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

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5.1 System level point-in-time recovery Prior to DB2 V8 you could make an external copy of your production system by delimiting the back up activity with the -SET LOG SUSPEND and -SET LOG RESUME commands. DB2’s update activity and logging, while you were making the external copy of your DB2 system, was suspended. DB2 V8 introduces the new BACKUP SYSTEM and RESTORE SYSTEM utilities. This provides an easier and less disruptive way to make fast volume-level backups of an entire DB2 subsystem or data sharing group with minimal disruption, and recover a subsystem or data sharing group to any point-in-time, regardless of whether or not you have uncommitted units of work. At DB2 restart, the uncommitted URs are resolved during the forward and backward recovery phase. These new utilities rely on the new Fast Replication in DFSMS 1.5. DFSMS provides a volume-level fast replication function that allows you to create a backup that is managed by DFSMShsm with minimal application outage. DFSMShsm recovers a Fast Replication backup version from the volume or copy pool level, but not at the data set level. This function enables the backup and recovery of a large set of volumes to occur within a small time frame. The term Fast Replication refers to the FlashCopy function supported by IBM TotalStorage® Enterprise Storage Server® (ESS) disk and the SnapShot function supported by IBM RAMAC® Virtual Array (RVA) disk. ► The BACKUP SYSTEM utility provides fast volume-level copies (versions) of DB2 databases and logs. ► The RESTORE SYSTEM utility recovers a DB2 system to an arbitrary point-in-time. RESTORE SYSTEM automatically handles any creates, drops, and LOG NO events that might have occurred between the backup and the recovery point-in-time. Prerequisites for this feature In order to use the BACKUP SYSTEM and RESTORE SYSTEM utilities, all data sets that you want to back up and recover must be SMS-managed data sets. Additionally, you must have the following requirements: ► z/OS V1R5, DFSMShsm, DFSMSdss. ► Disk control units that support ESS FlashCopy API (we recommend FlashCopy V2). ► SMS copy pools that are defined by using the DB2 naming convention. ► Defined SMS copy pool backup storage groups. ► DB2 has to be running in new-function mode. RESTORE SYSTEM LOGONLY option has no dependency on z/OS 1.5. A copy pool is a set of SMS-managed storage groups that can be backed up and restored with a single command. A copy pool backup is a new storage group type that is used as a container for copy pool volume copies. Each volume in the copy pool storage group needs to have a corresponding volume in the copy pool backup storage group. For each copy pool volume as many backup volumes as backup versions defined for the copy pool should be available in the copy pool backup. Each DB2 system has up to two copy pools, one for databases and one for logs. The name of each copy pool that is to be used with DB2 must use the following naming conventions: DSN$locn-name$cp-type The variables that are used in this naming convention have the following meanings: 218 DB2 UDB for z/OS Version 8 Performance Topics
► DSN: Unique DB2 product identifier. ► $: Delimiter. ► locn-name: DB2 location name. ► cp-type: copy pool type. Use DB for the database copy pool and LG for the log copy pool. You have to set up both copy pools properly in order to successfully implement system level point-in-time recovery: The “log” copy pool should be set up to contain the volumes that contain the BSDS data sets, the active logs, and their associated ICF catalogs. The “database” copy pool should be set up to contain all the volumes that contain the databases and the associated ICF catalogs. Important: Make sure that the ICF catalog for the data is on an other volume than the ICF catalog for the logs. Three new DFSMShsm commands are introduced to support this new function, and other commands are changed to provide new information related to the DFSMShsm Fast Replication function: ► FRBACKUP: Create a fast replication backup version for each volume in a specified copy pool. ► FRRECOV: Use fast replication to recover a single volume or a pool of volumes from the managed backup versions ► FRDELETE: Delete one or more unneeded fast replication backup versions. LIST and QUERY commands are modified to aid monitoring of the fast replication backup versions. Prepare for fast replication After establishing the copy pools, the storage administrator issues FRBACKUP PREPARE against each copy pool. The PREPARE allows you to validate your fast replication environment for DFSMShsm. DFSMShsm preassigns the required number of target volumes to each source volume in each storage group in the specified copy pool. When you specify the PREPARE keyword, DFSMShsm verifies that there is a sufficient number of eligible target volumes in the specified copy pool backup storage group. For instance, if you specified in the copy pool definition that DFSMShsm should keep two backup versions, then DFSMShsm preassigns two target volumes to each source volume in the copy pool. You should use the PREPARE keyword whenever there is a change in the fast replication environment. Changing any of the following definitions will change the fast replication environment: ► The volumes in the copy pool or copy pool backup storage groups are changed or removed. ► The number of backup versions for DFSMShsm to maintain is changed. ► The storage groups defined to the copy pool have changed. Important: It is recommended to run the PREPARE after each copy pool assignment since it removes the time for target volume selection from the BACKUP execution window. Otherwise the prepare phase will be executed implicitly when the backup starts and will elongate its execution. Chapter 5. Availability and capacity enhancements 219
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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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Page 216 and 217: 4.7.1 Performance The improvements
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Page 226 and 227: ► The security level that defines
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Page 240 and 241: This message is completed with the
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Page 252 and 253: BACKUP SYSTEM During backup DB2 rec
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Page 258 and 259: 5.1.2 Conclusion The BACKUP SYSTEM
Page 260 and 261: Figure 5-7 shows the sliding scale
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Page 264 and 265: For dynamically prepared queries, D
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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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