Distributed databases

A database inoshandiswa, kana, kana zvakatumidzwa zita, dhiabhorosi rakagoverwa ibhuku re database rinosanganisira makombiyuta akawanda akabatanidzwa nehutaneti, rimwe nerimwe rinoshandisa dunhu rekushandisa. Zvose izvi zvose firmware zvinogadzira dhiyabhorosi yakafanana. Distributed databases kubva kunze inotarisa seinozivikanwa munharaunda dzedzinza, zvinyorwa zvavo zvakasiyana hazvioneki kune vashandisi. The distributed distribution system inotarisa nodes ese ye database uye inochengetedza dambudziko rekubatanidza.

Christopher Day, anonyanya kuzivikanwa nedzidziso yepasi rose ane mbiri yepasi pose, akacherechedza gumi nemaviri makuru ayo ose akaparadzirwa mazita edzimhosva anofanira kunge ane: 1) kuzvidzivirira kwepanyika, 2) kuenderera mberi kwekushanda, 3) kuzvimiririra kwechimiro, 4) kuparadzaniswa kwakasununguka, 5) kuve pachena kwekugara, 6) kushandiswa kwezvimwe zvikumbiro, 8) kuzvimiririra kubva mumidziyo, 9) kushandiswa kwekutengeswa kwemashamba, 10) kushandiswa kwemagetsi, 11) kuzvimiririra kubva pabasa rekushandisa, 12) kuzvimiririra kubva pane zvinyorwa zvakasarudzwa.

Funga nezvehuhu hukuru hunofanirwa, maererano neData, hunofanira kuva nehuwandu hwemashoko akaparadzirwa, mune zvakawanda.

Kuzvidzivirira kwepanyika kunoreva kuti node imwe neimwe inozvimiririra inochengetedza dhesiyo yayo.

Kuenderera mberi kwemabasa. Panguva ino, K. Dayt inoti kusvika kune deta kunofanira kuvimbiswa nekuenderera mberi uye pasinei nokuti nhamba ipi iyo iripo. Uyewo, haifaniri kunge yakatarisa kuti chii chinoshandiswa nebazi rekugara ikozvino.

Kuzvimirira kwe nodes. Mune nzira yakanakisisa, node dzose dzinoenzana mune kodzero uye hazvivimbi kune mumwe nemumwe. Chinyorwa chega chega chinowanikwa pane imwe nhamba inopa dhambiri kune imwe nzvimbo nzvimbo dzine kodzero dzakadaro. Zvose zvinyorwa zvinyorwa zvinogadzira dhiabhorosi zvakagoverwa ndezvokuti zvakachengetedzeka uye zvinodzivirirwa kubva kune kuwanikwa nekunze.

Kuparadzana kusina kujeka . Iyi pfuma inoda kuti mukati medu zvinyorwa zvinotsigirwa zvakagoverwa kugoverwa kwemashoko iyo chaizvoizvo inhengo imwechete.

Kuisa pachena kwekugara. Mushandisi anowana kugovera databases haafaniri kuziva chero chii pamusoro pokuti node dzipi inowanikwa inowanikwa inowanikwa.

Processing inopa zvikumbiro. Dhiyabhorosi inofanira kuendesa mibvunzo yakaparadzirwa mubvunzo mumutauro weSQL.

Kudzokorora kudarika. Pakati pese, kudzokorora ndekushandurwa kwezvinhu zvakashandurwa kubva kune imwe dhesi kusvika kune imwe. Muchirevo chemashoko aya, tinoreva kuendesa kwedhadha pakati pe nodes nenzira dzinoita kuti zviito izvi zvisingaoneki kumunhu.

Rusununguko rwezvigadzirwa zvinoreva kuti node dzedare re database dzakaparadzirwa dzinogona kuva chero yemhando yekombiyuta.

Distributed transaction processing inobatwa senzira yekuvandudza dhiabhorosi yakagoverwa uchishandisa UPDATE, DELETE, uye INSERT mirairo, iyo isingarasikirwi kutendeseka uye kusagadzikana kweruzivo rwakachengetwa mu database.

OS kusununguka zvinoreva kuti node dzedzinza dzinogona kufamba pasi pese chero sangano rekushandisa.

Kuita pachena kune imwe chete inoshandiswa nehutachiwana hunodiwa kuti iwane zvose zvezvinhu zvakadhindwa.

Kuzvidzivirira kubva kune databases. Izvi zvinokosha zvinoda kuti hurongwa hushande pamwe nezvose zvakagoverwa DBMS kubva kune vatengesi vakasiyana, kusanganisira kutsvaga nekuvandudza unyanzvi.

Sezvatinoona, tsanangudzo yeK. Data ye database yakasarudzwa inorondedzera sechimiro nehutano husina simba, inosanganisira node dzakasununguka dziri mazita edzimba. Aya maBB anochengetedza, uye akaparidzirwa DBMS kubva kune vakasiyana-siyana vanoita kuti vawane. Nodhi dzinoita ukama pakati pavo, izvo zvinodzokorora data. The topology of the database distributed is the geography of the information system and data replication flows.