IBM/SAP Competency Center November 11, 2008 © 2008 IBM Corporation SAP PSA Table Partitioning Mary Siart IBM STS - SAP on zSeries Technical Specialist IBM Certified Database Administrator DB2 Universal Database V8.1 for zOS

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IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 4 PSA Table Partitioning  Before loading a request it checks whether the number of records has exceeded the partition size given in transaction RSCUSTV6 (default 1mio) If not, it loads into the "current" partition. If yes, it adds another partition (or reuses a partition that has been rotated before). The new partition becomes "current".  Prior to SAP Note (9/2008) a request is never split over partitions Thus, a partition can have considerable more than a million records, if a huge request is loaded. When loading in parallel, all processes will check the number of records in the "current" partition at the beginning and may all find that the partition size is not reached. So all parallel loaded requests will go into the same partition regardless how high the sum of records in all requests. This can be overcome by allowing only one request per partition, see SAP note

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 5 PSA Table Partitioning  SAP Note PSA request in several table partitions  Import one of the following Support Packages: o SAP BI 7.00 Support Package 20 o SAP BI 7.00 Enhancement Package 1 Support Package 2  The PSA table is partitioned during creation using the column PARTNO and the column RECORD. The (logical) partitioning remains unchanged and references the column PARTNO. Now there can be several physical partitions for each logical partition. All physical partitions have the same value for PARTNO, but different values for RECORD. Entries in the table RSADMIN to control how many physical partitions created for logical partition based on column PARTNO. Add entry with the prefix DB2_MULTIPART in the column OBJECT of the table RSADMIN. The syntax is as follows:,,.

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 6 PSA Table Partitioning  If you want to load 4 millions records within one request, it is possible that it does not fit into one partition. Since SAP BI does not split a request, you need to increase DSSIZE of that PSA table. If parameter DB2_PSA_DSSIZE is set in table RSADMIN, SAP BI will use the given DSSIZE when a PSA table is created, See SAP note  PSA versioning implemented RSDU_PSAACTIV_NEWVERS_EXIT Force a new version during PSA activation by setting the RSAMIN parameter DB2_PSA_DSSIZE or DB2_PSA_BPOOL_DATA SAP NetWeaver 7.0 BI; Import Support Package 18 for SAP NetWeaver 7.0 BI (BI Patch 18 or SAPKW70018) SAP NetWeaver 7.1 BI; Import Support Package 06 for SAP NetWeaver 7.1 BI (BI Patch 06 or SAPKW71006) See SAP note

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 7 Considerations for Large Infocubes  Carefully consider level of granularity for navigation (  infocube) for reporting (  data store)  Consider multi-provider approach Splitting data into infoproviders that have equal structure Queries should access one or a small number of basis infoproviders only  Utilize DB2 data compression  Activate partitioning of infocubes and PSA  Increase DSSIZE of fact and PSA tables RSADMIN parameters DB2_FACT_DSSIZE and DB2_PSA_DSSIZE See SAP note and DSSIZE cannot be ALTERed!  Increase page size of fact and PSA tables Assign appropriate bufferpool See SAP note Page size cannot be ALTERed!  Estimate number and size of partitons Be aware of interdependency of page size, dataset size and number of partitions; see next slide

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 8 Maximum Number of Partitions Page size DSSIZE 4 KB8 KB16 KB32 KB 1 GB TB 2 GB TB 4 GB TB 8 GB TB TB 16 GB TB TB TB 32 GB TB TB TB TB 64 GB TB TB TB TB

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 9 PSA Partitioning (cont‘)  Implementation with DB2 V8 Always active, there is no option PSA tables are initially created with one partition A partition is added dynamically, if necessary Empty partitions are rotated to the end and are reused later on     2 

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 10 Migrating the partitioning of PSA tables  Migrating from DB2 V7 to DB2 V8 DB2 V7 does not allow the dynamic creation of partitions DB2 V8 allows the dynamic creation (ADD PARTITION) and rotation of partitions.  Import one of the following Support Packages: SAP BW 3.50 Support Package Stack 21 SAP BI 7.00 Support Package 16  Implement the Z_MIGRATE_PSA_TABLES_DB2 ABAP report attached SAP note Checks all partitioned PSA and ODS change log tables created in V7 and, if necessary, migrates them to the new schema. For all PSA tables not yet partitioned, Execute the RS_BW_POST_MIGRATION post migration report and choose the L_PSAVER option only. This report creates new partitioned versions of all non-partitioned PSA tables.  Keep looking for SAP Note to become available Provides report Z_CONVERT_CHANGELOG_DB2 to convert ODS change log tables (currently in pilot and not available)  DB2 9 SAP BI exploits range-partitioned UTS Supports fast truncation of a partition when it is ROTATEed.

IBM/SAP Competency Center IBM Solutions for SAP © 2008 IBM Corporation 11 PSA Table Partitioning  Review SAP notes: SAP Note Number DB2/390: BW: Size of a partition, DSSIZE SAP Note Number DB2-z/OS: BW: Data in the PSA table is lost SAP Note Number Request in different PSA partitions SAP Note Number DB2 z/OS: BW: Problem during insert into new PSA partition SAP Note Number DB2 z/OS: BW: Only one request per partition in PSA load SAP Note Number DB2-z/OS: BW: Migrating the partitioning of PSA tables SAP Note Number DB2-z/OS: Versioning: New EXIT module SAP Note Number DB2-z/OS: BI: One PSA request in several table partitions  Reference Redbook Best Practices for SAP Business Information Warehouse on DB2 UDB for z/OS V8; SG