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

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1.1 Overview 1.1.1 Architecture IBM DB2 UDB for z/OS Version 8 (DB2 V8 or V8 throughout this publication) includes dozens of changes in SQL, improving DB2 family consistency in many cases, and leading the way in others. Many limits our customers faced are no longer a restriction at all: Using 64-bit virtual memory addressing, providing longer table and column names, allowing 2 MB SQL statements, 4,096 partitions, and three times the log space. Key performance enhancements deliver better family consistency and allow you to execute functions faster. Being able to make database changes without an outage, such as adding a partition, is a breakthrough for availability. Improvements in Java functions, and consistency and integration with WebSphere, make z/OS a better platform for Java. Expansions to security allow for row level granularity, helping with security issues of Web-related applications. Many of these enhancements also strengthen key vendor applications like PeopleSoft®, SAP®, and Siebel®. Major improvements include: ► Virtual storage constraint relief ► Unicode support ► Automated prior point-in-time recovery ► Multi-row fetch, insert ► Multiple DISTINCT clauses ► Lock contention avoidance via volatile tables ► Use of index for backwards searches ► Transparent ROWID ► Create deferred index enhancement ► Longer table names ► Providing DSTATS functionality inside RUNSTATS ► Converting column type ► Altering the CLUSTER option ► Adding columns to an index ► Index-only access path for VARCHAR ► Changing the number of partitions ► Data-partitioned secondary indexes ► Control Center enhancement ► DRDA enhancements In this section we group the enhancements into categories based on the area of impact on your applications. These categories are: ► Architecture ► Usability, availability, and scalability ► Data warehouse ► Performance ► System level point-in-time backup and recovery The most important enhancements to the DB2 architecture are: ► 64-bit virtual storage This enhancement utilizes zSeries 64-bit architecture to support 64-bit virtual storage. The zSeries 64-bit architecture allows DB2 UDB for z/OS to move portions of various storage areas above the 2-GB bar: 2 DB2 UDB for z/OS Version 8 Performance Topics
– Buffer pools and buffer pool control blocks – EDM pool (DBDs and dynamic statement cache) – Sort pool – RID pool – Castout buffers – Compression dictionaries A large address space of up to 264 bytes (16 exabytes) can now be defined for DBM1 and IRLM address spaces. DBM1 replaces hiper spaces and data spaces with buffer pools. As a result, managing virtual storage becomes simpler, and the scalability, availability, and performance improves as your real storage requirements and number of concurrent users increase. IRLM can support large numbers of locks. ► Schema evolution As 24x7 availability becomes more critical for applications, the need grows for allowing changes to database objects while minimizing the impact on availability. Online schema evolution allows for table, index, and table space attribute changes while maximizing application availability. For example, you can change column types and lengths, add columns to an index, add, rotate, or rebalance partitions, and specify which index (the partitioning index or non-partitioning index) you want to use as the clustering index. ► DB2 Universal Driver for SQLJ and JDBC Organizations increasingly require access to data residing in multiple sources in multiple platforms throughout the enterprise. More and more companies are buying applications rather than database management systems, as database selection is being driven by interoperability, price performance, and scalability of the server platform. The Universal Driver for SQLJ and JDBC provides an open and consistent set of database protocols to access data on the Linux®, UNIX®, Windows®, and z/OS platforms. Tools and applications can be developed using a consistent set of interfaces regardless of the platform where the data resides. End users can integrate their desktop tools and other applications in a consistent manner with whichever databases (or multiple databases concurrently) are in the enterprise. The objective of this enhancement is to implement Version 3 of the Open Group DRDA Technical Standard. It eliminates the need for gateways, improves desktop performance, and provides a consistent set of database protocols accessing data from a z/OS server as well as UNIX and Windows servers. ► Unicode support Architectural changes to DB2 V8 enhance the DB2 support for Unicode with SQL in Unicode, Unicode in the DB2 catalog and the ability to join Unicode, ASCII and EBCDIC tables. This means that you can manage data from around the world in the same SQL statement. DB2 now converts any SQL statement to Unicode before parsing, and as a result, all characters parse correctly. ► DB2 Connect and DRDA DB2 Connect and DRDA remain the cornerstone for DB2 distributed processing, and V8 has many enhancements in this area. Enhancements in DB2 V8 remove roadblocks to performance and DB2 family compatibility by providing support for Common Connectivity and standardizing database connection protocols based on the Open Group Technical Standard DRDA Version 3. 1.1.2 Usability, availability, and scalability The main enhancements related to usability, availability, and scalability are: ► Online schema evolution You can change data and indexes with minimal disruption. Chapter 1. DB2 UDB for z/OS Version 8 3
Page 1: ibm.com/redbooks Front cover DB2 UD
Page 4 and 5: Note: Before using this information
Page 6 and 7: 2.5.3 Increased number of deferred
Page 8 and 9: 4.5.2 Conclusion . . . . . . . . .
Page 10 and 11: 7.4.1 ODBC Unicode support . . . .
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Page 22 and 23: Trademarks The following terms are
Page 24 and 25: Added information The following APA
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Page 28 and 29: Michael Parbs is a DB2 Specialist w
Page 30 and 31: Hugh Smith Jim Teng John Tobler Yoi
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Page 36 and 37: - Column data type changes can be d
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Page 42 and 43: In this chapter we anticipate the a
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Page 62 and 63: ► Parallel sort enhancement Paral
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Page 68 and 69: ► Complexity of the fetch. The fi
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Page 72 and 73: 3.2.1 Creating MQTs MQTs compared t
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Page 78 and 79: Figure 3-9 MQTs and short running q
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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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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
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A.1 Maintenance for DB2 V8 The APAR
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APAR # Area Text PTF and Notes PQ88
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APAR # Area Text PTF and Notes PK21
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B.1 DB2 PE Storage Statistics trace
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Storage heading Description 24 BIT
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C.1 DB2 SQL PA additional reports N
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|is the last matching predicate. Ap
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|ANL6052I *** NOTE: | |This index i
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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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DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

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