Best Practices for SAP BI using DB2 9 for z/OS - IBM Redbooks

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DSNU610I -DB2T 081 16:36:03.85 DSNUSUPD - SYSCOLDISTSTATS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2 SUCCESSFUL DSNU604I -DB2T 081 16:36:03.85 DSNUSEOF - INDEXSPACE IS EMPTY DSNU610I -DB2T 081 16:36:03.85 DSNUSUCO - SYSCOLUMNS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~0 SUCCESSFUL DSNU610I -DB2T 081 16:36:03.85 DSNUSUIX - SYSINDEXES CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~0 SUCCESSFUL DSNU604I -DB2T 081 16:36:03.87 DSNUSEOF - INDEXSPACE IS EMPTY DSNU610I -DB2T 081 16:36:03.87 DSNUSUCO - SYSCOLUMNS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~040 SUCCESSFUL DSNU610I -DB2T 081 16:36:03.87 DSNUSUIX - SYSINDEXES CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~040 SUCCESSFUL DSNU604I -DB2T 081 16:36:03.87 DSNUSEOF - INDEXSPACE IS EMPTY DSNU610I -DB2T 081 16:36:03.87 DSNUSUCO - SYSCOLUMNS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~050 SUCCESSFUL DSNU610I -DB2T 081 16:36:03.87 DSNUSUIX - SYSINDEXES CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~050 SUCCESSFUL DSNU604I -DB2T 081 16:36:03.87 DSNUSEOF - INDEXSPACE IS EMPTY DSNU610I -DB2T 081 16:36:03.87 DSNUSUCO - SYSCOLUMNS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~060 SUCCESSFUL DSNU610I -DB2T 081 16:36:03.88 DSNUSUIX - SYSINDEXES CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~060 SUCCESSFUL DSNU604I -DB2T 081 16:36:03.88 DSNUSEOF - INDEXSPACE IS EMPTY DSNU610I -DB2T 081 16:36:03.88 DSNUSUCO - SYSCOLUMNS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~070 SUCCESSFUL DSNU610I -DB2T 081 16:36:03.88 DSNUSUIX - SYSINDEXES CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~070 SUCCESSFUL DSNU604I -DB2T 081 16:36:03.88 DSNUSEOF - INDEXSPACE IS EMPTY DSNU610I -DB2T 081 16:36:03.88 DSNUSUCO - SYSCOLUMNS CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~080 SUCCESSFUL DSNU610I -DB2T 081 16:36:03.88 DSNUSUIX - SYSINDEXES CATALOG UPDATE FOR BI9DB./BIC/EZGMA2~080 SUCCESSFUL DSNU620I -DB2T 081 16:36:03.89 DSNUSEOF - RUNSTATS CATALOG TIMESTAMP = 2007-03-22-16.36.00.422387 DSNU010I 081 16:36:04.01 DSNUGBAC - UTILITY EXECUTION COMPLETE, HIGHEST RETURN CODE=0 > connection: DEFAULT DB2 User: SAPR3 Since some specific RUNSTATS options are used for BI tables, statistics should not be created for SAP BI systems using external tools. Use the “RUNSTATS on objects needing new statistics” option in the planning calendar (DB13) to update the DB2 statistics. We recommend that you schedule this to run daily or at least once a week, preferably at night. Since the DB2 statistics for BI programs are already updated automatically for most BI tables, the DB13 statistics update should be very quick. Some additional comments: ► RUNSTATS on the partition level. For performance reasons, SAP BI uses only the PART option of RUNSTATS if the partitioned table has more than one million rows. ► Call RUNSTATS only if necessary means that RUNSTATS is only called if the old database statistics need to be refreshed. For this, the real time statistics (RTS) data are compared against the old statistics. If more than 10% of the data has been changed or if the table is small (fewer than 1000 rows), RUNSTATS is called again. More details are described in SAP note 915398. Additionally, this note describes the input parameter of the above-used function module RSDU_ANALYZE_TABLE_DB2. 44 Best Practices for SAP BI using DB2 9 for z/OS
Figure 4-7 explains how to influence the DB2 optimizer to use the appropriate index by explicitly faking the DB2 statistics. You will find the details in SAP note 688133. Make sure that you test your RSADMIN entries by running function module RSDU_ANALYZE_TABLE_DB2 for the given table and check the output list where the generated and executed INSERT or UPDATE statements are shown. Figure 4-7 further highlights SAP note 688133. How to influence DB2 statistics (note 688133) � specific RSADMIN parameters for influencing the DB2 statistics � Use this possibility only if no other solution helps � Collect additional frequencies for an given index – DB2_""= FREQVAL NUMCOLS n COUNT c Example: DB2_"/BIC/DMYDIMT~0" = FREQVAL NUMCOLS 5 COUNT 30 � Change the clusterratio of an index -> to force the optimizer to use a known index set the clusterratio to 100 – DB2_"" = CLUSTERRATIO x Example: DB2_"/BIC/FMYCUBE~030" = CLUSTERRATIO 100 – DB2 catalog is updated accordingly after the RUNSTATS run Figure 4-7 Faking the DB2 statistics with RSADMIN parameters 4.2.2 New to DB2 9: histogram statistics In this section we discuss histogram statistics. Overview and advantages Data distribution statistics are very important for query optimization. DB2 chooses the best access path based on costing, and the very basic foundation of costing is predicate selectivity estimation, which heavily relies on data distribution statistics. Up to DB2 v8, the only distribution statistics supported in DB2 for z/OS were frequency statistics collected on single values, which could be for either single-column or multi-column. For multi-column, it is a concatenated multi-column value. Such frequency statistics are most commonly collected on the most biased values (that is, the most frequent or the least frequent). Chapter 4. Benefits of DB2 9 for SAP BI 45
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Best Practices for SAP BI using DB2
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Note: Before using this information
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4.4 Extended sparse index and in-me
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11.3 SAP BI database and InfoCube l
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viii Best Practices for SAP BI usin
Page 12 and 13: Trademarks The following terms are
Page 14 and 15: The team that wrote this IBM Redboo
Page 16 and 17: Thanks to these authors from the Pr
Page 18 and 19: ► Send your comments in an e-mail
Page 20 and 21: 1.1 Product overview The business w
Page 22 and 23: In general, database administrators
Page 24 and 25: ► Horizontal growth is achieved b
Page 26 and 27: 8 Best Practices for SAP BI using D
Page 28 and 29: 2.1 BI architecture Figure 2-1 show
Page 30 and 31: New term Old term Analysis authoriz
Page 32 and 33: negative values means missing stati
Page 34 and 35: - When calculating database statist
Page 36 and 37: If you specify a partitioning schem
Page 38 and 39: Important: Never partition a PSA ta
Page 40 and 41: Figure 2-10 DPSIs versus NPSIs Figu
Page 42 and 43: Finally, Figure 2-12 explains which
Page 44 and 45: Figure 2-14 shows how the snowflake
Page 46 and 47: ► Realignment This refers to the
Page 48 and 49: 3.1 Base recommendations - SAP BI i
Page 50 and 51: the F- fact table, the E- fact tabl
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Page 54 and 55: 4.1 Dynamic index ANDing for star s
Page 56 and 57: Figure 4-2 and Figure 4-3 on page 3
Page 58 and 59: 4.2.1 Processing RUNSTATS for BI ta
Page 60 and 61: RUNSTATS will then be called over t
Page 64 and 65: Often the single-value based freque
Page 66 and 67: Several things worth noting are:
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Page 70 and 71: condition, generated by SAP BI upon
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Page 74 and 75: 5.1 Load PSA In this section we dis
Page 76 and 77: 5.1.1 Load PSA To load data into th
Page 78 and 79: After the source system, the DataSo
Page 80 and 81: Note the available tabs (registers)
Page 82 and 83: Figure 5-8 shows the provided optio
Page 84 and 85: Figure 5-10 shows the following:
Page 86 and 87: The PSA table name is created autom
Page 88 and 89: 5.1.4 PSA partitioning Partitioning
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Page 92 and 93: An InfoCube, whether data target or
Page 94 and 95: 6.1 Types of InfoCubes Data targets
Page 96 and 97: After selecting at least one time d
Page 98 and 99: 6.2.1 Repartitioning implementation
Page 100 and 101: You will then be presented with a w
Page 102 and 103: From within the monitor you are abl
Page 104 and 105: Once your repartitioning process is
Page 106 and 107: Figure 6-14 is displayed once you h
Page 108 and 109: When you remodel an InfoProvider yo
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At this step of the process you are
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6.3.2 Benefits of remodeling InfoPr
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6.4.3 Cumulative data versus non-cu
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Important: After the initial compre
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► Use DPSIs for the cube’s E- f
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7.1 Differences between DataStore a
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Figure 7-1 shows the initial status
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4. By selecting the Create button,
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Partitioning and clustering are bot
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7.4.2 Choosing and changing the clu
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7.4.4 Partitioning a DataStore obje
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From the ABAP Dictionary: Utility f
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Figure 7-9 DB2/390 Storage Attribut
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partitioning was used. The CREATE T
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, "/BIC/RECORDMODE" POSITION( 00289
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Upon completion of the job, you wil
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| "/BIC/DIVISION" VARGRAPHIC (00000
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| sql: | DELETE FROM DDSTORAGE | WH
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| "/BIC/CRMEM_VAL" DECIMAL (000017,
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| DDL time(___8): .........4 millis
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134 Best Practices for SAP BI using
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8.1 Troubleshooting general system
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You need to ascertain: ► Which us
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Further information about the subje
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8.2 Analyzing load performance In t
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We use transaction ST03 → Expert
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Click the Details tab of the RSMO w
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Select the component of interest to
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Figure 8-11 All statistical records
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Figure 8-13 Single statistical reco
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Loading from a flat file You can av
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and right-click to select the Simul
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Note: You must activate the saving
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5. In the right-hand panel of the w
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If your query has long run times th
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that the query runs against → Mai
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If the main component of query perf
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► Display Statistics Data (to sho
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Select the appropriate button, ente
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Figure 8-29 Statement details To ch
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The ratio (ST04 statement cache “
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Figure 8-32 Visual Explain - SQL te
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8.5 SAP Query Analysis Tool The SAP
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Display of sql access path SQL quer
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The access path is displayed hierar
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The table information tab shown in
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DB2 Plan Table Figure 8-42 DB2 plan
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Graphical view of each query block
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Now you see the graphical view of t
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8.5.4 Example of using the query an
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9.1 The BIA architecture Figure 9-1
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Figure 9-2 BIA t-shirt sizing The B
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From the hardware side, the BIA is
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9.7 Overview The improvement of the
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10.1 SQL efficiency for DSO Queries
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The first join predicate is "/BIC/A
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Figure 10-5 Associate local predica
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Step 3 is repeated for each master
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Using the InfoCube query example in
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The first join predicate in Figure
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Thus, we have broken down the origi
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Figure 10-14 Comparing filtering Th
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AND "/BIC/AZOSASALE00"."PLANT" = "/
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Column Local or join CALMONTH Local
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10.4 Indexing of InfoCubes The defa
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11.1 Background To be more competit
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11.2.1 Hardware and software config
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11.2.2 Network infrastructure IBM S
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the chassis for blade-to-blade conn
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As part of the pre-benchmark planni
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11.4 Test case scenarios The goal o
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Figure 11-3 explains the data flow
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In addition, each cube, especially
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Measurement results Table 11-2 prov
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Figure 11-7 shows the average CPU u
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The number of queries per hour show
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Figure 11-10 shows that the average
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11.5.1 Recommendations for configur
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12.1 Terminology: BI objects and pr
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Metadata plays a fundamental role i
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12.3 Dataflow in SAP BI Data flow i
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12.4 Information access As previous
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Predecessor Successor WW Sales Euro
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An InfoCube in SAP BI can have up t
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12.8 Aggregates 4. The dimension ta
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The next example is an aggregate th
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For example, assume that different
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can be updated into InfoCubes or ot
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Figure 12-11 shows the steps that o
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Figure 12-12 on page 279 shows the
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The content, depicted in Figure 12-
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considerably more data records are
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The nodes stand for data sources, t
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values, hierarchies, hierarchy node
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BI SAP Query Connector A resource a
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Business Intelligence Cockpit Web-b
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processors in terms of macros that
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Crystal Reports Designer Design com
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Similar to the OLAP-standard term c
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P table Master data table for time-
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The process instance contains the m
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Relational Query Model An abstracti
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SAP Business Information Warehouse
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source object element Component of
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elements to be displayed in the Web
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Web application object catalog Web
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You insert one or more queries in t
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IT scenario The environment we used
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Checks under z/OS and DB2 We recomm
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To check that the SAPCL procedure w
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List of SAP BW OSS Notes Table C-1
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SAP BI on DB2 for z/OS 390016 BW Da
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Network configuration: static multi
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START CU091060 START CU0A1070 START
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Table name Average row length Total
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Table name Average row length Total
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Parameters BPK16K0 BPK16K1 VIRTUAL
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drwxr-xr-x 3 t11adm sapsys 2048 200
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Example D-6 shows a cube index crea
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B49/S_RTNSVAL 24 DECIMAL 17 2 N 4 N
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-rw-r--r-- 1 t11adm sapsys 2084482
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-rw-r--r-- 1 t11adm sapsys 547449 2
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Online resources These Web sites ar
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Help from SAP SAP Support and downl
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C Candidates for partiioning Data W
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M master data 155, 211, 258, 277 si
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star schema 265-266 also see InfoCu
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Best Practices for SAP BI using DB2
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