CS701 DATA WAREHOUSE AND DATA MINING UNIT I 1.Define data warehouse? A data warehouse is a repository of multiple heterogeneous data sources organized under a unified schema at a single site to facilitate management decision making .(or)A data warehouse is a subject- oriented, time- variant and nonvolatile collection of data in support of management’s decision-making process. 2.What are operational databases? Organizations maintain large database that are updated by daily transactions are calle d operatio nal databa ses. 3.Define OLTP? If an on-line operational database systems is used for efficient retrieval, efficient storage and m anagement of large amounts of da ta, then the system is said to be on-line trans actio n processi ng. 4.Define OLAP? Data warehouse systems serves users (or) knowledge workers in the role of data analysis and dec ision-making. S uch systems can or ganize and pre sent data in various form ats. These sy stems ar e known as on -lin e analy tical pr ocess ing systems. 5.How a database design is represented in OLTP systems? Entity-relation model 6. How a database design is represented in OLAP systems? • Star schema • Snowflake schema • Fact constellation schema 7.Write short notes on multidimensional data model?
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