Fundamentals of Data Warehousing. Dr. Akhtar Ali School of Computing, Engineering and Information Sciences. Lecture Outline. Inmon’s Four Characteristics of a DW Subject-Oriented, Integrated, Time Variant and Non-Volatile Some Useful Definitions Issues in Data Warehousing DW Design
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Fundamentals of Data Warehousing
Dr. Akhtar Ali
School of Computing, Engineering and Information Sciences
Data is categorized and stored by business subject rather than
Data on a given subject is defined and stored once.
Subject = Customer
Data for January
Data for February
Data for March
Data is stored as a series of snapshots, each representing a
period of time.
Typically data in the data warehouse is not directly updated or deleted.
INSERT Read (e.g. SELECT)