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

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– REAL AND AUXILIARY STORAGE This is the new block containing the real storage statistics counters. – EDM POOL The block has been extended to contain the field QISESTMT with label STATEMENTS IN GLOBAL CACHE. ► Statistics SAVE file The statistics SAVE file layout has been changed. The Statistics SAVE migration and convert programs shipped with the PTF must be used from now on. ► Performance Database The new fields of IFCID 225 are supported in the Statistics General Table of the Performance Database. The member SFPESAMP(DGOSUPDB) contains ALTER statements for migration purposes. The member SFPESAMP(DGOSQGEN) contains a query that calculates the formulas for “average thread footprint” and “max number of possible threads” within the performance database. ► Performance Warehouse The PE Server shipped with the PTF automatically adds the new columns to the Statistics General Table of the Performance Warehouse. ► Documentation The PE books have been republished in December 2004 and contain updates about these changes. 10.3 Tivoli OMEGAMON XE for DB2 on z/OS IBM Tivoli OMEGAMON XE for DB2 on z/OS is the next evolution in OMEGAMON performance and availability solutions designed to help you proactively manage your DB2 mainframe environment and tune for optimal performance. Its Web interface provides a single interface at the big picture and granular levels, including interaction between DB2 and other applications. IBM Tivoli OMEGAMON XE for DB2 on z/OS helps you identify performance spikes and anomalies that might otherwise go unseen, take action in real time and automate repetitive DB2 operations. In addition to offering leading performance and availability management for DB2, Tivoli OMEGAMON XE for DB2 integrates with other Tivoli products. You can use these integrated products to deploy true end-to-end availability management and help prevent threats to system performance before they impact service levels. Tivoli OMEGAMON XE for DB2 helps you monitor and tune how Workload Manager allocates and balances resources to find the source of performance problems quickly and adjust resources accordingly. You can gain visibility into, and control over, enclave usage. And you can analyze transaction rate information to identify overloaded and under performing workloads. Optimize use of the coupling facility in Parallel Sysplex environments. Because Tivoli OMEGAMON XE for DB2 gives you a single point of control over your DB2 parallel data sharing environment, you have the information necessary to detect, isolate and resolve problems. To optimize the performance of the coupling facility in the Parallel Sysplex, you can analyze coupling facility structures, participating member status and contention rates. 366 DB2 UDB for z/OS Version 8 Performance Topics
The ability to integrate information from Tivoli OMEGAMON XE monitors and third-party software into a single view enables you to identify and track problems across all your enterprise platforms. 10.4 Tivoli OMEGAMON XE for DB2 Performance Expert on z/OS As communicated with the statement of direction from December 7 Announcement 204-297 (US), IBM has converged and expanded the capabilities of DB2 Performance Expert for z/OS, V2.1 (5655-J49) and Tivoli OMEGAMON XE for DB2 on z/OS, V3.0 (5608-A67). IBM Tivoli OMEGAMON XE for DB2 Performance Expert on z/OS represents the effort on converging OMEGAMON XE for DB2 and DB2 Performance Expert into one product that retains the best features of each. This new tool gives you a single, comprehensive tool to help assess the efficiency of and optimize performance from your DB2 Universal Database in the z/OS environment. It automates the analysis of your database performance in real time and also adds expert database analysis functions to help you maximize performance and enhance productivity. The main functions of this tool allow you to: ► Monitor, analyze, and tune the performance of IBM DB2 Universal Database and DB2 applications on z/OS ► Improve productivity with meaningful views of performance ► Quickly and easily identify performance bottlenecks using predefined rules of thumb ► Enjoy substantial breadth and depth in monitoring DB2 environments by combining batch-reporting capabilities with real-time monitoring and historical tracking functions ► Support an enterprise-wide integrated systems management strategy activated by the IBM Tivoli OMEGAMON XE family ► Store performance data and analysis tools in a performance warehouse The software combines the sophisticated reporting, monitoring, and buffer pool analysis features of the IBM Tivoli OMEGAMON XE for DB2 Performance Monitor on z/OS and IBM DB2 Buffer Pool Analyzer products. The book A Deep Blue View of DB2 Performance: IBM Tivoli OMEGAMON XE for DB2 Performance Expert on z/OS, SG24-7224 helps you understand ans install the main functions of the product, clarify the differences, and point out the advantages if you had one of the pre-existing products already in use. 10.5 DB2 Archive Log Accelerator If a hardware failure occurs while DB2 is writing changed pages to DASD, or you have applied the wrong updates, you may need to recover the data, and recovery from the logs occurs. If necessary, the DB2 recover utility will mount archive logs to get the needed data in order to restore the corrupted tables. The DB2 archive logs can also be used in other critical recovery situations or an unplanned outage such as a DB2 subsystem restart after a failed DB2 or MVS image. The amount of time spent in such scenarios needs to be minimized to get the application back up as quickly as possible. Chapter 10. Performance tools 367
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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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6.1 Online CHECK INDEX Online CHECK
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SORTOUT DD UNIT=SYSDA,SPACE=(CYL,(5
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- SORT 6 indexes in parallel - CHEC
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make DB2 take the maximum paralleli
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6.3 LOAD and UNLOAD delimited input
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6.3.2 Conclusion We measured the CP
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Options for cardinality and distrib
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► Number of column groups: 1 ►
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cases is the total time of RUNSTATS
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6.4.5 Conclusion Statistics Advisor
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goals for end-user services. We sho
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alanced across all members. With th
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method. Prior to DB2 V8 those array
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when compared to DB2 V7. At the ser
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7.2.2 Performance - Distributed cli
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Recommendation If you currently do
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► The DB2 Universal JDBC type 4 D
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WebSphere z/OS - DB2 z/OS V8 - Serv
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DB2 Universal Type 4 Driver - JDBC
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Use DB2 Connect when a high amount
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JCC Type 4 Direct 4:3 Concentration
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The SYSIBM.INDOUBT table and the pa
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Batch updates A batched update is a
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Example In DB2 V8 SQL/XML publishin
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INSERT INTO PUB_TAB(DOC) SELECT XML
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7.5.3 Conclusion The new XML publis
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A second role of the managed server
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Page 374 and 375: 9.1 Unicode catalog DB2 for z/OS su
Page 376 and 377: that all applications are converted
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Page 380 and 381: From these measurements we observe
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Page 384 and 385: dynamic statement cache. If activat
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Page 388 and 389: Table Number of rows SYSDATABASE 75
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Page 416 and 417: APAR # Area Text PTF and Notes PK21
Page 426 and 427: B.1 DB2 PE Storage Statistics trace
Page 428 and 429: Storage heading Description 24 BIT
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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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