数据库管理系统外文翻译

数据库管理系统外文翻译

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时间:2018-07-10

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1、附录:英文资料及翻译英文原文:DATABASEMANAGEMENTSYSTEMSYouknowthatadataisacollectionoflogicallyrelateddataelementsthatmaybestructuredinvariouswaystomeetthemultipleprocessingandretrievalneedsoforganizationsandindividuals.there’snothingnewaboutdatabases-earlyoneswerechiseledinst-one,pennedon

2、scrolls,andwrittenonindexcards.butmowdatabasesarecommonlyrecordedonmagnetizeablemedia,andcomputerprogramsarerequiredtoperformthenecessarystorageadretrievaloperations.Thesystemsoftwarepackagethathandlesthedifficulttasksassociatedwithcreating,accessing,andmaintainingdatabasere

3、cordsisinaDBMSpackageestablishaninterfacebetweenthedatabaseitselfandtheusersofthedatabase.(theseusersmaybeapplicationsprogrammers,managersandotherswithinformationneeds,andvariousOSprograms.)ADBMScanorganize,process,andpresentselecteddataelementsfromthedatabase.thiscapability

4、enablesdecisionmakerstosearch.probe,andquerydatabasecontentsinordertoextractanswerstononrecurringandunplannedquestionsthataren’tavailableinregularreports.thesequestionsmightinitiallybevagueand/orpoorlydefined,butpeoplecan“browse”throughthedatabaseuntiltheyhavetheneededinform

5、ation.inshort,theDBMSwill“manage”thestoreddataitemsandassembletheneededitemsfromthecommondatabaseinresponsetothequeriesofthosewhoaren’tprogrammers.Inafile-orientedsystem,usersneedingspecialinformationmaycommunicatetheirneedstoaprogrammer,who,whentimepermits,willinformation.T

6、heavailabilityofaDBMS,however,offersusersamuchfasteralternativecommunicationspath(seefigure).Sequential,direct,andotherfileprocessingapproachesareusedtoorganizeandstructuredatainsinglefiles.butaDBMSisabletointegratedataelementsfromseveralfilestoanswerspecificuserinquiriesfir

7、information.ThismeansthattheDBMSisabletointegratedataelementsfromseveralfilestoanswerspecificuserinquiriesforinformation.ThismeansthattheDBMSisabletoaccessandretrievedatafromnonkeyrecordfields.Thatis,theDBMSisabletostructureandtietogetherthelogicallyrelateddatafromseverallar

8、gefiles.Logicalstructures.Identifyingtheselogicalrelationshipsisajoboftheda

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