deduction1. Theprocessof reasoning from one state to another, such as from cause toeffect, or from general to specific.2. Subtraction.deduplicationTheprocessof elimination of redundant copies of data from storage or during amerge of multiple datasets.default data valueAlternate form: default valueAdata valuethat is automatically assigned when no other data values areselected or applied.defectAdata valuethat does not conform to its quality requirements. SEE ALSOerror.defect preventionImproving systems to eliminate or minimize dataerrors in a database orinformation product.defect rateThe percentage of data that is incorrect, inaccurate, or no longer true. Thenumber of defects found compared to the total number ofdata values.Defense Advanced Research Projects Agency (DARPA)The U.S. federal funding source for development of the semantic web.Define-Measure-Analyze-Design-Verify (DMADV)ASix Sigmaprocess improvement method, used for projects to design andcreate new product or processes.Define-Measure-Analyze-Improve-Control (DMAIC)114
ASix Sigmaprocess improvement method, used for projects to improveexisting business processes.definition1. A statement conveying a fundamental character or the meaning of a word,phrase, or term. It is a clear, distinct, detailed statement of the precisemeaning or significance of something. (Brackett 2011)2. Theprocessof assigning names, description, and specification.degenerate dimensionSEEdimension, degenerate.degenerate fact tableSEEfact table, factless.degreeThe number of attributes (columns) in a record or relation including thosemaking up the identifier. (Everest 2010)delete1. To remove or erase.2. ASQLstatement (command) that specifies removal of data in a relationaldatabase.deliverableAn expected output or outcome from a project, function, activity, or task.Usually an information delivery product, such as a document or database.delta1. A Greek letter (Δ) signifying the difference between two statistical values.2. The term used to identify rows that have changed between time periods,used inETLprocessing.delta updateA dataset containing only the data that was updated between the last extractionor snapshot process and the current execution of the extraction or snapshot.Deming CycleThe “plan-do-check-act” cycle of continuous improvement developed by WalterShewhart and popularized by W. Edwards Deming. SEE ALSOShewhartCycle.demographicsA segment of a population delineated by certain shared inherent characteristics.demographyThe study of human populations through statistics.denormalization115
Theprocessof reversing the decomposition resulting from applying the rules ofnormalization; recombining records. (Everest 2010)dense indexSEEindex, dense.density-equalizing mapSEEchart, area cartogram.Department of Defense Architecture Framework (DODAF)An architecture framework developed by the U.S. Department of Defense in the1990s.
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