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

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WebSphere z/OS - DB2 z/OS V8 - Servlet workload JCC type 2 vs. JCC type 4 in local environment WebSphere V502 servlet WebSphere V502 servlet z/OS 1.3 JCC T2 1.8.36 z/OS 1.3 JCC T4 1.8.36 DB2 V8 for z/OS T C D P/ D I F P DB2 V8 for z/OS Figure 7-8 DB2 Universal Type 2 Driver vs. DB2 Universal Type 4 Driver Using the setup with the DB2 Universal Type 4 Driver (DRDA), the throughput is reduced by 51% when compared to the Type 2 Driver RRSAF connection to DB2. The Type 2 Driver communicates with DB2 via cross-memory calls where the Type 4 Driver uses the TCP/IP stack. The setup with the Type 4 Driver is not that unusual. If access to several DB2 subsystems in the same LPAR is needed, you will need the Type 4 Driver as this is not supported by the Type 2 Driver with an RRSAF connection. This measurement was executed using JDK 1.3.1. The performance of the setup with the Type 4 Driver improves with JDK 1.4.2. JDK 1.4.2 has seen the JIT compiler optimized, and the Java TCP/IP implementation improved. A separate performance comparison is shown in Figure 7-9. Notice that JDK versions go in pairs with WAS versions: ► WAS 5.0.2 and JDK 1.3.1 ► WAS 5.1.0 and JDK 1.4.2 296 DB2 UDB for z/OS Version 8 Performance Topics Trans/sec - higher is better 350 300 250 200 150 100 50 0 ITR -51% JCC type 2 JCC type 4
WebSphere z/OS - DB2 for z/OS V8 - Servlet workload WAS 5.0.2/JDK 131 vs. WAS 5.1.0/JDK 142 Figure 7-9 JDK improvements WebSphere AIX - DB2 for z/OS V8 For this configuration tests were run with the Type 4 Driver as the Type 2 Driver is a local driver. With the Type 2 Driver you need something in the middle and this “thing in the middle” is DB2 Connect. With the Type 4 Driver and WAS, we do not need DB2 Connect with its characteristics of connection pooling and concentrator because WAS provides the same functionality. JDBC .app/DB2 Connect vs. JCC Type 4 - Servlet workload As shown in Figure 7-10, JCC Type 4 outperforms the .app/DB2 Connect with 10% increased throughput on WebSphere V5 AIX. On DB2 for z/OS the improvement is marginal. WebSphere V5 + servlets 16 % increase in normalized throughput caused by JDK 142 improvement Universal Driver Type 4 benefits from JDK 142 TCP/IP optimization z/OS 1.6 WebSphere V5 servlet JCC T4 2.3.66 D DB2 for D z/OS V8 F Figure 7-10 JDBC .app/DB2 Connect vs. JCC Type 4 - CMP workload Trans/sec - higher is better 700 600 500 400 300 200 100 0 ITR 16% WAS V5.0.2/JDK 131 WAS 5.1.0/JDK 142 WebSphere /AIX - DB2 z/OS V7 - Servlet workload JDBC .app/DB2 Connect vs. JCC Type 4 AIX WebSphere V5 + servlets DB2 V8 JDBC .app driver JCC T4 FP2 DB2 V8 Connect FP2 DB2 for OS/390 and z/OS V7 D D F Trans/second - higher is better 300 250 200 150 100 50 0 10% ITR AIX ITR z/OS .app/DB2Connect JCC T4 FP2 Chapter 7. Networking and e-business 297
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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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Page 286 and 287: RUNSTATS INDEX PARTITION of a DPSI
Page 288 and 289: Note that when the qualified partit
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Page 304 and 305: 6.3.2 Conclusion We measured the CP
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Page 308 and 309: ► Number of column groups: 1 ►
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Page 312 and 313: 6.4.5 Conclusion Statistics Advisor
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Page 322 and 323: 7.2.2 Performance - Distributed cli
Page 324 and 325: Recommendation If you currently do
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Page 332 and 333: Use DB2 Connect when a high amount
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Page 336 and 337: The SYSIBM.INDOUBT table and the pa
Page 338 and 339: Batch updates A batched update is a
Page 340 and 341: Example In DB2 V8 SQL/XML publishin
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Page 354 and 355: Table 8-1 shows extracts from DB2 P
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Page 366 and 367: Table 8-12 DB2 I/O CI Limit Removal
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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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