A data warehouse is a very large database system that collects, summarizes and stores data from multiple remote and heterogeneous information sources. The data warehouse supports an OLAP tool for the interactive analysis of multidimensional data. The user analyst abstracts the data from various resources by using the OLAP operations. The basic objective of database is to provide and share information anywhere at any time. The banking system in many countries is reorganizing the communication through internet as the way of transaction. As technology developed new computerized decision support applications were studied. This paper provides detailed picture of how data warehouse and OLAP technology used in banking sector.
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