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Maintaining aggregates
1.
SAP COMMUNITY NETWORK
SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 1 Maintaining Aggregates in BW Applies to: SAP BI/BW 7.0 and above. For more information visit the Enterprise Data Warehousing Summary This document provides an overview of the use of aggregates in the SAP Business Information Warehouse. The document gives an overview of the aggregates features and a detailed step-by-step solution to Author: Umesh Pednekar Company: Howdens Joinery Co. Created on: 31st Oct 2011 Author Bio Umesh is working as a SAP BI/ BW Analyst in Howdens Joinery co and has techno-functional experience of over 7 years in designing, developing and implementing/upgrading SAP BW-BI solutions across various Industries in India and in the UK.
2.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 2 Table of Contents Overview.............................................................................................................................................................3 Aggregates..........................................................................................................................................................3 Aggregates Roll up and Change Run.................................................................................................................3 Roll up .............................................................................................................................................................3 Change Run ....................................................................................................................................................3 Building Aggregates............................................................................................................................................4 Aggregates Roll up ...........................................................................................................................................14 Roll up Through Process Chains ..................................................................................................................14 Roll up Using a Program...............................................................................................................................17 Aggregates Efficiency.......................................................................................................................................18 Switch On/Off Aggregates.............................................................................................................................18 Delete Aggregates ........................................................................................................................................19 Deactivate Aggregates..................................................................................................................................19 Compressing Aggregates..............................................................................................................................19 Related Content................................................................................................................................................21 Copyright...........................................................................................................................................................22
3.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 3 Overview This document provides an overview of the use of aggregates in the SAP Business Information Warehouse. The document gives an overview of the aggregates features and a detailed step-by-step solution to - Building the aggregates on an Info cube - Rolling up the aggregates on an Info Cube. - Maintaining aggregates efficiency on an Info cube. Aggregates An aggregate is a materialized, summarized view of the data in an InfoCube. In other words, it consolidates and stores a subset of InfoCube data into a database. This subset of data is redundant and persistent. When we execute a query on an InfoCube with appropriate aggregates, the query reads the summarized data directly from the database thus eliminating the need to perform any processing related to summarization during query runtime. Needless to mention, aggregates help access Infocube data quickly during reporting. Aggregates creation sis highly recommended when: - Query execution and navigation requires speeding up. - Navigational attributes are required to be used in the queries. - Hierarchies used in the queries need to be speed up – you can aggregate on specific hierarchy levels. There are a few disadvantages of Aggregates which need to be kept in mind. - They increase load time through data packages uploads; through the hierarchy/attribute change run after loading master data; through adjusting time-dependent aggregates. Aggregates Roll up and Change Run Roll up If the InfoCube has aggregates that have aggregates already filled, then data that has been recently loaded into an InfoCube is not visible for reporting, from the InfoCube or aggregates, until an aggregate roll-up takes place. During this process you can continue to report using the data that existed prior to the recent data load. The new data is only displayed by queries that are executed after a successful roll-up. Change Run A Change Run is executed only in the event of change in the master data. As changes in the master data also trigger changes in navigational attributes or hierarchies, it is recommended that data in the aggregates is adjusted after master data load. This ensures consistency in Reporting results. The change run adjusts the data in the aggregates and turns the modified version of the navigational attributes and hierarchies into an active version. During the change run process, you can carry out Reporting on old master data and hierarchies.
4.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 4 Building Aggregates This section describes to processes involving in creating, filling and activating aggregates. In the DW workbench select the InfoCube you wish to create the aggregates on in the Modeling-InfoProvider tab. Right click and select ‘Maintain Aggregates’. You are prompted to select the option to create ‘Proposals for Aggregates’. If you select ‘Generate Proposals’ that system helps us derive the proposals for various aggregates depending on the statistics data and the input provided by you.
5.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 5 For the sake of this document ,we will create the aggregates manually, so we select the option ‘Create by Yourself’. In the ‘Maintenance for Aggregates’ screen, the system displays list of characteristics, navigational attributes and hierarchies. List of Objects that qualify for creating aggregates can be viewed by expanding the dimensions in the template.
6.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 6 Maintenance for Aggregates screen is used to : - Define aggregates - Obtain information about the status of individual aggregates. We will manually create aggregate on the Characteristics ‘Plant’ – 0PLANT. Select 0PLANT from the template on the left hand side and drag it onto the right hand side screen. You are prompted to enter description for the aggregate. Enter the descriptions, short and long, for the aggregate and Continue. You can now see the aggregate added onto the right hand side. ‘Red’ indicators tell us that the aggregate is not active/filled up.
7.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 7 You have the option of looking at the following parameters for each of the aggregates: - Status – Could be created, changed, Save and active. - Proposed action - Filled/Switched Off – On - Could be not filled / Filled with data – Switch on or off for the queries. - Selection Type - the system aggregates according to the values of the selected objects: * All characteristic values, H Hierarchy level, F Fixed value - Hierarchy – Name of the Hierarchy selected, if any. - Fixed Value – Fixed value selected, if any. - Valuation - Records - Number of records in the filled aggregate. - Records Summarized - Number of records read on average from the source to create a record in the aggregate. (This value should never be equal to 1) - Usage - Number of uses (in queries). - Last Used - Last Roll-up - When was data last entered for the aggregate? - Last Changed on From the top-menu , select ‘Aggregate’ tab which displays a list of sub-menu.
8.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 8 Select ‘Activate and Fill’ . Post processing that could take a few minutes, we are now prompted to run the Aggregates filling and activation job. You can also schedule Parallel run of Initial Fill of Aggregates. Select the option from the menu at the bottom of the screen. Select the desired value as applicable (in particular for Number of parallel processes)
9.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 9 Process Variant (Name) Name of the process. The configuration of a process of a specific type is static, which means it is determined for a definition time. It is described in the context of the process chain as a variant. A variant is always uniquely defined in connection with the type. Example The name of the InfoPackage displays the variants during the loading process. Maximum Number of All Parallel Processes for This type Number of processses of this process type on all permitted servers. Dependencies The default setting is 3. If you do not enter a value, the system chooses the default setting. If you enter 1 for PSAPROCESS (serial processing), background administration is not used. The system continues to use the old program process flow from before SAP NetWeaver 2004s. Save your selections . . To schedule Job for Aggregate Filling and activation – click on ‘Start’ which takes you to the option asking for either ‘Immediate’ run of the process or its scheduling at a ‘later’ date/time. We have selected ‘Immediate’. The process is now scheduled. Wish to check the Background job ? Select ‘Jobs’ from the options available in the bottom menu.
10.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 10 Select ‘Execute’ on the Simple Job Selection screen. The aggregation job is completed successfully in our case. Wish to check the Log? Select the ‘Log’ option. You can analyze the application log.
11.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 11 We go back to the Scheduling screen. Refresh the screen. Confirmation is provided over the consistency of the InfoCube.
12.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 12 Refresh the screen a few times to get the latest Status and the Aggregate Filled indicators. Remember that we can create multiple aggregates based on our requirements and opt for simultaneous Activation and Fill up process. You can see that three aggregates are being considered for activation and fill up process. Select the desired aggregates and then click on the icon for ‘Activate and Fill’. Schedule the process for all the aggregates.
13.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 13 Post process completion, we can see aggregates available on the InfoCube. Go back to the DW Workbench – Select the InfoCube under consideration. And refresh the tree structure to Obtain… The ‘Aggregate’ availability indicator next to the InfoCube
14.
Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 14 Aggregates Roll up Although, aggregates can be rolled up manually, it is highly recommended that a process chain is used to execute this process. Using the data package roll up in a process chain helps eliminating errors during complex flows either by automating related processes and/or by ensuring that dependent processes are integrated with each other. Roll up Through Process Chains You can achieve this by selecting the Infocube under consideration and right click to ‘Manage’ the InfoCube. In the Manage Data Targets screen select ‘Rollup’ tab. The system recommends the greatest possible value for Rollup in the ‘Request ID’ . You can manually set the same.
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Maintaining Aggregates in
BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 15 Now choose the option ‘Process Chain Maintenance’. You are now taken to the RSPC transaction screen and the list of associated process chains is displayed. If you do not have the relevant chain, you can create a new chain. We select the First chain from the list of chains made available. Double click on the desired chain to go to the ‘Process Chain Maintenance Screen’.
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BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 16 We will add the Roll up process at the end of the chain i.e. After Index creation process for the InfoCube is completed. Select icon ‘Process Type’. Expand ‘Data Target Administration’ option and select the Roll up process as shown. Double click and the system prompts you to Create a Variant for the process. Select ‘Create’.
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BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 17 In the Process Maintenance: Roll up of Filled Aggregates/BIA Index screen, select the Infocube for which you wish to add the roll up process – following the data load. Save and Go Back. Continue at the next screen. Make sure that the roll up process follows the desired dependent processes. Save, Activate and Schedule the Chain. Roll up Using a Program You can also roll up using program RSDDK_AGGREGATES_ROLLUP by scheduling it to run as a background job or using it in an Event Collector.
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BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 18 Aggregates Efficiency If aggregates can help improve query performance they are can also prove detrimental to the overall system performance due to the increase in loading times during roll-up and change runs. It always helps to undertake an investigation that can tell you how critical an aggregate is for your queries depending on the requirement from the users. Certain parameters to consider during this process are: - At what frequency is the query executed? (If it is a weekly report – then aggregate roll up need not be a daily process – it could also be done weekly) - How critical is the query performance? - How often are the master data / hierarchy changes done? - Do we need the Change run to be directly associated with the master data/hierarchy change or can it be done at a different frequency? - If the Change run is not associated directly with master data/hierarchy changes, then how often the transaction data uploaded? If weekly then will it helps executing the change run on a weekly basis? - It always helps to build aggregates based on the real life feedback. Now this is possible only if your InfoCube has the necessary aggregates which give you an insight based on the initial response from the system – during data load and query execution. - To optimize an InfoCube, you should repeatedly check: o Whether aggregates are missing: Create new aggregates. o Whether existing aggregates are no longer being used: Delete unnecessary aggregates. Switch On/Off Aggregates You can also switch Off a specific aggregate/s for queries of the InfoCube. This can be done by accessing the specific aggregate/s in the Maintenance for Aggregates scree. Select the aggregate under consideration and then from the ‘Aggregate’ menu – go to option ‘Switch On/Off for Queries’ (or select the icon Switch On/Off) You can see that after switching off the ‘Aggregate Version’ of the Infocube the indicator in the ‘Filled/Switch Off’ is no longer shown Green.
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BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 19 Delete Aggregates To deactivate the aggregate and delete the definition of the aggregate, select the aggregate to be deleted and select the delete function either with Delete or from the context menu of the aggregate. Deactivate Aggregates To delete all the data and database tables of an aggregate, select the required aggregate and choose Deactivate. The status display in the columns Status and Filled/switched off change back to . If you want to, you can activate and fill the aggregate again later. Compressing Aggregates Aggregates can be compressed when they are filled up with data or rolled up from requests in an InfoCube. To achieve this, select the Infocube and right click to ‘Manage’.
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BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 20 In the Manage Data Targets screen select ‘Rollup’ tab. You can set the same compression as show below. When the compression is set, the aggregates are compressed automatically when they either filled with data or rolled up from requests. However, this means that deletion of a request from the Infocube, which is already rolled up to the aggregate, calls for deactivation and rebuilding of the aggregate. If the compression is not switched on, then the aggregates are compressed together with the InfoCube. This option helps if you wish to frequently delete requests from the Infocube. It is always recommended that aggregates are compressed automatically so that they do not become larger and detrimental to the system performance.
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BW SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com © 2011 SAP AG 21 Related Content Performance Tuning for Queries with Aggregates ASAP FOR BW ACCELERATOR Infocube Aggregate Status (History) Performance Optimization with Aggregates For more information visit the Enterprise Data Warehousing
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