Normalization pamusoro Databases

Muzvikwata zvisina tsarukano zvakafanana Data iri tafura zvinogona kuitwa nenzira dzakasiyana-siyana. Unhu muukama anofanira dzikarongwa maererano ndeyeukama musimboti, kureva, zvinofanira zvakazara kuderedza kuburitsa mufananidzo pamusoro data, uyewo kurerutsa nzira yavo kurapwa zvichiteverwa MASHOKO EZVAKAITIKA. Chimwe chezvinhu nematambudziko mazano Database anoita kubviswa redundancy, uye zvinoitwa normalization.

Normalization Database chinomirira chakarongwa midziyo kurambidzwa rokusika matafura unobvumira kubvisa kuburitsa mufananidzo, pamwe kusachinja-chinja kwaida Software inochengetwa mashoko, achidzikisa basa mari chokuita kuramba uye Database yokuzvigadzirisa. Normalization mashandiro ine iri chepakutanga Database matafura kupinda nyore. Padanho rimwe nerimwe izvi hazvo tafura dzakapiwa chakaipa chimiro. Danho rimwe nerimwe kunoratidzwa normalization imwe yakatarwa basa, izvo zvinofanira kutevedza pamatafura. Saka, kusukwa rinoitwa non-kiyi tafura ruzivo, inova wandisa.

Normalization pamusoro Databases inobva pfungwa dzichipfekeka vajairira pakati achinja. Zvinonzi ichaongororwa kuti mumwe chizenga ichitovimbawo mumwe, kana nguva imwe imwe ukoshi rechipiri chizenga unoenderana hapana kupfuura rimwe wokutanga ukoshi.

Normalization pamusoro Databases - Kazhinji izwi Zvisinei, unogona dziya mu akawanda kuipa siyana, izvo dzichakurukurwa pashure.

A date chinhu ichaongororwa kuhupenyu wokutanga chakaipa chimiro apo kukosha nomumwe chizenga ndiko ayo chete. Kana imwe chizenga ane nouya ukoshi, hazvigoni kunzi chinhu chomumwe yokutanga muupenyu chimiro. Zvakaratidza kuti unogona kuumba vachiri chero sangano kuti ane mashoko chinhu.

A date chinhu ari vaiona kuva inowanzotorwa chimiro chechipiri kana watova wokutanga kuipa chimiro, asi mumwe nomumwe wayo hunhu, kwete wakaumbwa munhu waunoda nenzira, yakazvimirira zvachose dzichipfekeka mashoko kubva nerimwe zvinogona kiyi.

A date chinhu anoonekwa kuva wechitatu chakaipa chimiro, kana atova ari dzose chimiro wechipiri, asi hazvina kupa chero transitive dependencies vasiri kiyi zvinhu kubva kiyi. Mukutonga transitive vajairira unonyanyozivikanwa kunzwisiswa sechinhu pachena ukama pakati minda.

Normalization Database rinoisa yokuvaka huru chinangwa kuunza ukama zvose rechitatu chakaipa chimiro. Chete nenzira iyi mune ramangwana zvichiita kuti pave vakarongeka mashoko hurongwa.

Normalization pamusoro Databases: zvinokosha mitemo

Inofanira kuronga remataurirwo kuteverwa mubasa normalization. Chokutanga ndechokuti hazvibatanidzi kudzokorora mapoka. Zvakafanira kuti kuumba yoga tafura kuchengeta neimwe iine chokuita hunhu, izvo zvinoitawo kuti yoga kiyi. Next, iva nechokwadi kuti kubvisa wandisa mashoko. Muzviitiko apo chizenga ukama iri vakachengeta chete kudivi kiyi, ipapo chinofanira kuiswa yoga tafura. Mutemo wechitatu fanira asi mbiru kuti urege kuvimba kiyi. Unhu zvinofanira kuiswa voga tafura, kana vasina zvinozoita kiyi. Iva nechokwadi kuti agopfigira kuzvimirira ukama akawanda. Muchiitiko ichi tiri kutaura pamusoro chii harioneki kongiri kubatana pakati vakawanda ukama. Pakupedzisira, zvinokosha kuti agopfigira akawanda ukama ukama semantically. In ichi Database normalization kwapera, zvichiteverwa kuwedzera kwacho.