Lesson 1SAP BW ON HANAERP System : Integrate various systems such as FI, MM, HR for decision maker.
HANA stores data in two instances ( columns storage and row storage).Column Storage : allow to read data at very fast speed using SAP HANA.Row Storage: SAP HANA also stores a copy of data in row storages to handle insert, update, delete.Advantage: internal processing is done by database instead of Application Server.
Business Warehouse Login to BW using GUIRun RSA1 (Data Warehousing Workbench)Modelling -Info Area: is folder who organize related object together. Info Objects : is equivalent of field in BW(e.g. Customer No, Price etc).
SAP HANALogin to SAP HAN Studio Catalog: Contain different schemas which holds tables and data.Content: Modelling is done in content.Package: is used to organize different modelling objects. The main modelling objects as following. 1- Attribute View 2-Analytic View 3-Calculation View 4- Analytic Privileges 5-Procedure 6- Decision Table
In BW data is stored in multiple locations in different layers which will be used for reporting.In HANA data is loaded at catalog level and modelling is done at view level which does not have hold data physically but structure only.When we move data from ECC to SAP HANA, We bring only tables which we have report on. The imported tables will not have relationship among them. We need to create primary keys and foreign keys between tables during the modelling process. Lesson 21- Select InfoProvider in Modelling Tab of Data Warehousing Workbench. Right Click to Create Info Area.Note: Naming convention must start with Y or Z for any Object and name can be 3 to 8 character longs.
2- Create Characteristics Catalog and activate it.
2- Create Key Figure characteristics and activate it.
3- Select Characteristics info object catalog and right click to Create PROD Info Object.
4-General Tab of Info Object:
5-Business Explorer tab of Info Object:
6- Master Data/Texts
10- Activate the info object:Create New Info ObjectCreate Key FiguresRight Click on Key Figure Catalog to Create Key Figures.Step-1
Activate the Info ObjectCreate another Info Object:Activate Info Object:
When Week entities are defined as navigation attribute and they can be used as drill down or drill across as strong entities.One data target should contain maximum 5 Navigation Attribute.
Cube can have up-to 16 dimensions and three are system(Time, Unit, Data Packet) are defined. You can create 13 custom dimension only.
Limitation of Star Schema:1. Redundancy (reload for master data in every InfoCube e.g. Customer data in Sale or Account InfoCube).2. Performance due to Alphanumeric values in fact table.3. Limited analysis due to restricted to 13 custom dimension.
Extended Star Schema
Dimension Table is added to info cube which connects to SID table and it add extra join and will not improve the performance at all. You can connect Dimension table with 248 SID Tables or Master Data Tables. In addition to this 6 fields are reserved for SAP and one is key field of Dimension Table.In total you can have 3224 SID tables to InfoCube.Note: Less no of dimension are better and Dimension table size should be less than 20% fo the fact table size.
One Fact table maximum 255 columns.Reserved for Dimensions = 16Reserved for SAP = 6Remaining for Key Figure= 233