BW Questions


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BW Questions 1. How many characteristics can be found in a Dimension table ---- (248) 2. What is the limit on Key figures in a Fact table----(233) 3. What are the types of Hierarchies a. Hierarchy not time-dependent. b. Entire Hierarchy is time-dependent. c. Time-dependent Hierarchy structure. 4. What is Extended Star Schema ? 5. Explain Conversion Routine ? a. ALPHA, NUMCV, GJAHR 6. What is Info Sets ? 7. First we load master data then we will Apply Hierarchy/Attribute Change and finally we do
    BW Questions 1. How many characteristics can be found in a Dimension table ---- (248)2. What is the limit on Key figures in a Fact table----(233)3. What are the types of Hierarchiesa. Hierarchy not time-dependent.b. Entire Hierarchy is time-dependent.c. Time-dependent Hierarchy structure.4. What is Extended Star Schema ?5. Explain Conversion Routine ?a. ALPHA, NUMCV, GJAHR6. What is Info Sets ?7. First we load master data then we will Apply Hierarchy/Attribute Change and finallywe do transaction data load  –  Why we are following this way to load the data ?8. What is Line Item Dimension ?dimension table contains only one characteristics9. Different types of Key Figures in BEX:Restricted Key figures & Calculated Key figures10. Difference between PSA transfer method and IDoc transfer method?11. How many dimensions can a cube have?16 out of which 3 are system defined. Time, Unit and Data packets12. How many tables in ODS ?Total 3 tables - (New data, Change log, Active)On process chains : What are the extractor types? ã Application S pecifico BW Content FI, HR, CO, SAP CRM, LO Cockpito Customer-Generated ExtractorsLIS, FI-SL, CO-PA ã Cross Application (Generic Extractors) o DB View, InfoSet, Function Module2. What are the steps involved in LO Extraction? ã The steps are:  o RSA5 Select the DataSourceso LBWE Maintain DataSources and Activate Extract Structureso LBWG Delete Setup Tableso 0LI*BW Setup tableso RSA3 Check extraction and the data in Setup tableso LBWQ Check the extraction queueo LBWF Log for LO Extract Structureso RSA7 BW Delta Queue Monitor3. How to create a connection with LIS InfoStructures?    ã LBW0 Connec ting LIS InfoStructures to BW4. What is the difference between ODS and InfoCube and MultiProvider? ã ODS: Provides granular data, allows overwrite and data is in transparent tables, ideal for drilldown and RRI. ã CUBE: Follows the star  schema, we can only append data, ideal for primaryreporting. ã MultiProvider: Does not have physical data. It allows to access data from different InfoProviders (Cube, ODS, InfoObject). It is also preferred for reporting.5. What are Start routines, Transfer routines and Update routines? ã Start Routines: The start routine is run for each DataPackage after the data has been written to the PSA and before the transfer rules have been executed. It allowscomplex computations for a key figure or a characteristic. It has no return value. Itspurpose is to execute preliminary calculations and to store them in global DataStructures.This structure or table can be accessed in the other routines. The entire DataPackage inthe transfer structure format is used as a parameter for the routine. ã Transfer / Update Routines: They are defined at the InfoObject level. It is like the Start Routine. It is independent of the DataSource. We can use this to define Global Dataand Global Checks.6. What is the difference between start routine and update routine, when, how and whyare they called? ã Start routine can be used to access InfoPackage while update routines are used while updating the Data Targets.7. What is the table that is used in start routines? ã Always the table structure will be the structure of an ODS or InfoCube. For  example if it is an ODS then active table structure will be the table.8. Explain how you used Start routines in your project? ã Start ro utines are used for mass processing of records. In start routine all therecords of DataPackage is available for processing. So we can process all these recordstogether in start routine. In one of scenario, we wanted to apply size % to the forecastdata. For example if material M1 is forecasted to say 100 in May. Then after applyingsize %(Small 20%, Medium 40%, Large 20%, Extra Large 20%), we wanted to have 4records against one single record that is coming in the info package. This is achieved instart routine.9. What are Return Tables? ã When we want to return multiple records, instead of single value, we use the return table in the Update Routine. Example: If we have total telephone expense for a CostCenter, using a return table we can get expense per employee.10. How do start routine and return table synchronize with each other? ã Return table is used to return the Value following the execution of start routine    11. What is the difference between V1, V2 and V3 updates? ã V1 Update: It is a Syn chronous update. Here the Statistics update is carried out at thesame time as the document update (in the application tables). ã V2 Update: It is an Asynchronous update. Statistics update and the Document update take place as different tasks.o V1 & V2 don’t need scheduling.   ã Serialized V3 Update: The V3 collective update must be scheduled as a job (via LBWE). Here, document data is collected in the order it was created and transferred intothe BW as a batch job. The transfer sequence may not be the same as the order in whichthe data was created in all scenarios. V3 update only processes the update data that issuccessfully processed with the V2 update.12. What is compression? ã It is a process used to delete the Request IDs and this saves space.  13. What is Rollup? ã This is used to load new DataPackages (requests) into the InfoCube aggregates. If we have not performed a rollup then the new InfoCube data will not be available whilereporting on the aggregate.14. What is table partitioning and what are the benefits of partitioning in an InfoCube? ã It is the method of dividing a table which would enable a quick reference. SAP uses fact file partitioning to improve performance. We can partition only at 0CALMONTH or0FISCPER. Table partitioning helps to run the report faster as data is stored in therelevant partitions. Also table maintenance becomes easier. Oracle, Informix, IBMDB2/390 supports table partitioning while SAP DB, Microsoft SQL Server, IBMDB2/400 do not support table portioning.15. How many extra partitions are created and why? ã Two partitions are created for date before the begin date and after the end date.  16. What are the options available in transfer rule? ã InfoObject   ã Constant   ã Routine   ã Formula  17. How would you optimize the dimensions? ã We should define as many dimensions as possible and we have to take care that no single dimension crosses more than 20% of the fact table size.18. What are Conversion Routines for units and currencies in the update rule? ã Using this option we can write ABAP code for Units / Currencies conversion. If we enable this flag then unit of Key Figure appears in the ABAP code as an additionalparameter. For example, we can convert units in Pounds to Kilos.  19. Can an InfoObject be an InfoProvider, how and why? ã Yes, when we want to report on Characteristics or Master Data. We have to right click on the InfoArea and select ―Insert characteristic as data target‖. For example, we can make 0CUSTOMER as an InfoProvider and report on it.20. What is Open Hub Service? ã The Open Hub Service enables us to distribute data from an SAP BW system into external Data Marts, analytical applications, and other applications. We can ensurecontrolled distribution using several systems. The central object for exporting data is theInfoSpoke. We can define the source and the target object for the data. BW becomes ahub of an enterprise data warehouse. The distribution of data becomes clear throughcentral monitoring from the distribution status in the BW system.21. How do you transform Open Hub Data? ã Using BADI we can transform Open Hub Data according to the destination requirement.22. What is ODS? ã Operational DataSource is used for detailed storage of data. We can overwrite data in the ODS. The data is stored in transparent tables.23. What are BW Statistics and what is its use? ã They are group of Business Content InfoCubes which are used to measure performance for Query and Load Monitoring. It also shows the usage of aggregates, OLAP andWarehouse management.24. What are the steps to extract data from R/3? ã Replicate DataSources   ã Assign InfoSources   ã Maintain Communication Structure and Transfer rules   ã Create an InfoPackage ã Load Data  25. What are the delta options available when you load from flat file? ã The 3 options for Delta Management with Flat Files:  o Full Uploado New Status for Changed records (ODS Object only)o Additive Delta (ODS Object & InfoCube)26. Under which menu path is the Test Workbench to be found, including in earlierReleases?The menu path is: Tools - ABAP Workbench - Test - Test Workbench.Q) I want to delete a BEx query that is in Production system through request. Is anyoneaware about it?Q) Have you tried the RSZDELETE transaction?
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