Amaklayenti-server ubuchwepheshe

amaklayenti-server ubuchwepheshe inikeza ezimele uxhumana izinqubo ezimbili - iseva nekhasimende, ukuxhumana phakathi kwawo ngenethiwekhi.

Amaseva abizwa ngokuthi izinqubo obhekene ukusekelwa database futhi isistimu yamafayela, futhi ikhasimende - izinqubo ukuthi uthumele isicelo bese elinda impendulo esuka kuseva.

imodeli Client-iseva isetshenziswa ekwakheni uhlelo i-information processing ngesisekelo database, kanye uhlelo leposi. Kukhona okuthiwa ifayela-iseva izakhiwo ukuthi sihluke kakhulu amaklayenti-server.

Idatha ohlelweni iseva ifayela egcinwe kwi-server ifayela (Novell NetWare noma WindowsNT Server), futhi okwenziwa ukusebenza kwe-workstations "ideskithophu semininingwane", ezifana Access, Paradox, FoxPro, njll

Database sise workstation, nedatha zokukhwabanisa eyenziwa inqubo eziningana ezimele futhi uncoordinated. ngaleyo ndlela Yonke idatha ngocansi phezu iseva network workstation, okuyinto kubambezela ijubane information processing.

amaklayenti-server ubuchwepheshe luyasetshenziswa ukusebenza izicelo ezimbili (okungenani) - amaklayenti amaseva ukuthi wabelane imisebenzi phakathi kwazo. Ukuze isitoreji futhi ukuxhaphaza ngqo leseva idatha iyaphendula, isibonelo okungaba SQLServer, Oracle, Sybase, nabanye.

I interface yomsebenzisi ihlinzeka ukwakhiwa ngokusekelwe iklayenti zazo zisebenzisa amathuluzi akhethekile noma ideskithophu egciniwe. Elinengqondo ngokucubungula idatha uyabulawa ngokwengxenye ku iklayenti, futhi ngokwengxenye kwi-server. Ukwenza isicelo kuseva wenziwa iklayenti, ngokuvamile ngolimi SQL. izicelo ezemukelwe kusetshenzwe iseva kanye iklayenti (s), umphumela ebuyiselwa.

Idatha okwenziwa endaweni efanayo lapho zigcinwa - kuseva, ngakho inani elikhulu lazo azithunyelwe yonkana inethiwekhi.

Izinzuzo izakhiwo amaklayenti-server

amaklayenti-server ubuchwepheshe kuletha imininingwane ohlelweni izinga ezifana:

• ukuthembeka

Idatha ukuguqulwa wenziwa leseva database usebenzisa indlela kuthengiselana adlulisela izakhiwo aggregate imisebenzi efana: 1) atomicity, esihlinzeka idatha ubuqotho yenkokhelo ngamunye uqeda; 2) ukuzimela zokukhokhelwa abasebenzisi ezahlukene; 3) icala ukubekezelelana - kulondolozwa imiphumela kuthengiselana.

• Scalability, okungukuthi, umthamo System akuxhomekile inombolo yabasebenzisi kanye nenani Imininingwane ngaphandle kokushintsha amasofutiwe asetshenziswa.

amaklayenti-server ubuchwepheshe isekela izinkulungwane abasebenzisi gigabytes kolwazi endaweni efanele lapho ipulatifomu yezingxenyekazi zekhompyutha.

• Ezokuphepha, okungukuthi, isivikelo idatha kusuka ukufinyelela okungagunyaziwe.
• Ukuvumelana nezimo. Ngo izinhlelo zokusebenza ezisebenza nge idatha, ukwaba izingqimba okunengqondo: interface yomsebenzisi; imithetho logic ukucutshungulwa; ukuphathwa idatha.

Njengoba sekuphawuliwe kakade, ubuchwepheshe ifayela-iseva, zonke izingqimba ezintathu ehlangana ibe isicelo esisodwa Monolithic eyehlayo on a workstation, futhi lonke ushintsho ezingqimbeni nakanjani kuyoholela ukuguqulwa isicelo, izinguqulo ezahlukahlukene iklayenti futhi iseva, futhi ufuna ukufeza ngcono isofthiwe zonke workstations .

Client-iseva ubuchwepheshe isicelo ezimbili abaphuma inikeza yonke imisebenzi ukuze kwakhiwe zokusetshenziswa ukubonwa ku iklayenti, nayo yonke imisebenzi ukuphathwa ulwazi egciniwe - kwi-server, umthetho ibhizinisi kungase nokuqalisa kokubili iseva kanye iklayenti.

-Level amathathu isicelo ivumela uhlelo ezingeni Lesisemkhatsini, okuyinto nokobana imithetho ibhizinisi, okuyizinto izakhi variable kakhulu.

Amaqophelo avumele nezimo futhi engabizi ukuzivumelanisa zokusebenza ezikhona ukuze izidingo zebhizinisi njalo Updatable.