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In computing, online analytical processing, or OLAP (/ˈoʊlæp/), is an approach to quickly answer multi-dimensional analytical (MDA) queries.[1] OLAP is part of the broader category of business intelligence, which also encompasses relational databases, report writing and data mining.[2] Typical applications of OLAP include business reporting for sales, marketing, management reporting, business process management (BPM),[3] budgeting and forecasting, financial reporting and similar areas, with new applications emerging, such as agriculture.[4]
The term OLAP was created as a slight modification of the traditional database term online transaction processing (OLTP).[5]
OLAP tools enable users to analyse multidimensional data interactively from multiple perspectives. OLAP consists of three basic analytical operations: consolidation (roll-up), drill-down, and slicing and dicing.[6]: 402–403 Consolidation involves the aggregation of data that can be accumulated and computed in one or more dimensions. For example, all sales offices are rolled up to the sales department or sales division to anticipate sales trends. By contrast, the drill-down is a technique that allows users to navigate through the details. For instance, users can view the sales by individual products that make up a region's sales. Slicing and dicing is a feature whereby users can take out (slicing) a specific set of data of the OLAP cube and view (dicing) the slices from different viewpoints. These viewpoints are sometimes called dimensions (such as looking at the same sales by salesperson, or by date, or by customer, or by product, or by region, etc.).
Databases configured for OLAP use a multidimensional data model, allowing for complex analytical and ad hoc queries with a rapid execution time.[7] They borrow aspects of navigational databases, hierarchical databases and relational databases.
OLAP is typically contrasted to OLTP (online transaction processing), which is generally characterized by much less complex queries, in a larger volume, to process transactions rather than for the purpose of business intelligence or reporting. Whereas OLAP systems are mostly optimized for read, OLTP has to process all kinds of queries (read, insert, update and delete).
^Codd E.F.; Codd S.B. & Salley C.T. (1993). "Providing OLAP (On-line Analytical Processing) to User-Analysts: An IT Mandate" (PDF). Codd & Date, Inc. Retrieved March 5, 2008.[permanent dead link]
^Deepak Pareek (2007). Business Intelligence for Telecommunications. CRC Press. pp. 294 pp. ISBN 978-0-8493-8792-0. Retrieved March 18, 2008.
^Apostolos Benisis (2010). Business Process Management:A Data Cube To Analyze Business Process Simulation Data For Decision Making. VDM Verlag Dr. Müller e.K. pp. 204 pp. ISBN 978-3-639-22216-6.
^Cite error: The named reference ahsan was invoked but never defined (see the help page).
^"OLAP Council White Paper" (PDF). OLAP Council. 1997. Retrieved March 18, 2008.
^O'Brien, J. A., & Marakas, G. M. (2009). Management information systems (9th ed.). Boston, MA: McGraw-Hill/Irwin.
^Hari Mailvaganam (2007). "Introduction to OLAP – Slice, Dice and Drill!". Data Warehousing Review. Retrieved March 18, 2008.
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