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

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DB2 Universal Type 4 Driver - JDBC vs. SQLJ - CMP workload As shown in Figure 7-11, SQLJ outperforms JDBC with 25% increased throughput on DB2 for z/OS and 11% on WebSphere V5 AIX. Besides the benefits of static SQL, persistence in WebSphere with SQLJ requires fewer API calls compared to JDBC. WebSphere /AIX - DB2 for z/OS V8 - CMP workload JCC FP4 type 4 - JDBC vs. SQLJ AIX WebSphere V5.0.2 CMP JCC T4 FP4 DB2 for z/OS V8 Figure 7-11 DB2 Universal Type 4 Driver - JDBC vs. SQLJ - CMP workload DB2 Universal Type 4 Driver - JDBC vs. SQLJ - Servlet workload Figure 7-12 shows that the best performance is achieved using SQLJ when the SQLJ files are compiled with the option -db2optimize. Figure 7-12 DB2 Universal Type 4 Driver - JDBC vs. SQLJ - Servlet workload 298 DB2 UDB for z/OS Version 8 Performance Topics D D F Trans/second - higher is better 200 150 100 50 0 11 % 25 % ITR AIX ITR z/OS WebSphere /AIX - DB2 for z/OS V8 - Servlet Workload JCC FP7 type 4 - JDBC vs. SQLJ AIX WebSphere V6 beta JCC T4 FP7 DB2 for z/OS V8 D D F Trans/second - higher is better 250 200 150 100 50 0 JDBC SQLJ -2% 5.5% 6% ITR AIX ITR z/OS SQLJ -db2optimize 9% JDBC SQLJ
SQLJ programs need to use explicitly defined connection contexts as always has been recommended. The test cases presented used WebSphere and the universal Type 4 Driver. The difference in performance with using the Type 2 Driver and DB2 Connect instead is negligible as WAS will perform connection pooling with the Type 4 Driver. JCC Type 4 vs. JCC Type 4 with DB2 Connect - IRWW workload Figure 7-13 illustrates the performance results of running IRWW workload using JCC Type 4 connection going from distributed platform to DB2 for z/OS in comparison of using JCC Type 4 to connect to DB2 for z/OS through DB2 Connect in gateway mode. The measurements show a 2.3% [(382.14 – 373.73) / 382.14 * 100%] internal throughput degradation by going through DB2 Connect rather than going directly to DB2 for z/OS. In the DB2 Connect scenario, both JCC driver and DB2 Connect reside on the same machine, and DB2CONNECT_IN_APP_PROCESS is defined as NO in order to have the application connect to the DB2 Connect EE Server and then have the host connection run within an agent. 400 350 300 250 200 150 100 50 JCC Type 4 Direct vs. JCC Type 4 with DB2 Connect 382.14 373.73 JCC Type 4 Direct JCC Type 4 with DB2 Connect Figure 7-13 JCC Type 4 vs. JCC Type 4 with DB2 Connect Normalized z/OS Transaction / Second Conclusion The new DB2 Universal Type 2 Driver performs as well and better than the legacy JDBC App Driver and the Type 4 Driver performs better than the Type 3 Net Driver. Recommendations We recommend the usage of DB2 universal Type 2 Driver in a local DB2 environment. The Type 4 Driver is preferred when accessing a remote DB2 server in a distributed environment. Use the DB2 Universal Type 4 Driver to access a DB2 server directly when connections are already pooled by other application servers, for example, WebSphere. FixPak 10 has been recently made available and it supports connection concentration and sysplex workload balancing. Chapter 7. Networking and e-business 299
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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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Page 324 and 325: Recommendation If you currently do
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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 374 and 375: 9.1 Unicode catalog DB2 for z/OS su
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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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