How To...Consume HANA Models with Input Parameters in BW Virtual Providers

Transcription

1 SAP How-to Guide Database & Technology SAP HANA Appliance How To...Consume HANA Models with Input Parameters in BW Virtual Providers Applicable Releases: SAP HANA 1.0 SPS 04 SAP BW powered by HANA 7.3 SP9 Version 1.0 January 2013

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3 Document History Document Version Description 1.00 First version of this guide

4 Typographic Conventions Type Style Example Text Description Words or characters quoted from the screen. These include field names, screen titles, pushbuttons labels, menu names, menu paths, and menu options. Cross-references to other documentation Icons Icon Description Caution Note or Important Example Recommendation or Tip Example text Example text Example text <Example text> EXAMPLE TEXT Emphasized words or phrases in body text, graphic titles, and table titles File and directory names and their paths, messages, names of variables and parameters, source text, and names of installation, upgrade and database tools. User entry texts. These are words or characters that you enter in the system exactly as they appear in the documentation. Variable user entry. Angle brackets indicate that you replace these words and characters with appropriate entries to make entries in the system. Keys on the keyboard, for example, F2 or ENTER.

5 Table of Contents 1. Business Scenario Background Information Prerequisites Step-by-Step Procedure Create Analytical View in SAP HANA Create VirtualProvider in SAP BW Create BEx Query based on the Virtual Provider Verify the results Limitations Appendix... Error! Bookmark not defined.

6 How To...Consume HANA Models with Input Parameters in BW Virtual Providers 1. Business Scenario In SAP BW 7.30 powered by SAP HANA, it is possible to create Virtual Providers which are based on SAP HANA (HANA) Models. This provides a powerful means of integrating native HANA models into the SAP BW environment; thereby leveraging some of SAP BW s powerful capabilities like Hierarchies, Analysis Authorizations, centrally governed Master Data/Texts. However, it is common practice to design HANA models to be configurable via Input Parameters and consumption of such models in BW Virtual Providers can be tricky. It is important here to mention the difference between Input Parameters and Variables in HANA. Variables are used purely to restrict the data dynamically based on user input whereas input parameters provide a means of creating models which can be configured dynamically based on user input. Although input parameters can be employed in HANA models for a variety of use-cases, they are most often used in formulas for calculated measures. Hence for the purpose of illustration, this document addresses a very basic Sales Deviation Analysis scenario where a company reports on year-on-year deviation in sales with the users having the flexibility to dynamically choose the years being compared in the analysis. This how-to guide describes how such a scenario can be modeled as a native HANA model with input parameters for defining the years of comparison. The HANA model is subsequently consumed in a BW Virtual Provider. The users report on the data based on a BEx Query built on top of the Virtual Provider. 2. Background Information The procedure of creating VirtualProviders based on a HANA Models in SAP BW is described here in detail set.htm. The VirtualProvider in BW is an InfoProvider based on InfoObjects. The InfoObjects Characteristics and KeyFigures are mapped to the corresponding Attributes and Measures of the HANA model respectively. However, to allow the users the option to supply values to the HANA model input parameters via a BEx Query, there are two basic steps needed Map the input parameters to InfoObjects in the BW Virtual Provider. If there are no InfoObjects existing for re-use, they may need to be created in the BW system. In the BEx Query built on top of the VirtualProvider, create BEx Variables to allow users to supply values to the HANA Model input parameters. The following sections of the document describe how this can be done for the Sales Deviation Analysis scenario in a step-by-step manner. January

7 How To...Consume HANA Models with Input Parameters in BW Virtual Providers 3. Prerequisites This how-to guide is intended for readers building scenarios which combine native HANA Models with the SAP BW environment, popularly called HANA-BW Mixed Scenarios. Readers with prior experience in modeling in the HANA Studio and SAP BW will benefit the most from the document. Release Information o SAP BW powered by HANA The feature described in this how-to guide is available starting from SAP BW 7.30 powered by HANA SP9 or SAP NetWeaver BW 7.31 (SAP NW BW7.0 EnhP 3).. The feature can also be made available by applying the SAP Note However, the pre-requisite support package for applying the note is SP7. This feature has to be explicitly switched-on in the SAP BW system using the RSADMIN parameter RSDRV_HANA_INPUTPARAM_ALLOWED (even in SP9). The parameter can be set by using the standard SAP report SAP_RSADMIN_MAINTAIN. A value X, against this parameter switches the feature ON in the system. Relevant SAP Notes Also refer the SAP Notes and o HANA The parameterization of HANA models with Input Parameter is available starting from HANA 1.0 SP4 Relevant SAP Notes Also refer the SAP Note January

8 ... How To...Consume HANA Models with Input Parameters in BW Virtual Providers 4. Step-by-Step Procedure The Year-on-Year Sales Deviation Analysis scenario is addressed by creating an Analytical View in HANA with Input Parameters I_CALYEAR_1 and I_CALYEAR_2 - for the two years being compared. The Sales Amount for each year is implemented as calculated measure which uses the value of the corresponding Input Parameter to compute the Sales Amount. The year-on-year deviation in Sales Amounts is calculated as the difference between the individual sales amounts of the two years. The HANA model is consumed in a BW VirtualProvider by mapping the attributes and measures to corresponding BW InfoObjects. Further, two new InfoObjects ICALYR_1 and ICALYR_2 are created for the mapping the Input Parameters defined above. A BEx Query is defined on the VirtualProvider with Variables on the two InfoObjects ICALYR_1 and I_CALYR_2 to allow users the option of choosing the years of comparison at query runtime. 4.1 Create Analytical View in HANA 1. Create Analytical View in HANA Studio. Below is a screen-shot of an Analytical View in the HANA Studio. The Analytical View is based on monthly sales data of a company. Notice that the model contains the attribute CALYEAR and the measure SALES. January

9 How To...Consume HANA Models with Input Parameters in BW Virtual Providers 2. To enable users to select the years at query runtime, two Input Parameters I_CALYEAR_1 and I_CALYEAR_2 are created. 3. Two calculated measures SALES_T1 and SALES_T2 - are created to compute the sales amount of Year 1 and Year 2 respectively. Notice how the Input Parameters created above are used in the formula as place-holders. January

10 ... How To...Consume HANA Models with Input Parameters in BW Virtual Providers 4. Create another calculated measure DEV_SALES (Deviation in SALES) to compute the deviation in the sales measures SALES_T2 and SALES_T1 5. Activate the Analytical View. 4.2 Create VirtualProvider in SAP BW 1. Create a VirtualProvider in SAP BW based on the AnalyticalView created above. 2. (Optional) Add a new dimension to the VirtualProvider InputParameters. 3. Add 2 InfoObjects I_CALYR_1 and I_CALYR_2 to the VirtualProvider definition to allow mapping of Input Parameters. 4. The Attributes and Measures defined in the HANA model are mapped to corresponding BW Characteristics and Key-figures respectively. Map the two InfoObjects, I_CALYR_1 and I_CALYR_2, to the two input parameters, I_CALYEAR_1 and I_CALYEAR_2, respectively. January

11 ... How To...Consume HANA Models with Input Parameters in BW Virtual Providers 5. Activate the VirtualProvider. 4.3 Create BEx Query based on the Virtual Provider 1. Create a BEx Query based on the Virtual Provider defined above. 2. Create two Characteristic Value Variables, V_CALYEAR_1 and V_CALYEAR_2, based on the two InfoObjects, I_CALYR_1 and I_CALYR2, respectively. 3. Save the Query. January

12 How To...Consume HANA Models with Input Parameters in BW Virtual Providers 4.4 Verify the results 1. Execute the Query created above in transaction RSRT in the SAP BW system in debug mode. 2. Fill in the required values in the Variable Pop-up screen; in this case 2010 and 2011 are entered as values. 3. Notice that the values entered for the two variables are passed as placeholders down to the HANA model, implying that the Input Parameters are filled with the values supplied. January

13 How To...Consume HANA Models with Input Parameters in BW Virtual Providers 4. The HANA model is executed with the input values and result is a with year-on-year deviation in sales for the years and January

14 How To...Consume HANA Models with Input Parameters in BW Virtual Providers 4.5 Limitations Input Parameters in HANA currently support only single values. Therefore, it is only possible to use single-value BEx Variables for passing values to the HANA model Input Parameters. There is no built-in check for this in the BEx Query Designer. Hence, a mismatch might result in an error at query runtime. InfoObjects in the VirtualProvider mapped to the HANA Input Parameters should never be allowed as drill-down characteristics. This results in an error at query runtime. January

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