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

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Table Number of rows SYSDATABASE 750 SYSPLSYSTEM 14 SYSDBAUTH 756 SYSDBRM 6519 IPNAMES 0 SYSPLAN 5515 LOCATIONS 0 SYSPLANAUTH 6969 LULIST 0 SYSPLANDEP 43949 CATMAINT performance measurements show very similar CPU and elapsed times between data sharing and non-data sharing environments. This is true when migrating from V5 to V6, V6 to V7, V5 to V7 and V7 to V8 CM. DB2 V8 catalog The information related to the performance migration to the DB2 V8 catalog is listed in Table 9-4, We show the performance of the utility Catmaint, and also job DSNTIJNE, Reorg of the catalog. We also describe how much larger they can grow. The statistics refer to three different case studies from customer scenarios. Table 9-4 CATMAINT statistics in non-data sharing V 7 to V 8 CM CATMAINT UPDATE V8 CM to V8 NFM DSNTIJNE DB2 Catalog Increase V8 NFM compared with V7 Company 1 (28.3 GB) The migration from V8 CM to V8 NFM does not use CATMAINT. When you migrate V7 to V8 CM, the size of the catalog does not change. Dominant element in the catalog size Just to illustrate the size considerations with one example, we refer to a real life customer scenario of a bank with a production data sharing group holding 19 members. Their DB2 V7 catalog size is 3 MB and the directory is 7.3 MB. In this case the directory is 142% bigger than the catalog with the largest VSAM file from the directory being SPT01 with 3 MB (the same size of the catalog) because of the huge number of packages. This is a good case for 356 DB2 UDB for z/OS Version 8 Performance Topics Table Number of rows Table Company 2 (15.2 GB) Company 3 (698 MB) 255 sec. 67 sec. 6 sec. CPU 692 sec. 255 sec. 27 sec. 55 min. 5 sec. 20 min. 53 sec. 2 min. 6 sec. CPU 2 hrs 17 min. 40 sec 1 hr 28 min. 48 sec 8 min. 3 sec. Number of rows Elapsed time Elapsed time 0.46% 1.03% 8% Increase in table size 2.29% 8.21% 9% Increase in index size Note: The size of the catalog does not increase when you migrate from V7 to V8 CM. The size of the catalog just increases marginally when you are migrating from V8 CM to V8 NFM.
spring cleaning of the directory: Before migrating it would be very appropriate to free all the packages that are not being used, reduce SPT01, and migrate faster. SPT01 is used to store skeleton package tables (SKPTs). These tables store the access paths to DB2 data. When a package is executed, DB2 uses this information to access the data it needs. Because a single SKPT can be longer than the maximum record length that can be used in DB2, SKPTs are stored as a sequence of SKPT sections. The skeleton package table parent record (SPTR) contains as much of the SKPT section as the record can fit. The entire SKPT section is stored in this record if it fits; if it does not fit, it is stored in one or more SPTRs. Each SPTR is identified by a unique section and sequence number. How long will it take to migrate? Based on the measurements, you can estimate the migration time first to CM, and then to NFM. When migrating to V8 CM, if your catalog is less than 30 GB, your performance can be predicted using Figure 9-6. Assuming that the catalog has no major anomalies, the most important structure to influence the duration of CATMAINT is SYSDBASE, because CATMAINT does a scan on that structure. The elapsed time migrating to V8 is certainly longer than it was when migrating to V7 because DB2 has to prepare the data for later conversion to Unicode at ENFM time. This is the step that involves a scan of SYSDBASE. DB2 is not updating every page, as was done in the past, but it still scans the SYSDBASE. Estimation based on this graph is only valid for a particular CPU and DASD model upon which this measurement was done. Seconds 800 700 600 500 400 300 200 100 0 Figure 9-6 Migration times to CM DB2 Catalog Migration V7 - V8 CM 0 5 10 15 Gigabytes 20 25 30 CPU time Elapsed time Note: The measurements in data sharing showed no difference with non-data sharing and in the case of migrating from V7 to V8 CM, data sharing was a little bit better in CPU. Chapter 9. Installation and migration 357
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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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Page 340 and 341: Example In DB2 V8 SQL/XML publishin
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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 410 and 411: A.1 Maintenance for DB2 V8 The APAR
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
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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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