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

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7.5.3 Conclusion The new XML publishing functions outperform significantly the corresponding UDFs from the XML extender. 7.5.4 Recommendation For the purpose of composing XML documents from DB2 data the use of the XML publishing function is preferred over the corresponding DB2 XML extender UDFs. They are generally more efficient, flexible and versatile than the DB2 XML Extender publishing functions. 7.6 Enterprise Workload Manager 7.6.1 Introduction Look at Enterprise Workload Manager (EWLM) as z/OS WLM applied to a heterogeneous environment. EWLM introduces the goal-oriented z/OS WLM philosophy to all platforms. See the book IBM Enterprise Workload Manager, SG24-6350, for a detailed description of EWLM. Enterprise Workload Manager enables you to automatically monitor and manage multi-tiered, distributed, heterogeneous or homogeneous workloads across an IT infrastructure to better achieve defined business goals for end-user services. These capabilities allow you to identify work requests based on service class definitions, track performance of those requests across server and subsystem boundaries, and manage the underlying physical and network resources to set specified performance goals for each service class. By bringing this self-tuning technology to the set of servers, routers, and other devices enabled with Java virtual machine support, Enterprise Workload Manager can help enable greater levels of performance management for distributed systems. In the first release, the Enterprise Workload Manager provides goal-based end to end performance monitoring of an application and influences network traffic routing decisions by network load balancers for improved application performance and server effectiveness. A systems administrator will be able to monitor multiple servers, answering such questions as: ► How well is the work progressing? ► Are the business commitments for end-user service being met? ► If the performance goals are not being met, which components of which servers are causing the problem? ► Which type of user is being affected by the problem? And performing such tasks as: ► Easily identifying where time is being spent in a distributed application that spans different operating systems, applications, networks and routers. ► Specifying a performance goal that applies to each class of user of a distributed application. ► Identifying which servers are actively supporting a given application and what applications are running on a given server. 312 DB2 UDB for z/OS Version 8 Performance Topics
7.6.2 Description EWLM is an implementation of policy-based performance management. EWLM Correlator Support is for server side only and it is only for TCP/IP. It is implemented with PTF UK03835 for APAR PQ91509 for DB2 V8, and it allows you to do performance measurement using ARM instrumentation. PTF UK03058 for APAR PQ99707 is also recommended for performance improvement for JCC clients. PTF UA15189 for APARs OA07196 and PTF UA15456 for APAR OA07356 implement this function from the z/OS side. APAR OA12005 (currently open) for z/OS 1.6 and z/OS 1.7 is also recommended for performance improvements. The scope of management is a set of servers that you logically group into what is called an EWLM management domain. The set of servers included in the management domain have some type of relationship; for example, z/OS server with DB2 V8, AIX server with WAS. See Figure 7-22. EWLM Support in WebSphere/DB2 for z/OS V8 GUI User signon via WEB Browser Management Server Host EWLM Domain Manager Domain Policy and Topology EWLM Control Center style sheets Websphere Express as servlet engine Windows XP IRWW w orkload client driver AIX EWLM Agent for AIX EWLM Platform interfaces Server Operating System Application Instrumentation Interfaces WAS JCC Driver Figure 7-22 EWLM support with WAS/AIX and DB2 for z/OS V8 EWLM Domain There is a management focal point for each EWLM management domain, called the EWLM domain manager. The domain manager coordinates policy actions across the servers, tracks the state of those servers, and accumulates performance statistics on behalf of the domain. On each server (operating system) instance in the management domain there is a thin layer of EWLM logic installed called the EWLM managed server. The managed server layer understands each of the supported operating systems, gathering resource usage and delay statistics known to the operating system. z/OS EWLM Managed Server for z/OS FMID HVE1110 Control Blocks JNI Layer EWLM Platform interfaces Application Instrumentation Interfaces ARM (Enclaves) DB2 Server Operating System ARM (C, Java) Chapter 7. Networking and e-business 313
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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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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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Page 324 and 325: Recommendation If you currently do
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Page 352 and 353: Impact on coupling facility: You do
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Page 374 and 375: 9.1 Unicode catalog DB2 for z/OS su
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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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