT CHAR(8)
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D.1.3 DSN_FUNCTION_TABLE You can us
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Example: D-1 Creating DSN_STATEMENT
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Column Type Content BIND_QUALIFIER
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ICF integrated catalog facility ICF
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► DB2 UDB for z/OS V8: Through th
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character set 174 CHECK DATA 262 CH
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Equi-join predicates 54, 402 Equiva
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MINSTOR 145-146 Mismatched data typ
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PQ84160 378, 387 PQ85764 387 PQ8584
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Sort tree nodes 144 SORTDATA 268 SO
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306 Universal Driver for SQLJ and J
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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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