Technology client-server

technology client-server inika iinkqubo ezimbini ezizimeleyo zihlanganise - iseva kunye umxhasi, unxibelelwano phakathi kwabo phezu womnatha.

Aphambili ibizwa iinkqubo uxanduva lokunika inkxaso ye ledatha kunye nenkqubo ifayili, kwaye umthengi - iinkqubo ukuba uthumele isicelo kwaye elindele ukuba impendulo evela kwiseva.

imodeli umxhasi-server isetyenziswa xa kusakhiwa inkqubo yolwazi processing ngokwesiseko weenkcukacha, kwakunye inkqubo yeposi. Kukho ekuthiwa-ukwakhiwa ifayile-server eyahlukileyo ngokubalulekileyo ukusuka uhanjiselo-server.

Data kwinkqubo umncedisi ifayile egcinwe kwi server lwefayile (Novell NetWare okanye Umncedisi WindowsNT), yaye zilungiswa ngalo ukusebenza workstations "database desktop", ezifana Access, Kwezimvo, FoxPro, njl

Database sise ifenishala, kunye neenkcukacha ukusebenzisa kwenziwa yinkqubo eziliqela ezizimeleyo unganxibelelananga apha. Yonke idatha wadluliselwa ngaphezulu umncedisi zothungelwano ifenishala, leyo imenza ngesantya processing ulwazi.

technology umxhasi-server kuphunyezwa ukusebenza ezimbini (ubuncinane) izicelo - abathengi kunye neseva ezabelana imisebenzi phakathi kwabo. Ukugcinwa nokwenza ngqo yomncedisi data aphendule, umzekelo apho ingaba SQLServer, Oracle, Sybase, kunye nabanye.

I-interface yomsebenzisi inika isakhiwo olusekelwe umxhasi we ezisebenzisa izixhobo ezikhethekileyo okanye database desktop. lweenkcukacha acwangciswe esiqhutywa ngokuyinxenye phezu client, kwaye ngenxalenye kwi umncedisi. Ukwenza isicelo kumncedisi lwenziwa ngumxhasi, ngokuqhelekileyo ngolwimi SQL. izicelo ezifunyenweyo kusingathwa ngumncedisi kunye ngumxhasi (s), isiphumo ibuyiswa.

Le data zilungiswa kwi ndawo enye apho zigcinwa - kumncedisi, ngoko ke isixa esikhulu kubo Ndithunywe ngapha komsebenzi womnatha.

Izinto eziluncedo ze-Aplikheyishini client-server

technology client-server kuzisa ulwazi kwinkqubo umgangatho onjalo:

• ukuthembeka

ukuguqulwa Data lwenziwa umncedisi database usebenzisa indlela intengiselwano anika iipropati aggregate imisebenzi efana nale: 1) atomicity, enika iinkcukacha ngemali nganye ugqibezela; 2) geqe intengiselwano lwabasebenzisi ezahlukeneyo; 3) ulungiso nokunyamezelana - ukusindisa iziphumo wo yingisela.

• Scalability, ie, umthamo System ayikho ixhomekeke kwinani abasebenzisi isixa ulwazi ngaphandle ukutshintsha software esetyenzisiweyo.

technology client-server ixhasa amawaka abasebenzisi kunye gigabytes olwazi iqonga iintsimbi efanelekileyo.

• Ukhuseleko, ie, ukhuselo data oluthembekileyo oluvela kusebenziso olungavumelekanga.
• Nezimo. Xa izicelo ezisebenza data, ukubeka maleko ubhalo: ujongano lomsebenzisi; imithetho processing logic; ulawulo lwedatha.

Njengoko sele sibonile, iteknoloji ifayile-server, bobathathu Ingaphandle zidityaniswe zibe isicelo esisodwa monolithic eyehlayo phezu ifenishala, yaye lonke utshintsho kwiingcamba ngokuyimfuneko kukhokelela loyamano isicelo, iinguqulelo ezahlukeneyo umxhasi kunye neseva, kwaye ufuna ukwenza ukuphuculwa kwesoftwe kuzo zonke workstations .

technology Client-server kwisicelo tier-ezimbini inika yonke imisebenzi zokusekwa kwe ujongano lomsebenzisi kwi umxhasi, nayo yonke imisebenzi yolawulo weenkcukacha - kwi server, umthetho ishishini lingaphumeza zombini iseva kunye client.

Isicelo level-Ezintathu ivumela kwinqanaba eliphakathi, eyenza imithetho zoshishino, ezo yeendima umahluko.

kumanqanaba ohlukeneyo ukuba bhetyebhetye ze-ngempumelelo iindleko nolu izicelo ezikhoyo kwiimfuno zoshishino rhoqo updatable.