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

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► The DB2 Universal JDBC type 4 Driver provides better performance than the current JDBC type 3 Driver. Note that the type 3 JDBC Driver or “net” driver is deprecated. ► The balancing features of the DB2 Universal Driver offer good performance and a good choice of functions. Starting with V5.0.2 WebSphere is supporting the new DB2 Universal Driver. WebSphere V5.0.2 z/OS - DB2 for z/OS V8 - Servlet workload Different test cases were measured and are presented in this section. DB2 universal type 2 Driver vs. legacy JDBC 2.0 Driver - local environment WAS V5.0.2 and DB2 V8 are running in the same LPAR. The throughput of this configuration with the Type 2 legacy Driver is compared to the configuration with the new Type 2 Driver, see Figure 7-6. WebSphere z/OS - DB2 z/OS V8 - Servlet workload Legacy JDBC 2.0 driver vs. JCC type 2 WebSphere V502 servlet WebSphere V502 servlet z/OS 1.4 legacy JDBC type 2 JCC T2 1.8.36 DB2 V8 for z/OS DB2 V8 for z/OS Figure 7-6 DB2 Universal Type 2 Driver vs. legacy JDBC 2.0 Driver An increase of 2% throughput is noticed with the DB2 Universal Type 2 Driver. There is no reason to stop you from using the new JCC Type 2 Driver. If you still have the legacy Drivers in your CLASSPATH, you must make sure that the db2jcc.jar file is in the CLASSPATH, ahead of the legacy Driver files, because some classes have the same name in the legacy and the DB2 Universal Driver for SQLJ and JDBC. However, to avoid confusion it is probably best to only have one set of drivers (old or new) in the CLASSPATH. DB2 universal type 2 Driver - Gateway DB2 vs. DB2 universal type 4 Driver Although it seems unusual to establish a connection to a remote DB2 for z/OS with a fully implemented DB2 subsystem, it was your only choice in the past since there was no DB2 client on the z/OS platform available. Besides the license cost for the DB2 software, the DB2 subsystem used also memory and CPU resources on the WAS LPAR. 294 DB2 UDB for z/OS Version 8 Performance Topics Trans/sec - higher is better 350 300 250 200 150 100 50 0 2 % Legacy Driver JCC
With the z/OS Application Connectivity to DB2 for z/OS feature that provides DB2 universal Driver type 4 connectivity, the use of a gateway DB2 is avoided and a 73% increase in throughput on the WAS LPAR is realized, see Figure 7-7. WebSphere V502 servlet WebSphere V502 servlet WebSphere z/OS - DB2 z/OS V8 - Servlet workload JCC type 2/Gateway DB2 vs. JCC type 4 z/OS 1.3 z/OS 1.3 JCC T2 1.8.36 JCC T4 1.8.36 DB2 V8 for z/OS D D F D DB2 V8 D for z/OS F z/OS 1.3 z/OS 1.3 D D F DB2 V8 for z/OS Figure 7-7 DB2 Universal Type 2 Driver - Gateway DB2 vs. DB2 Universal Type 4 Driver DB2 Universal Type 2 Driver vs. DB2 Universal Type 4 Driver - Local environment In Figure 7-8 we compare the JCC Type 2 and Type 4 Driver in a local environment. The intention is to demonstrate the difference in performance between the Type 2 and Type 4 Driver in a local environment in the same LPAR as DB2. Since the WebSphere Application Server is local to the DBMS (same LPAR), the Type 2 Driver can do “native” calls to DB2; this configuration normally provides the best performance. Your Java application that is running under the control of WAS can talk to DB2 through the Type 2 JDBC Driver, and a local RRS attachment. Using the Type 4 Driver in this configuration is not a recommended setup for a production environment, since all SQL requests go through DRDA over TCP/IP (so through the TCP/IP stack) into DB2’s DDF address space. Even though DRDA is a very efficient database communication protocol, it is normally more expensive than going through the local RRS attachment as will become clear from this test case. Trans/sec - higher is better 500 400 300 200 100 73 % 14 % 0 WebSphere LPAR Remote DB2 JCC type2/DB2 JCC type 4 Chapter 7. Networking and e-business 295
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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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Page 304 and 305: 6.3.2 Conclusion We measured the CP
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Page 312 and 313: 6.4.5 Conclusion Statistics Advisor
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Page 324 and 325: Recommendation If you currently do
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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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