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

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In DB2, the IBM Data Encryption tool implements encryption through the standard EDITPROC exit. Data Encryption for IMS and DB2 Databases V1.1 supports and exploits DB2 V8. For performance data see 4.7.1, “Performance” on page 184. For more information about this DB2 tool, see http://www.ibm.com/software/data/db2imstools/ 10.9 DB2 Data Archive Expert One of the pressing concerns for Information Technology is the increasing volumes of data; databases are growing at an exponential rate and many organizations are alarmed at the volume of data they need to keep on hand. Inactive data exists everywhere; data warehouses grow every day. Inactive data is not unusable; it just has a lower probability of access. Organizations may have governmental requirements to keep certain data and there may be be a valid business need. As databases grow in size, the percentage of inactive data also grows. Inactive data costs are high and many organizations are examining ways to archive dormant data to keep operational costs down. The Data Archive Expert tool can help you manage your archived data so that it can be quickly accessed whenever necessary. For more information about this DB2 tool, see http://www.ibm.com/software/data/db2imstools/ The DB2 Data Archive Expert for z/OS V1.1 supports and exploits DB2 V8. 10.10 DB2 Bind Manager It might be important to know if you perform a rebind: Will the access path change? Does a plan or package need a rebind? Can we bypass a rebind because the application logic changed but not the SQL? Often, with a new release of DB2, there are changes in the access path, but it would be advantageous to know ahead of time the effect of a rebind on the access path selection by DB2. The bind process uses CPU resources and DB2 must quiesce access to the plan or package. If the bind is unnecessary, you can save much in resource consumption by avoiding a bind. As the name implies, the DB2 Bind Manager tool manages binds in the DB2 environment and can help with all of the issues mentioned above. For more information about this DB2 tool, see http://www.ibm.com/software/data/db2imstools/ The DB2 Bind Manager Tool V2.2 supports and exploits DB2 V8. 10.11 DB2 High Performance Unload The DB2 High Performance Unload (HPU) is a tool that allows you to unload data from your DB2 tables outside of DB2. The UNLOAD utility is provided with the DB2 Utilities Suite V7 370 DB2 UDB for z/OS Version 8 Performance Topics
and DB2 V8. These two products provide different unload capabilities. The major functional differences between them are outlined in Table 10-2 below. For more information about this DB2 tool, see the following Web site: http://www.ibm.com/software/data/db2imstools/ Table 10-2 DB2 HPU vs. UNLOAD utility DB2 High Performance Unload tool UNLOAD utility Supports DB2 V5, V6, V7 and V8 Supports DB2 V and V8 Supports any SQL statement by passing any statements it cannot process to DB2 Table 10-3 describes the different output formats available with the DB2 High Performance Unload tool. Table 10-3 HPU output formats 10.11.1 Performance measurements Supports a limited number of statements Has 4 output formats DB2 V7: only one output format - LOAD. DB2 V8: supports delimited format in addition to LOAD above. Has a user exit that allows you to examine the row prior to writing to the output data set. You can also modify the row prior to writing it to the data set. Can unload data from a dropped table. HPU requires that the dropped table be recreated in the catalog and then perform the unload from an image copy using the OBID of the original table. HPU UNLOAD command syntax same between z/OS product and MP product. HPU V2 supports BMC and CA UNLOAD product syntax. HPU output formats Description Several performance measurements were made to compare the performance of different unload options. One set of tests compares the HPU V2.2 and the DB2 V8 UNLOAD utility. Another set of tests illustrate the difference between unloading data using the DB2 V8 UNLOAD utility with a load output format as opposed to using the delimited data format. The results are discussed in this section. N/A If the created table has the same OBID as the original table, the UNLOAD utility does the unload. If the OBID is different, then the UNLOAD utility will not work. REORG UNLOAD Same format as the IBM REORG UNLOAD utility N/A N/A DSNTIAUL Output identical to DSNTIAUL format DELIMITED You can specify a separator and a delimiter character VARIABLE Treat all variable length fields as variable USER Completely user-defined; can customize every column differently Chapter 10. Performance tools 371
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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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Page 352 and 353: Impact on coupling facility: You do
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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
Page 390 and 391: In Figure 9-7 we describe the perfo
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Page 398 and 399: - REAL AND AUXILIARY STORAGE This i
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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
Page 432 and 433: C.1 DB2 SQL PA additional reports N
Page 434 and 435: |is the last matching predicate. Ap
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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
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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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DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

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