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

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APAR # Area Text PTF and Notes PK21861 Virtual storage DBM1 PK21892 Virtual storage DBM1 PK22442 Virtual storage DDF PK22611 Locking and prefetch PK22814 Sort Merge Join Dynamic Statement Caching and bind option KEEPDYNAMIC(YES). New online ZPARM CACHEDYN_FREELOCAL indicates that a cleanup will be in effect. More instrumentation fields in the IFCID 225 for more information on the cache Reduce storage use for accumulation of cached stack entries of allied agents (like ND type CICS threads) DDF storage shortage while processing long threads with KEEPDYNAMIC=YES and hundreds of output columns causing large SQLDA For data sharing users excessive drain locks acquired. For both data sharing and non-data sharing users excessive sequential prefetches scheduled 384 DB2 UDB for z/OS Version 8 Performance Topics UK15493 UK14540 UK14634 UK14326 Cost estimation with correlated subqueries UK13671 PK22887 LOBs Improve insert or update performance for LOB data UK15037 also in V7 PK22910 LOBs LOAD and UNLOAD with file reference variables UK13721 also V7 PK23743 Virtual storage DDF DB2 storage management will monitor xxxxDIST address space storage usage. When the storage cushion for the address space is breached, DB2 will begin contraction of storage pools UK17364 PK23495 Views Push down predicates with outer join UK14370 PK23523 UNION ALL Runtime structure memory consumption UK18547 PK24556 PK24585 DSNAIMS DSNA317I DSNAIMS ERROR IN OTMA_OPENX.A PK24558 DISPLAY Poor performance for -DISPLAY DATABASE SPACENAM LOCKS command PK24710 Incorrect data UK15449 UK15285, see also PK24819 (UK15224) for IMS UK15650 also V7 Incorrect output with IN list query UK15150 PK25241 LOBs Insert/update performance UK18503 PK25326 Real storage Contract PLOCK engines storage after use UK15958 PK25427 Real storage Better real frame accounting with MVS OA15666 UK12253 PK25742 Utilities REORG TABLESPACE SHRLEVEL CHANGE improved building the mapping table index for BUILD or SORTBLD phases PK26199 DISPLAY performance Performance improvement for -DISPLAY DATABASE SPACENAM RESTRICT or ADVISORY command UK15904 PK21371 (PK13555)
APAR # Area Text PTF and Notes PK26692 PREPARE Short PREPARE CPU time degradation UK18020 PK26879 Latches High LC32 contention with a large number of package search lists (collid*) UK16191 PK27281 SQL Non correlated EXISTS subquery UK17220 PK27287 LOAD New LOAD keyword, IDENTITYOVERRIDE, which enables LOAD REPLACE to reload unloaded identity column that was created as GENERATED ALWAYS back into the same table PK27578 Parallel queries UK17369 Queries are OK for zIIP redirect UK16616 PK27712 Utilities LOAD, REORG, and REBUILD now show correct t accounting for zIIP PK28561 Packages IFCID239 will no longer collect package detail information by default UK17089 UK18090 PK28637 Packages Change improves all packages and triggers UK18201 PK29626 Buffer pool management Real storage management and hash chain UK17312 PK29791 Data sharing Option to LIGHT mode to allow the user the default V7 behavior which ignores the INDOUBT URs and terminates after freeing retained locks. PK29826 RECOVER It allows RECOVER PARALLEL utility to run when cataloged image copy data set is moved by external means from one kind of tape device to another PK30087 REBUILD INDEX REBUILD INDEX of a single NPI over a partitioned table space may experience degradation in the BUILD phase with zIIP PK30160 INSERT Free space is not reused correctly during space search for non-segmented table spaces PK34251 TEMPLATE Three new TEMPLATE utility keywords, SUBSYS, LRECL, and RECFM, to allow dynamic allocation of a DDNAME to use MVS BATCHPIPES SUBSYSTEM UK19282 UK19777 UK19776 for V7 UK18276 UK17805 UK25290 UK25291 for V9 PK34441 REORG Improve availability of concurrent SQL UK21950 PK35390 REORG REORG SHRLEVEL REFERENCE or CHANGE: reduce elapsed time during the SWITCH phase. PK36717 INSERT Insert performance suffers with segmented table spaces PK37354 IFC IFCID 225 to collect buffer manager storage blocks below the bar PK38201 INSERT Storage leak with PK32606 (PE) causes long insert time UK22021 UK22020 for V7 UK21175 UK25044 more functions in V9 UK23728 UK23727 for V7 PK40057 Prepare Avoid column level authorization checking UK24197 Appendix A. Summary of performance maintenance 385
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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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esolve any contention. This extra a
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There is also no need to use RELEAS
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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
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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
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 412 and 413: APAR # Area Text PTF and Notes PQ88
Page 418 and 419: APAR # Area Text PTF and Notes PK46
Page 422 and 423: APAR # Area Text PTF and Notes PK09
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
Page 462 and 463: character set 174 CHECK DATA 262 CH
Page 464 and 465: 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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