Friday 15 March 2019

SAP BW4/HANA Migration Analysis

What is BW/4HANA

  • SAP’s New Data warehouse
    • SAP BW/4HANA is SAP’s next generation data warehouse solution
    • It is a new product and not a successor of any SAP BW
  • Continuing BW functionalities
    • The core functionality of SAP BW is preserved and the transition to SAP BW/4HANA
    • Can be compared with the transition of SAP Business Suite to SAP S/4HANA
  • Reduce Data redundancy
    • BW/4HANA provides a simple set of objects; suited for modelling an agile and flexible layered architecture of a modern data warehouse
  • Reduced Number of Objects
    • SAP BW/4HANA drastically reduces the number of data objects hence less maintenance and storage
  • Future Roadmap
    • All future innovations will take place in SAP BW/4HANA


SAP BW/4HANA only uses state of the art object types, processes, and object types designed for use on a SAP HANA database.

Converting from SAP BW, powered by SAP HANA brings the following functional changes:
  • The SAP Business Explorer tools (SAP BEx tools) are not supported any more.
    • BEx Analyzer will not be available anymore
    • Queries are now defined in SAP BW/4HANA in the BW Modeling Tools
  • Different SAP tools can be used for reporting (additional licensing to be checked)
  • Modeling in the Data Warehousing Workbench (SAPGUI) is replaced by modeling in the BW Modeling Tools in Eclipse
  • Certain object types are not supported any more
    • These are replaced by objects types that are especially primed for use on the SAP HANA database (ex. PSAs are not available anymore)

Paths to SAP BW/4 HANA

  • New implementation or fresh start
    • New implementations are the best choice for customers converting from a legacy system or building a system from scratch with new data model only
  • Landscape transformation
    • Landscape transformation is for customers who want to consolidate and optimize their complex SAP BW landscape (multiple production systems) into a single SAP BW/4HANA system or who want to carve-out selected data models or flows into a global SAP BW/4HANA system
  • System conversion (Relevant to Customer)
    • A system conversion addresses customers who want to change their current SAP BW system into a SAP BW/4HANA system. Using the Transfer Toolbox provided by SAP, the SID of the system can be kept (in-place conversion) or a new SID can be used (remote conversion or shell conversion)

SAP BW/4HANA System Conversion

• In-Place Conversion

◈ Full system conversion of an existing SAP BW installation (keep same SID)
◈ Step-by-step in-place transfer of classic objects into their HANA-optimized counterparts
◈ Followed by a system conversion to SAP BW/4HANA
◈ Minimum start release: SAP BW 7.5 SP 5 powered by SAP HANA

SAP HANA Tutoria and Materials, SAP HANA Guides, SAP HANA Learning, SAP HANA Study Materials

• Remote Conversion

◈ Start with SAP BW/4HANA as green field installation (new SID)
◈ Support of carve-out and consolidation scenarios
◈ Transport data models and remote data transfer (including Unicode conversion)
◈ Risk mitigation due to parallel system
◈ Minimum start release: SAP BW 7.0 or higher on Any DB

SAP HANA Tutoria and Materials, SAP HANA Guides, SAP HANA Learning, SAP HANA Study Materials

• Shell Conversion

◈ Similar to Remote Conversion but without data transfer
◈ Accelerate greenfield approach by transferring and converting data models and flows
◈ Minimum start release: SAP BW 7.0 or higher on Any DB

SAP HANA Tutoria and Materials, SAP HANA Guides, SAP HANA Learning, SAP HANA Study Materials

In-place Conversion (Basic Sequence)

  • Discover / Prepare Phase
    • Check system for BW/4HANA compliance (gather information about objects and code that needs to be transferred or changed), estimate effort for the conversion project
  • Explore / Realization Phase
    • Transfer legacy objects into HANA-optimized counterparts, system conversion, post conversion tasks
SAP HANA Tutoria and Materials, SAP HANA Guides, SAP HANA Learning, SAP HANA Study Materials

• SAP BW/4HANA Transfer Cockpit
  • The SAP BW/4HANA Transfer Cockpit is the single point of entry for tools required for transitioning SAP BW systems to SAP BW/4HANA
  • Collection and Display Of Statistics Of Transfer Processes
  • Tools for Preparation Phase
    • Pre-Check Tool
    • Sizing Report
    • Code Scan Tool
    • Clean-up Reports
    • Standard Authorization Transfer –Initial Run
  • Tools for Realization Phase
    • Scope Transfer Tool
    • Standard Authorization Transfer –Delta Run
    • Deletion of Technical Content
    • Switching Operation Mode
  • Transfer Cockpit (transaction RSB4HCONV) for In-place Conversion
  • System statistics showing number and size of remaining InfoCubes and classic DataStore objects.
    • Top 10 shows, which have most records.
  • Prepare Phase includes pre-check tool, sizing report, code scan tool, clean-up reports, and initial run of authorization transfer
  • Realization Phase includes scope transfer tool, delta run of authorization transfer, and change of operation mode
• Pre-check Tool
  • Check your SAP BW system using the pre-check tool (program RS_B4HANA_CONVERSION_CONTROL)
    • Check complete system
    • Check individual transport requests
    • Display logs of previous checks

General Findings after analysis

  • Navigational Attributes are not generated when DSO/Cube are converted to Advanced DSO
    • These are permitted in Composite Providers for Reporting
    • Individual Transformations where used will require adjustments
  • x Objects are not supported any more
  • Extraction from PSA is not supported
    • PSA and Infopackages can be skipped or converted to ADSO and DTP
  • Only HANA, Flat File source and ODP systems are supported
  • Web Service Source System are not supported
  • BEx analyzer, Web Templates are not supported
  • Info Object Catalogs are not supported and to be converted to Info Area
  • Integrated Planning (BW-IP) not supported and to be converted to BPC embedded

Findings on Customer BW System

  • BEx reporting:
    • BW Queries will continue to work where BEx analyzer and Web template will not be supported
    • Adoption of Analysis Office is preferred before BW4/HANA migration
  • BW-IP
    • BW-IP has to migrate to BPC Embedded
  • Source systems
    • ECC source system connections needs to be replaced with Operational Data Provisioning (ODP) Source System
    • Alternate for Web services to be analyzed. Web Service source system not supported (2441826 – BW4SL – Web Service Source Systems)
    • No support for Hierarchy DataSources / Extractors (2480284 – BW4SL – Hierarchy DataSources). Further investigation required Need to find out alternative
    • PSA & info packages are eliminated from BW/4 objects – POC required to confirm flat file data sources are supported through DTP
  • Authorization
    • No impact on authorization as such – but all the roles and profiles have to be checked and replace the existing cube names with newly created ADSOs name if applicable

Recommendation (Customer also thinking S/4 HANA migration for ECC system)

  • SAP BW/4HANA is completely independent of S/4HANA. BW/4 HANA is not a prerequisite for S/4HANA, and vice versa.
  • All the pre-requisite activities can already start as current version of BW 7.5 sps 007 supports it for future readiness.
  • In-general SAP’s initial understanding while designing SAP S/4 HANA (2015 earlier) was that BW not required any more but this ended as not true. S/4 HANA is mainly taking out and replacing Operational Reporting from BW but need of Data Warehouse will continue to be in place
  • BW4/HANA is designed to support Big Data innovations and any future enhancement will be in BW4/HANA. Hence BW4/HANA migration should be considered
  • As S/4HANA provides operational reporting. Scope of BW would revise after S/4HANA migration hence actual BW/4 HANA conversion should be planned after S/4. Preparation can / should be started ahead and in parallel.

No comments:

Post a Comment