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

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JCC Type 4 Direct 4:3 Concentration JCC Type 4 Direct no Concentration DB2 Connect 4:3 Concentration DB2 Connect no Concentration Figure 7-16 Performance of JCC T4 vs. DB2 Connect We can observe that the DB2 Connection concentration degradation is 13.5%, versus the JCC Type 4 concentration degradation of 12%. The value is very similar. In determining the choice of function to implement concentration and balancing, keep in mind that the two options have different characteristics and the requirements of the application must take into account the considerations summarized in Figure 7-4 Table 7-4 Comparing the key points of the two solutions DB2 Connect JCC Driver Wider scope DB2 connect is a gateway. It is aware of all DB2 requests. it is capable of supporting connection concentration across multiple JVMs on one or more machines. JCC driver only runs within the scope of a single JVM, it is not aware of the connections of another JVM and it can only concentrate connections originated from its own JVM Connection pooling Connection pooling allows agents and connections to be reused by other users and programs. JCC T4, at the time writing, doesn't have connection pooling, and it must either rely on external application server such as WebSphere or extra programming in standalone Java applications to support connection pooling. Ease of software upgrade From a software management perspective, it is easier to have the software in one place, any upgrades only have to be done to the DB2 Connect Enterprise Edition (EE) server (a centralized gatekeeper for DB2 servers on z/OS), not to every JCC driver spread throughout the entire enterprise. 302 DB2 UDB for z/OS Version 8 Performance Topics JCC T4 vs. DB2 Connect 369.34 428.84 422.23 0 100 200 300 400 500 487.03 Normalized z/OS Transaction / Second Better granularity DB2 Connect can only specify the maximum number of coordinator agents allowed at the server level. it cannot control connection agents allocated to each JVM. JCC driver allows users to specify the maximum number of allowed transport objects at datasource level and at the driver level. This gives JCC driver much better granularity to manage transport resources. Better Performance The performance measurements show that JCC T4 has slightly better performance than DB2 Connect V8 when running with the same connection to transport/agent ratio
7.3.2 DB2 Universal Driver X/Open XA support One of the key reasons for using the Universal Driver in a type 2 architecture is for local application performance and for distributed transaction support (XA). XA support was first provided in the DB2 Universal Type 2 Driver and became available in the Type 4 Driver with DB2 V8.1 for Multiplatforms FP4. MQSeries® classes for Java Message Service include the JMS XA interface. These allow MQ JMS to participate in a two-phase commit that is coordinated by a transaction manager that complies with the Java Transaction API (JTA). Description If the application will be involved in a distributed transaction, the COM.ibm.db2.jdbc.DB2XADataSource class should be used when defining DB2 data sources within the WebSphere Application Server. Performance The internal throughput was measured for a servlet workload using the Type 2 non-XA versus the Type 2 XA compliant driver. The environment used in this measurement was z/OS V1.3, DB2 for z/OS V8 and WAS V5.0.2. See Figure 7-17. WebSphere z/OS - DB2 for z/OS V8 - Servlet workload ... JCC type 2 - non-XA vs. XA WebSphere V502 servlet z/OS 1.3 JCC T2 1.8.36 DB2 for z/OS V8 Figure 7-17 Servlet workload - Type 2 non-XA vs. Type 2 XA compliant driver 200 150 100 50 0 non-XA driver The results are less than 1% of internal throughput ratio (ITR= Units of Work/Processor Busy) reduction when using the type 2 XA compliant driver. This means that there is practically no extra overhead in choosing the driver with distributed transaction support from WebSphere. DB2 client application programs that run under the DB2 Universal JDBC Driver can use distributed transaction support in DB2 V7 and DB2 V8. DB2 V8 servers include native XA mode support. However, DB2 V7 servers do not have native XA mode support, so the DB2 Universal JDBC Driver emulates the XA mode support using the existing DB2 DRDA two-phase commit protocol. This XA mode emulation uses a DB2 table named SYSIBM.INDOUBT to store information about indoubt transactions. DB2 uses a package named T4XAIndbtPkg to perform SQL operations on SYSIBM.INDOUBT. XA driver Normalized transactions per second Chapter 7. Networking and e-business 303
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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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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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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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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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