Home Technology Data redundancy

Data redundancy



Definition

Dataredundancywillhindertheintegrityofthedatainthedatabase,andwillalsocauseawasteofstoragespace.Toreducedataredundancyasmuchaspossibleisoneofthemaingoalsofdatabasedesign.Oneofthemainideasofthenormalizationtheoryofrelationalmodel(hereinafterreferredtoasNFtheory)istheprincipleofleastredundancy,thatis,thestandardizedrelationalmodelshouldhavetheleastredundancyinacertainsense.However,NFtheoryhasnostandardconceptavailable.Accordingtotheprincipleofequivalence,theremaybeseveralredundantdefinitionsunderdifferentpremisessuchasuniversalrelationassumptionornot.

Englishcomparison

redundancyof;redundancy;redundant;redundancydegree;

explanation

1,referstoaspecialemotionininterpersonalcommunicationThewayofexpressionistoconveysincereaffectionwithseeminglyredundantandirrelevantnonsense,andcausetheinteractionandreturnofemotions.Whenrelativesandfriendsmeetindailylife,knowingthattheyhaveeaten,theystillkindlyask:"Haveyoueaten?"Whentheirchildrengoout,parentswillrepeatedlywarn:"Becarefulwhencrossingthestreet."Thesebehaviorsaremanifestationsofredundancy.Duetothenarrowingofthescopeofactivitiesandtheincreaseofpsychologicalloneliness,theelderlyespeciallyhopethatacaringpersonwillnagwiththem,its...

This article is from the network, does not represent the position of this station. Please indicate the origin of reprint
TOP