Data WarehouseOverviewSrini Rengarajan
Please muteYour cell!
Agenda      • Data Warehouse Architecture      • Approaches to build a Data Warehouse             – Top Down Approach     ...
19-08-2011   5
Today’s data warehousing defined      Data warehousing is the coordinated, architected, and      periodic copying of data ...
Data Warehouse Architecture                                                                                             Pr...
Data Warehouse Architecture      Source Layer                    Data Integration Layer      • Core Systems               ...
Data Warehouse Architecture      Data Warehouse Layer          Presentation Layer      • Staging Database            • Rep...
Data Warehouse Approaches   Top Down Approach                                          Bottom Up Approach   •    Suggested...
Data Warehouse Approaches   Top Down Approach                            Bottom Up Approach   The requirements of users ac...
How to Choose ?                            Favors Top Down                     Favors Bottom up    Nature of the    organi...
Changing Times                    Yesterday                                  Today       Point-in-time business intellige...
Hybrid Approach      The Hybrid approach aims to harness the speed of the Bottom up      approach and user orientation/int...
Data Warehouse Architecture Best Practices      • Best Practice #1             – Use a Data model that is optimized for In...
Data Warehouse Architecture Best Practices      • Best Practice #3             – Design a metadata architecture that allow...
Case Example                                      At a Glance:                                      • Indias largest priva...
Thank you foryour attention!Any Questions?
I4E DWH Architecture Srini Rengarajan, BI Head, Collabera
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I4E DWH Architecture Srini Rengarajan, BI Head, Collabera

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DWH Architecture Overview

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I4E DWH Architecture Srini Rengarajan, BI Head, Collabera

  1. 1. Data WarehouseOverviewSrini Rengarajan
  2. 2. Please muteYour cell!
  3. 3. Agenda • Data Warehouse Architecture • Approaches to build a Data Warehouse – Top Down Approach – Bottom Up Approach • Best Practices • Case Example19-08-2011 4
  4. 4. 19-08-2011 5
  5. 5. Today’s data warehousing defined Data warehousing is the coordinated, architected, and periodic copying of data from various sources, both inside and outside the enterprise, into a centralized repository optimized for reporting and analytical processing19-08-2011 6
  6. 6. Data Warehouse Architecture Presentation Source Layer Data Integration Layer Data Warehouse Layer Layer ERP BI Applications Real Time Data ProfilingOtherData Sources Data Transformation Mobile Data Data DataSocial Media Cleansing Validation AuditingContent Batch Browsers Data Quality On DemandUnstructured ServicesContent19-08-2011 7
  7. 7. Data Warehouse Architecture Source Layer Data Integration Layer • Core Systems • Extraction • Unstructured /External Data • Cleansing • Social Media • Transformation • Profiling • Auditing19-08-2011 8
  8. 8. Data Warehouse Architecture Data Warehouse Layer Presentation Layer • Staging Database • Reporting • Operational Data Store • Dashboards • Data Warehouse • Mobile Devices • Data Mart19-08-2011 9
  9. 9. Data Warehouse Approaches Top Down Approach Bottom Up Approach • Suggested by Bill Inmon • Suggested by Ralph Kimball • Build a centralized repository (DW) to house • The bottom up approach is an incremental corporate wide business data approach to build a data warehouse • The data in the DW is stored in a normalized • We build the data marts separately at different form in order to avoid redundancy points of time as and when the specific subject • Once the DW is implemented , start building area requirements are clear subject area specific data marts which contain • The data marts are integrated or combined summarized information based on the end users together to form a data warehouse analytical requirements. This is to enable faster • Separate data marts are combined through the access to the data for the end users analytics use of conformed dimensions and conformed • Longer to implement - May fail due to the lack facts. A conformed dimension and a conformed of patience and commitment fact is one that can be shared across data marts. • Faster to implement - Implementation in stages19-08-2011 10
  10. 10. Data Warehouse Approaches Top Down Approach Bottom Up Approach The requirements of users across A separate schema is built for each data different levels are gathered and one mart, taking into account the availability schema for the entire data warehouse is of data for decision-making. Later, these built. Afterwards, separate data marts schemas are merged, forming a global are tailored according to the particular schema for the entire data warehouse. characteristics of each business area or process. The bottom-up approach aims at The top-down approach emphasizes the identifying all the star schemas that can users’ requirements thus making it a be implemented using the available more user driven approach source systems making it a more source/data driven approach19-08-2011 11
  11. 11. How to Choose ? Favors Top Down Favors Bottom up Nature of the organizations Strategic Tactical decision support Requirements Data Integration Enterprise Wide integration Individual Business areas Requirements High rate of change from source Source systems are relatively Nature of Source Data systems stable Organizations requirements Need for the first data warehouse Time to Delivery allow for longer start-up time application is urgent Higher start-up costs, with lower Lower start-up costs, with each Cost to Deploy subsequent project subsequent project costing about development costs the same19-08-2011 12
  12. 12. Changing Times Yesterday Today  Point-in-time business intelligence  Real-time business intelligence  Batch data warehousing  Dynamic data warehouse environment  Separation of data warehouse and  Consolidation of data warehouse and transaction systems transaction systems  Self-contained historical data  Information integrated with other warehouse sources  Latency in development and  Speed of delivery and development is deployment of business applications critical19-08-2011 13
  13. 13. Hybrid Approach The Hybrid approach aims to harness the speed of the Bottom up approach and user orientation/integration of the Top down approach – Combination of User and Data Driven19-08-2011 14
  14. 14. Data Warehouse Architecture Best Practices • Best Practice #1 – Use a Data model that is optimized for Information retrieval • Dimensional Model • Hybrid Approach • Best Practice #2 – Carefully design the data integration processes for your DW • Ensure the data is processed efficiently and accurately • Consider an ETL or Data Cleansing tool • Use them well!19-08-2011 15
  15. 15. Data Warehouse Architecture Best Practices • Best Practice #3 – Design a metadata architecture that allows sharing of metadata between components of your DW • Consider metadata standards such as OMG’s Common Warehouse Metamodel (CWM) http://www.omg.org/technology/documents/modeling_spec_catalog.htm • Best Practice #4 – Take an approach that consolidates data into ‘a single version of the truth’ • Hybrid Model • OR ? * OMG – Object Management Group19-08-2011 16
  16. 16. Case Example At a Glance: • Indias largest private bank • Over 10 million customers • 364 branches and 46 extension counters • Network of 1,050 ATMs • Multiple call center’s and Internet banking • ICICI Bank considered various data warehousing and customer relationship management (CRM) solutions. Based on worldwide industry experience, Teradata emerged as the foremost solution • The implementation of an enterprise data warehouse from Teradata allowed ICICI to analyse its customer database, which includes information from separate operational systems including retail banking, bonds, fixed deposits, credit cards, and more • .19-08-2011 17
  17. 17. Thank you foryour attention!Any Questions?
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