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

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A.1 Maintenance for DB2 V8 The APARs applicable to DB2 V8 are listed in Table A-1. They are provided here as the maintenance of interest for performance and availability functions, at the time of writing. Make sure to contact your IBM Service Representative for the most current maintenance at the time of your installation. Effective June 15, 2007, a DB2 for z/OS Version 8 SUP tape is available world-wide for new customer orders. This SUP tape integrates PTFs COR-closed through December 2006, which had also completed a Consolidated Service Test (CST) cycle. It contains CST tested PTFs which were marked "RSU 0703", which means they completed CST testing in March 2007. This SUP build integrates a total of 964 PTFs (the delta since the previous December 2005 SUP) and will certainly help all new DB2 customers during their V8 installation. For additional information on CST and RSU, please see: http://www.ibm.com/servers/eserver/zseries/zos/servicetst/mission.html Table A-1 DB2 V8 performance-related APARs APAR # Area Text PTF and Notes II10817 Storage usage Fix list part 1 II14047 DFSORT Description of DFSORT changes for V8 utilities II4309 Storage usage II13695 Migration/fall back PQ80631 Dependent routines Fix list part 2 Toleration, coexistence and compatibility PTFs between V8 and V7 Support for dependent WLM-managed routines interface. This APAR along with WLM APAR OA04555 5/04 on z/OS1.4 allows DB2 to inform WLM when inserting work that there is an in-use WLM server TCB waiting for this work to complete. This allows WLM to be more responsive in starting server address spaces. PQ82878 Striping Partitioned TS ran out of 123 extents with striped data set with 3 track minimum extent size because primary volume did not have sufficient free space 378 DB2 UDB for z/OS Version 8 Performance Topics UQ90159 also in V7 UQ90794 also in V7 PQ83649 RAS -DIS THD(*) SERVICE(WAIT) UQ87013 also in V7 PQ84160 Xloader Xloader performance 2x improvement, now even with Unload and Load PQ86071 DSMAX Enforce DSMAX limit by failing data set open if DSMAX exceeded and #open data set >32K, to prevent potential storage shortage UQ91422 also in V7 UQ87443
APAR # Area Text PTF and Notes PQ86074 DSC Instead of reserving 2K storage for Current Path Special Register in each statement stored in DSC, allocate just enough UQ86872 PQ86201 DSC Reduce runtime structure in DSC UQ86831 PQ86477 IFC The IFCID flat file for V7 and V8 now contains current information UQ92475 also in V7 PQ86787 Java Abend and storage leak UQ87049 PQ86904 IRLM Service Roll-up UQ87591 PQ87126 DBM1 virtual storage Excessive DBM1 virtual storage use with KEEPDYN Y and input decimal hv PQ87129 Java JCC driver data type switching causes skipping the DDF performance feature UQ88971 also in V7 UQ87633 also in V7 PQ87168 Data Sharing Protocol 2: correct lock processing UQ87760 PQ87381 Insert Insert performance suffers because of exhaustive search for space to extending the page set PQ87390 Access path Bad access path when running a complex query with OPTIMIZE FOR N ROWS PQ87447 Catalog query Query 5 and 18 of the DSNTESQ catalog consistency queries perform slowly PQ87509 RUNSTATS DSTATS correction for COLGROUP FREQUENCY VALUES for aggregated statistics in partitioned table spaces UK06754 also in V7 UQ91022 UQ90654 also in V7 UQ91099 PQ87611 IRLM IRLM 2.2 storage management enhancements UK16124 PQ87756 Data sharing Allow enablement of data sharing protocol 2 UQ87903 PQ87848 IFC IFCID 173 for -905 occurrence UQ90756 also in V7 PQ87917 I/O I/O performance on ESS/2105 devices can be improved by utilizing the "bypass read/write serialization" option. It is already done for writer, this APAR adds support for reader. Support R/W I/O concurrency in same defined domain (but not same track). ESS “bypass define extent serialization” set by DB2 is disabled when XRC/PPRC/FlashCopy in progress. Extent=1 cylinder in V7, bigger in V8. PQ87969 Multi-row Problems while processing a FETCH against a rowset cursor, after a DELETE WHERE CURRENT OF request. The problem only occurred while index RID access path was chosen by the database. PQ88073 DSC A new keyword ALL is added to EXPLAIN STMTCACHE and a new explain table DSN_STATEMENT_CACHE_TABLE is created to hold the output of IFCID 316 and 318. UQ88680 also in V7 UQ92692 UQ89372 Appendix A. Summary of performance maintenance 379
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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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7.6.3 Performance The following inf
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Impact on coupling facility: You do
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Table 8-1 shows extracts from DB2 P
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and secondary GBP structures have t
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DB2 member already has the table sp
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Page 366 and 367: Table 8-12 DB2 I/O CI Limit Removal
Page 368 and 369: 8.5 Miscellaneous items In this sec
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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
Page 382 and 383: Class 1 CPU time (MSEC) 200 150 100
Page 384 and 385: dynamic statement cache. If activat
Page 386 and 387: that everything is ready. This step
Page 388 and 389: Table Number of rows SYSDATABASE 75
Page 390 and 391: In Figure 9-7 we describe the perfo
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Page 396 and 397: 10.1 DB2 Estimator DB2 Estimator V8
Page 398 and 399: - REAL AND AUXILIARY STORAGE This i
Page 400 and 401: Another use is during back out of a
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Page 406 and 407: time Figure 10-1 DB2 HPU vs. UNLOAD
Page 408 and 409: DSNTIAUL with multi-row fetch The r
Page 412 and 413: APAR # Area Text PTF and Notes PQ88
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
Page 432 and 433: C.1 DB2 SQL PA additional reports N
Page 434 and 435: |is the last matching predicate. Ap
Page 436 and 437: |ANL6052I *** NOTE: | |This index i
Page 438 and 439: PREDICATE ANALYSIS ----------------
Page 440 and 441: D.1 DB2 EXPLAIN EXPLAIN describes t
Page 442 and 443: Table D-2 PLAN_TABLE contents and b
Page 444 and 445: Column Type Content SORTC_ORDER BY
Page 446 and 447: Column Type Content OPTHINT CHAR(8)
Page 448 and 449: D.1.3 DSN_FUNCTION_TABLE You can us
Page 450 and 451: Example: D-1 Creating DSN_STATEMENT
Page 452 and 453: Column Type Content BIND_QUALIFIER
Page 456 and 457: ICF integrated catalog facility ICF
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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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