Онлине обрада

Увод

Onlineprocessingcanbedividedintoqueryprocessing,datacollectionanddistributionprocessing,andinformationstorageandforwardingprocessingaccordingtoitsfunctionsandapplicationfields.

Обрада упита

Theuserinputsinformationfromtheterminaltomakeaninquiryrequesttothesystem.Thesystemprocessesaccordingtotheuser'srequestandsendstheinquiryresultbacktothesameterminal.Thedataenteredfromtheterminalcanimmediatelymodifyoneorseveralfiles,suchasaticketreservationsystem.Thefilemodifiedintheprocessorcanbearealfileoracopyofthemainfile(mirrorfile).Themirrorfileprovidesimmediatequeryinformationduringtheday,andthemainfileismodifiedatnighttoformanewmirrorimageforthenextday.document.Fordatasecurityandsavebackupcopiesofthemasterfile,manytransactionprocessingandinteractivesystemsusethisapproach.

DatacollectionanddistributionprocessingThesystemsuccessivelycollectsdatafromtheterminalsthatgeneratethedata,storesthedataafterverification,andprocessesthemintovariousmaterials,anddistributesthenecessarydatatothedesignatedterminals.Collectionanddistributionarecarriedoutinbatchmode.

InformationstorageandforwardingprocessingTheuserinputsapieceofdatafromtheterminalandgivesanaddress,andthesystemforwardsthisdatatooneormoreotherterminals.Inordertopreventthelossofmessagesduetofailuresduringforwarding,thereceiveddataisusuallystoredfirst,andthenforwardedtootherterminals.Thismethodiswidelyusedinsystemssuchasbanktransfers,commercialsales,andinventorymanagement.

Remotebatchprocessing(seebatchprocessing)andtime-sharingprocessingareboth.Multipleonlinesystemscanbeconnectedtoformacomputernetwork,andusersinthenetworkcansharecomputerinformationresourcesscatteredinvariousregions.Eachcomputernetworkmustdetermineasetofagreementsthattheentirenetworkcomplieswith,calledaprotocol,toachievecommunicationbetweendifferenthosts,differentoperatingsystems,anddifferentuserprocesses,andtoensureremoteonlineprocessing.

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