Intro2DW.pptx - Introduction to Data Warehousing MSBA 6320...

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Introduction to Data Warehousing MSBA 6320, Prof De Liu 1
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Readings: Readings Chaudhuri et. al. , An Overview of Business Intelligence Technology, Communications of the ACM, 54(8), August 2011, pp. 88-98.* Chaudhuri, Surajit, and Umeshwar Dayal. "An overview of data warehousing and OLAP technology." ACM Sigmod record 26.1 (1997): 65- 74. * Ponniah chapters 1,2,3,7* (optional) Kimball – Chapters 1 and 2* * PDFs available on course website. 2
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Agenda Need for Data Warehouse Concept of Data Warehouse Data Warehouse Architecture Data Warehousing Market 3
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Need for Decision-Optimized Data Storage Business people need information to make plans, decisions, and assess results What were sales volumes by region and product category for the last 3 years? Which of two new medications will result in the best outcomes (higher recovery rate and shorter hospital stay)? Data captured by complex operational systems (OLTPs) optimized to support well- defined transaction requirements Difficult to get needed information from data grounded in OLTPs 4 OLTP (On-Line Transactional Processing) is a class of information systems that facilitate and manage transaction-oriented applications, typically for data entry and retrieval transaction processing. (Wikipedia)
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Operational vs. Informational Data Operational (OLTP) Analytical (OLAP) Data Content Current Values Historical, derived, summarized Data Structure Optimized for transactions Optimized for complex queries Data Volume MB/GB of data GB/TB/PB… of data Access Frequency High Medium to low Access Type Read, update, delete Read-only Usage Predictable, repetitive Ad hoc, random, heuristic Response Time Sub-seconds Several seconds to minutes Users Large number; operational & data workers Relatively smaller number; data & knowledge workers 5 In computing, online analytical processing, or OLAP, is an approach to answering multi- dimensional analytical queries swiftly (Wikipedia)
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Agenda Need for Data Warehouse Concept of Data Warehouse Data Warehouse Architecture Data Warehousing Market 6
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The Concept of Data Warehouse “… a copy of transaction data specifically structured for query and analysis.” The Data Warehouse Toolkit, R. Kimball, John Wiley & Sons, February, 1996.
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