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

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APAR # Area Text PTF and Notes PQ88375 RUNSTATS Correction on COLGROUP CARDINALITY for partitioned table spaces PQ88582 ODBC DB2 V8 ODBC now supports SQL statements up to 2 MB in size (was 32765) when connected to z DB2 servers running in NFM. PQ88665 Space allocation The secondary space allocation quantity in extending DB2 data set may be smaller than the one specified by the user or calculated by the sliding scale. This happens in z/OS 1.5 where extent consolidation is in effect. PQ88784 Substrings The new and changed functions allow you to specify the code unit in which the strings should be processed. The code unit determines the length in which the operation is to occur. PQ88896 Archive logs Improved performance when sequentially reading DFSMS compressed archive logs. PQ89070 Locks LOCK AVOIDANCE extended to singleton SELECT with ISO(CS) and CD(YES) PQ89181 Locks CPU reduction, benefitting multi-row by eliminating redundant lock/unlock requests PQ89191 Load Load zero rows into a DEFINE NO TABLESPACE sets the non partitioning index to RBDP, not leaving it in RW PQ89297 FLA FLA performance enhancement with priority of Log Apply phase in RECOVER and RESTORE utility inherits that of the utility batch job instead of preempted SRB priority PQ89919 Data sharing ECSA storage is not being released by DB2 when it is obtained while running a REORG utility. Also to exclude deferred write from 180 CI limit removal. PQ90022 (and PQ93821) Visual Explain DSN8EXP stored procedure for usage by Visual Explain so the user is authorized to Explain without being authorized to the data PQ90075 LOBs To reduce 15 second timer interval to milliseconds in order to avoid intermittent 15 second wait in commit when another agent is also updating GBP-dependent LOG YES LOB written at commit 380 DB2 UDB for z/OS Version 8 Performance Topics UQ88754 UQ91257 UQ89517 UQ94797 UQ90143 UQ91470 UQ90464 UQ91700 also in V7 UQ92067 (and in V7 for Recover) UQ89194 also in V7 UQ92323 also in V7 UQ89852 also in V7 PQ90147 RACF Support for 1012 secondary IDs UQ92698 PQ90263 X Loader Improvements for LOBs support by XLoader UK03227 Also in V7 PQ90547 IFCID Loss of accounting fields UQ95032 PQ90884 RUNSTATS DSTATS on non-indexed columns to achieve equivalent performance with V7 tool UQ93177 PQ91009 DDF Location name is mandatory in BSDS UQ90701
APAR # Area Text PTF and Notes PQ91101 IFC For V7 and V8, this APAR adds fields to IFCID 225 to record real storage statistics information. In addition, for V8 only, this APAR adds fields to IFCID 225 to record some statistics information for use with dynamic statement caching. UQ92441 also in V7 PQ91493 Locks CPU reduction, benefitting multi-row UQ91466 PQ91509 EWLM Preliminary DDF EWLM support UK03835 PQ91898 Locks CPU reduction, benefitting multi-row UQ92546 PQ92072 Multi-row ODBC array input support of multi-row Insert UK06883 PQ92227 DPSI It improves performance in some cases where a data-partitioned secondary index is being used to access a table. It may do this by either: 1. Reducing the overhead involved with DPSI 2. Avoiding the DPSI PQ92749 Check Index Online Check Index support (availability improvement) PQ93156 Restore System FLA for Restore System utility, 4x faster with 100 MB PQ93620 Multi-row Multi-row Delete shows high CPU when number of rows in a Fetch/Delete call is high PQ93821 Visual Explain UQ93972 UK04683 UQ93079 UQ96567 EXPLAIN sample stored procedure DSN8EXP UQ90022 PQ94147 Prepare High CPU consumption for dynamic prepare occurs when FREQVAL COUNT in SYSCOLDIST is greater than 100 UK00296 also V7 PQ94303 MLS Correction UQ96157 PQ94872 IFC It adds fields to IFCID 225 to record some statistics information for use with dynamic statement caching. PQ94822 Encryption Exploitation of the clear key DES instructions on the CPACF and ICSF CLE, coreq is OA08172 PQ94923 IFC It adds fields to IFCID 225 to record some statistics information for use with dynamic statement caching. PQ95164 Restore System PQ95881 Application connectivity PQ96189 Max open data sets Corrections on RBLP, LPL, and FLA default changed to 500 MB (5x faster). UQ93207 UK00049 UQ93207 UQ95553 JCC T4 z/OS XA Connectivity (Version 2.3) UQ96302 DB2 fails data set open if 65041 reached in z/OS1.6. UQ96862 Appendix A. Summary of performance maintenance 381
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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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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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8.2.1 Performance We ran a number o
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Page 364 and 365: There is also no need to use RELEAS
Page 366 and 367: Table 8-12 DB2 I/O CI Limit Removal
Page 368 and 369: 8.5 Miscellaneous items In this sec
Page 370 and 371: DB2 V8 improves Restart Light. If i
Page 372 and 373: 340 DB2 UDB for z/OS Version 8 Perf
Page 374 and 375: 9.1 Unicode catalog DB2 for z/OS su
Page 376 and 377: that all applications are converted
Page 378 and 379: - CLASST: Specifies the threshold a
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
Page 392 and 393: Old - Query 5 New - Query 5 CPU (se
Page 394 and 395: Query 35 36 Old DSNTESQ CPU 1 hr 1
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
Page 402 and 403: In DB2, the IBM Data Encryption too
Page 404 and 405: The utilities ran on a G7 Turbo wit
Page 406 and 407: time Figure 10-1 DB2 HPU vs. UNLOAD
Page 408 and 409: DSNTIAUL with multi-row fetch The r
Page 410 and 411: A.1 Maintenance for DB2 V8 The APAR
Page 414 and 415: APAR # Area Text PTF and Notes PQ96
Page 416 and 417: APAR # Area Text PTF and Notes PK21
Page 420 and 421: APAR # Area Text PTF and Notes PQ85
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
Page 458 and 459: ► 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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