I ezinobume imodeli data, ledatha, imodeli kunye noyilo busebenze

Umongo kunye isiseko salo naliphina ledatha le modeli yayo. It bubekwa ndawonye uluhlu lobume data kunye nemisebenzi eyenziwe phezu kwabo. I oluneqela wathenga ngokubanzi, uthungelwano kunye zonxulumelwano model data. Wonke umntu unako ukusebenzisa injongo eyenzelwe yona, njengoko okuzinziswe kwinkumbulo yekhompyutha: egcinwe isithuba kwidiski njengoko kuyimfuneko, kwaye ifakwe kwinkqubo memory. Apha processing yazo iqala. Ngamanye amazwi, le ledatha - oko kukuthi, ulwazi yehlabathi yangaphandle, uyivakalisa ngendlela ekhethekileyo, yaye iquka indlela ethile indawo isifundo. Ngokuqhelekileyo, le iimpawu ezahlukileyo, iimpawu, kunye into efanayo. Ekubeni yonke into amaqhina oqhagamshelwano ehlabathini, loo nto DB lubonakala.

Ubukhulu becala, ukuze akwazi nayiphi na kwisiseko ezaneleyo kuphela imodeli data ezinobume. Kodwa nokuma kwawo, xa kusenziwa, kwisikimu yobudlelwane kungabangela iingxaki. Kukho into ezinokunikezelwa ngendalo iinkcazo lwesemantiki iindlela, esoloko ekhona kwizifundo kuyo nayiphi inkalo.

Olu phawu kukhokelele oko yenziwe imodeli ingqiqo a ledatha. Ivumela ngaphezu enobuchwepheshe, kodwa ngaxeshanye yaye ngokusesikweni ukuchaza kwindawo ethile izifundo. Lidla scheme loo ngumzekelo a lisetyenziswa kuphela isanda wokudala ledatha. Kuba isiseko uthabathe imodeli eziphathekayo esemantiki. Ngokusekelwe kuwo, siye sungula umzobo sengqiqo, uze emva koko konke oku iguqulelwa kwaye kubonakala ekuthiwa imodeli sedata zonxulumelwano.

Kwihlabathi yoyilo, kuba kukho iindlela ezithile. Bona icace kakhulu neqondakalayo ichaza onke amanqanaba senzo xa befundisa. ulwazi lwabo ishenxisa imfuneko ukuphonononga iinkqubo ezongezelelweyo abandakanyeka nokudalwa imifuziselo yesemantiki. UMdali kwanele ukuba bazazi iziseko scheme ezikhethiweyo kwaye ukwazi imithetho main translation. Kulo mzekelo, konke kubonwe kakuhle, kwaye ukusuka ingqiqo ukufumana imodeli data ezinobume ngaphandle kobuxhakaxhaka.

Kufuneka kuqatshelwe ukuba ezinye abasunguli sedata abo basandula kuqalisa benza impazamo underestimating ukubaluleka lwesemantiki ngumzekelo schema ngesandla. Kakade ke, kweli hlabathi inkqubela lobuchwepheshe kucingwa ukuba kube senyanyeni ixesha kunye nomgudu. Kodwa lo mbono kuphosakele ngokupheleleyo. Kwaye oku ngolu hlobo lulandelayo:

1. nokumodela ngesandla ukudala inkqubo enamandla ezibonwayo kunye lwesemantiki elizayo DB. Kwaye oku kwixesha elizayo, inguqu kwinyathelo le modeli ezinobume, ukuze aphephe iimpazamo ezinzulu nokuphonononga kakhulu ngokupheleleyo uhlobo uphawu kwisifundo esithile.

2. Inyathelo kwasetyen- lwesemantiki unika amaxwebhu abalulekileyo kunokuba angafakwa ngesandla. Umzekelo, iitshathi, iitafile, kunye nezimvo. Ezipilisi ziluncedo nje kuphela kwinkqubo indalo, kodwa ekuxhatshazweni ngakumbi sedata kakade.

Kodwa ukuba intetho kuyinyaniso, ukuze kuqwalaselwe ukuba indalo kwenkqubo sengqiqo kunye lenguqu yayo emva koko kuthiwa "umfuziselo data zonxulumelwano" ngesandla - inkqubo enzima yingxaki. Khawube nomfanekiso-database apho iitafile kunye nemizobo ngaphezu kwewaka. Okulandelayo, ndicinga ukuba ayenzi ingqiqo ukuba bathethe.

inkqubo yogunyaziso ngokudala database luqala kumzobo ezi theyibhile efanayo, ukudala yomlando kwamaxwebhu zemisebenzi zeprojekthi. It lula kakhulu umsebenzi ke lowo wengcibi yokuluka, oko kunceda ekusebenziseni siseko. Kodwa elifana umhleli wokubhaliweyo oluqhelekileyo exhasa kuphela basic umyalelo igalelo, ukuhlela kunye ukuqinisekiswa. Kungokwemvelo ukuba uxolela kunye iimpawu emafini olongezelelweyo. Kwaye oku kakhulu mbono elula ayimkanga. Ngenxa yoko, inkqubo automation le onokuyi ledatha ingqiqo ibe ezinobume iqala.