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

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428 DB2 UDB for z/OS Version 8 Performance Topics
Index Numerics 00D70027 229 16 exabytes 3, 142 -20248 417 4096 partitions 144 64-bit Addressability 13, 142, 144, 157 Virtual storage xxv, 2, 18, 127 65041 open data sets 5, 128, 213 767 5 -952 307 A AA12005 313 Accounting enhancements 208 ACCUMACC 26, 365 Additional high water mark counters 205 Advisory reorg pending 230 Agent level workfile tracing 211 ALTER BUFFERPOOL 25, 169, 339, 345 ALTER GROUPBUFFERPOOL 25, 345 ALTER INDEX NOT PADDED 242 PADDED 242 ALTER TABLE ADD MATERIALIZED QUERY 41 ROTATE PARTITION FIRST TO LAST 233 ALTER TABLE ADD PARTITION 233 Application Program Interface 31 application requestor 287 application server 285 Architecture xxv, 2, 9, 12–13, 16, 130, 281, 284–285 AREO* 230, 235 Array fetch 285, 292 Array input 285 AS 40, 84 AS SECURITY LABEL 193 ASENSITIVE 94–96, 99, 103 Assign 147, 194, 258 ATOMIC 53, 87 Audit record 212 AUTHCACH 26 Automatic LPL recovery 257, 337 Automatic query rewrite 39–41, 43, 46–47, 52 automatic space management 5, 229 Automatic summary tables 39 Availability enhancements Other 217 AVG 109 B BACKUP 4, 6, 26, 217, 219, 221–223, 243, 261 BACKUP SYSTEM 217–218, 220, 223–226 DATA ONLY 223–224 FULL 223 Backward index scan 7, 107 Batched index page splits 320 BLKSIZE 25 BOTH 274 BOTH, 74 BPSIZE 142 BSDS 6, 219–220, 358 Buffer pool Control blocks 17, 19, 141–142, 159, 162, 164, 394 Buffer pools 141–142 BUILD2 4, 248, 255 Elimination of 248 Built-in functions 188–189 DECRYPT_BIN 188 DECRYPT_CHAR 188 ENCRYPT 188–189 ENCRYPT_TDES 188 GETHINT 188 Built-in security labels 193 Business Information Warehouse 6 Byte addressable 142 C CACHE 25–26, 29, 53, 59, 65, 129, 143, 147, 153, 158, 165, 198, 201, 336, 351, 366, 394–395 Cached statement ID 210–211 CACHEDYN 25 CARDF 276 CARDINALITY 7, 30, 41, 73–74, 83, 85–86, 114–115, 124, 273, 275, 277, 402, 405 CARDINALITY MULTIPLIER 83 Cardinality values 74, 273 CASTOUT 3, 12, 18, 20, 25, 142, 153, 158–160, 322–323, 333, 337, 339, 346, 394–396 Castout owner 323 CASTOUT processing 22, 138, 319, 321, 323, 334–335 CATEGORY 114, 117, 192, 194, 310, 415 CATMAINT 351, 356–357 CATMAINT UPDATE 351, 356 CCSID 174–177, 179–181, 183–184, 304, 343 1200 177 1208 177, 179 UNICODE 175, 342 CCSID set 414 CF 324, 336, 339, 388 CF level 12 22, 319, 321 CF lock propagation reduction 8 CF request batching 22, 26, 132, 135, 138, 319, 321–325 Change Log Inventory utility 283–284 changeable parameters 256 Changing partition boundaries 230 character conversion 342 © Copyright IBM Corp. 2005. All rights reserved. 429
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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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Table 8-12 DB2 I/O CI Limit Removal
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8.5 Miscellaneous items In this sec
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DB2 V8 improves Restart Light. If i
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9.1 Unicode catalog DB2 for z/OS su
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that all applications are converted
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- CLASST: Specifies the threshold a
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From these measurements we observe
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Class 1 CPU time (MSEC) 200 150 100
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dynamic statement cache. If activat
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that everything is ready. This step
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Table Number of rows SYSDATABASE 75
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In Figure 9-7 we describe the perfo
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Old - Query 5 New - Query 5 CPU (se
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Query 35 36 Old DSNTESQ CPU 1 hr 1
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10.1 DB2 Estimator DB2 Estimator V8
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- REAL AND AUXILIARY STORAGE This i
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Another use is during back out of a
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In DB2, the IBM Data Encryption too
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The utilities ran on a G7 Turbo wit
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time Figure 10-1 DB2 HPU vs. UNLOAD
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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 416 and 417: APAR # Area Text PTF and Notes PK21
Page 424 and 425: 392 DB2 UDB for z/OS Version 8 Perf
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
Page 466 and 467: MINSTOR 145-146 Mismatched data typ
Page 468 and 469: PQ84160 378, 387 PQ85764 387 PQ8584
Page 470 and 471: Sort tree nodes 144 SORTDATA 268 SO
Page 472 and 473: 306 Universal Driver for SQLJ and J
Page 476: DB2 UDB for z/OS Version 8 Performa
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