{"id":38806,"date":"2019-10-31T22:26:02","date_gmt":"2019-10-31T19:26:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/proektirovanie-bazy-dannyh-luchshie-praktiki\/"},"modified":"2026-02-14T19:13:54","modified_gmt":"2026-02-14T17:13:54","slug":"proektirovanie-bazy-dannyh-luchshie-praktiki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/proektirovanie-bazy-dannyh-luchshie-praktiki","title":{"rendered":"Andmebaasi projekteerimine. Parimad praktikad","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><i>Kursuse j\u00e4rgse voolu alguse eel <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/3WyH\/\">Andmebaasid<\/a><\/noindex> oleme koostanud v\u00e4ikese autoriartikli, kus on olulised n\u00e4pun\u00e4ited andmebaasi koostamiseks. Loodame, et see materjal on teile kasulik.<\/i><\/p>\n<p><img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/e156caa8cfe0cd43ba54ee25cba26b24.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmebaasid on igal pool: alates k\u00f5ige lihtsamatest blogidest ja kataloogidest kuni usaldusv\u00e4\u00e4rsete infos\u00fcsteemide ja suurte sotsiaalsete v\u00f5rgustikeni. Ei ole nii oluline, kas andmebaas on lihtne v\u00f5i keeruline, vaid kui oluline on selle \u00f5ige projekteerimine. Kui andmebaas on projekteeritud m\u00f5tlematult ja selge eesm\u00e4rgita, ei ole see mitte ainult ebaefektiivne, vaid edasine t\u00f6\u00f6 andmebaasiga on kasutajatele t\u00f5eline piin ja l\u00e4bimatu mets. Siin on m\u00f5ned n\u00e4pun\u00e4ited andmebaasi koostamiseks, mis aitavad luua kasuliku ja kasutajas\u00f5braliku toote.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>1. M\u00e4\u00e4rake, milleks tabel on ja milline on selle struktuur<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/4995cad22df7f9007891ebb135671784.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nT\u00e4na aitavad sellised arendusmeetodid nagu Scrum v\u00f5i RAD (kiire rakenduste arendus) IT-meeskondadel andmebaase kiiresti arendada. Kuid ajahimu t\u00f5ttu on v\u00e4ga suur kiusatus sukelduda otse andmebaasi ehitamisse, halvasti m\u00f5istes, mis on eesm\u00e4rk ja millised peaksid olema l\u00f5pptulemused.<br \/>\n\u00a0 <br \/>\nK\u00e4ib nagu meeskond, kes sihib efektiivset ja kiiret t\u00f6\u00f6d, kuid see on peaaegu illusioon. Mida kaugemale ja kiiremini projekti s\u00fcvenetakse, seda rohkem aega kulub vigade tuvastamiseks ja muutmiseks andmebaasi projektis. <\/p>\n<p>Seet\u00f5ttu on esimene asi, mida tuleb lahendada, m\u00e4\u00e4rata oma andmebaasi eesm\u00e4rk. Millise rakenduse jaoks andmebaas v\u00e4lja t\u00f6\u00f6tatakse? Kas kasutaja t\u00f6\u00f6tab lihtsalt kirjetega ja tuleb p\u00f6\u00f6rata t\u00e4helepanu tehingutele v\u00f5i huvitab teda rohkem andmete anal\u00fc\u00fcs? Kuidas andmebaas peab olema \u00fcles seatud? Kas see j\u00e4lgib klientide k\u00e4itumist v\u00f5i haldab lihtsalt nende vahelisi suhteid?\u00a0 <\/p>\n<p>Mida varem projekteerimismeeskond nendele k\u00fcsimustele vastab, seda sujuvam ja lihtsam on andmebaasi projekteerimisprotsess. <\/p>\n<h3>2. Millised andmed valida talletamiseks?<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/1079f324d621fd4916a3a47c1bda435e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPlaanige ette. M\u00f5elge sellele, mida tulevikus veebisait v\u00f5i s\u00fcsteem, mille jaoks andmebaas on kavandatud, teeb. Oluline on \u00fcletada tavalised tehnilise \u00fclesande n\u00f5udmised. Kuid palun, \u00e4rge alustage kohe m\u00f5tlemist k\u00f5ikidele v\u00f5imalikele andmet\u00fc\u00fcpidele, mida kasutaja kunagi salvestada v\u00f5ib. M\u00f5elge pigem sellele, kas kasutajad saavad kirjutada postitusi, \u00fcles laadida dokumente v\u00f5i fotosid v\u00f5i vahetada s\u00f5numeid. Kui jah, siis peab andmebaasis nende jaoks ruumi olema.<\/p>\n<p>T\u00f6\u00f6tage meeskonna, osakonna v\u00f5i organisatsiooniga, kelle jaoks kavandatud andmebaasi tulevikus toetatakse. Suhelge eri tasandite inimestega, alates klienditeeninduse spetsialistidest kuni osakonnajuhatajateni. Nii saad tagasiside abil selge arusaama ettev\u00f5tte n\u00f5udmistest.\u00a0 <\/p>\n<p>Kasutajate vajadused isegi \u00fche osakonna raames on paratamatult konfliktis. Kui te selle otsaga silmitsi seisate, \u00e4rge kartke toetuda oma kogemusele ja leida kompromiss, mis rahuldab k\u00f5iki osalisi ja teenib andmebaasi l\u00f5ppeesm\u00e4rki. Olge kindel: tulevikus saad +100500 karma ja m\u00e4gi k\u00fcpsiseid. <\/p>\n<h3>3. Modelleerige andmeid ettevaatlikult <\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/0def85a4c28b05b397fe789cd8b61826.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmete modelleerimisel on m\u00f5ned olulised punktid, millele tasub t\u00e4helepanu p\u00f6\u00f6rata. Nagu me varem \u00fctlesime, s\u00f5ltub andmebaasi otstarve sellest, milliseid meetodeid kasutada modelleerimisel. Kui me projekteerime andmebaasi operatiivseks kirje t\u00f6\u00f6tlemiseks (OLTP), teisis\u00f5nu nende loomiseks, redigeerimiseks ja kustutamiseks, siis kasutame tehingute modelleerimist. Kui andmebaas peab olema relatsiooniline, siis on k\u00f5ige parem rakendada mitmem\u00f5\u00f5tmelist modelleerimist. <\/p>\n<p>Modelleerimise k\u00e4igus luuakse kontseptuaalsed (CDM), f\u00fc\u00fcsilised (PDM) ja loogilised (LDM) andmemudelid.\u00a0 <\/p>\n<p>Kontseptuaalsed mudelid kirjeldavad subjekte ja andmet\u00fc\u00fcpe, mida need sisaldavad, ning nendevahelisi suhteid. Jagage oma andmed loogilisteks t\u00fckkideks \u2014 nii on elu palju lihtsam. <br \/>\n<b>Peamine on m\u00f5\u00f5t, \u00e4rge liialdage.<\/b><\/p>\n<p>Kui subjekti on v\u00e4ga raske \u00fche s\u00f5na v\u00f5i fraasiga klassifitseerida, on aeg kasutada alamtype (t\u00fctarsubjekte). <\/p>\n<p>Kui subjekt elab oma elu, omab atribuutide, mis kirjeldavad selle k\u00e4itumist ja v\u00e4limust, samuti suhteid teiste objektidega, v\u00f5ib julgelt kasutada mitte ainult alamtype, vaid ka \u00fclemtype (vanemsubjekt).\u00a0 <\/p>\n<p>Kui seda reeglit ei j\u00e4rgita, segad teised arendajad teie mudelis \u00e4ra ja nad ei saa t\u00e4ielikult aru andmetest ja reeglitest, kuidas neid koguda. <\/p>\n<p>Kontseptuaalsed mudelid viiakse ellu loogiliste mudelite kaudu. Need mudelid nagu maakaart f\u00fc\u00fcsilise andmebaasi projekteerimiseks. Loogilises mudelis tuvastatakse \u00e4riliste andmete subjektiid, m\u00e4\u00e4ratakse andmet\u00fc\u00fcbid, v\u00f5tme staatuse reeglid, mis reguleerivad andmete vahelisi suhteid. <\/p>\n<p>Seej\u00e4rel s\u00e4titakse Loogiline andmemudel valitud eelnevalt platvormi S\u00dcDB (s\u00fcsteemi <a href=\"https:\/\/prohoster.info\/et\/hosting\/hosting-pgsql\/\"  data-wpil-monitor-id=\"3266\">database management<\/a>) ja se loob f\u00fc\u00fcsilise mudeli. See kirjeldab andmete f\u00fc\u00fcsilise salvestamise viisi. <\/p>\n<h3>4. Kasutage sobivaid andmet\u00fc\u00fcpe <\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/04d5a29f902d3eaecea1f1fd2a58cd7b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVale andmet\u00fc\u00fcbi kasutamine v\u00f5ib p\u00f5hjustada v\u00e4hem t\u00e4pseid andmeid, raskusi tabelite \u00fchendamisel, atribuutide s\u00fcnkroonimisel ja suurte failide tekkimist. <br \/>\nTeabe terviklikkuse tagamiseks peab atribuut sisaldama ainult sobivaid andmet\u00fc\u00fcpe. Kui andmebaasi kantakse vanus, siis veenduge, et veerus on salvestatud maksimaalselt 3-kohalised t\u00e4isarvud. <\/p>\n<p>Looge minimaalselt t\u00fchje veerge, millel on NULL v\u00e4\u00e4rtus. Kui k\u00f5ik veerud on NULL, siis on see t\u00f5sine viga. Kui aga vajate t\u00fchja veergu konkreetse \u00e4ritegevuse funktsiooni t\u00e4itmiseks olukordades, kus andmed on teadmata v\u00f5i veel ei oma t\u00e4hendust, siis looge see julgelt. L\u00f5ppude l\u00f5puks ei saa me ette t\u00e4ita veerge 'Surma kuup\u00e4ev' v\u00f5i 'K\u00fcsimiseks kuup\u00e4ev', me ei ole ennustajad, kes plaksutavad \u00f5hku :-).<\/p>\n<p>Enamik modelleerimistarkvarasid (ER\/Studio, MySQL Workbench, SQL DBM, gliffy<code>.<\/code>andmete struktuur v\u00f5imaldab luua andmevaldkondade protot\u00fc\u00fcpe. See tagab mitte ainult \u00f5ige andmet\u00fc\u00fcbi, rakenduse loogika ja hea j\u00f5udluse, vaid ka vajalikud v\u00e4\u00e4rtuse m\u00e4\u00e4ramise. <\/p>\n<h3>5. Eelistage loomulikku<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/687b40ae40c6710a35650af3d353bb82.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOtsustades, millist tabeli veergu valida v\u00f5tmena, p\u00f6\u00f6rake alati t\u00e4helepanu, milliseid v\u00e4lju kasutaja saab redigeerida. \u00c4rge kunagi valige neid v\u00f5tmena \u2014 see on halb m\u00f5te. K\u00f5ike v\u00f5ib juhtuda, ja te peate tagama unikaalsuse. <\/p>\n<p>Parim on kasutada loomulikku, ehk \u00e4ri v\u00f5tme (natural key). See omab t\u00e4henduslikku sisu, nii v\u00e4ltite andmebaasis dubleeritust.\u00a0 <\/p>\n<p>Kui aga \u00e4ri v\u00f5ti ei ole unikaalne (nimi, perekonnanimi, amet) ja kordub erinevates tabeliridades v\u00f5i kui see peab muutuma, tuleks esmaseks v\u00f5tmiseks m\u00e4\u00e4rata genereeritud kunstlik, surrogaatv\u00f5ti (artificial key). <\/p>\n<h3>6. Normaliseerige m\u00e4\u00e4ral<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/5ee95cb614c0ff051b37c52ade9c0d22.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmete t\u00f5husaks korraldamiseks andmebaasis on vajalik j\u00e4rgida teatud soovitusi ja normaliseerida andmebaasi. On olemas viis normaalset vormi, millega tuleb arvestada. <br \/>\nNormaliseerimise abil v\u00e4ltite liigset kordumist ja tagate rakenduses v\u00f5i veebisaidil kasutatavate andmete terviklikkuse. <\/p>\n<p>Nagu alati, peab k\u00f5ike olema m\u00f5\u00f5dukalt, sealhulgas normaliseerimist. Kui andmebaasis on liiga palju tabeleid, millel on sama unikaalne v\u00f5ti, olete liialdanud ja normaliseerinud andmebaasi liialt. \u00dclem\u00e4\u00e4rane normaliseerimine m\u00f5jutab andmebaasi j\u00f5udlust negatiivselt. <\/p>\n<h3>7. Testige varakult, testige tihti <\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmebaasi projekteerimine. Parimad praktikad\" src=\"\/wp-content\/uploads\/2019\/10\/4e67e171d205581a86def5da041974bf.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTestimisplaan ja korralik testimine peavad olema andmebaasi projekteerimise osa. <\/p>\n<p>Andmebaasi on k\u00f5ige parem testida pideva integreerimise (Continuous Integration) kaudu. Modelleerige stsenaarium \"\u00dcks p\u00e4ev andmebaasi elust\" ja kontrollige, kas k\u00f5ik piirjuhtumid on hallatud ning millised kasutajate interaktsioonid on t\u00f5en\u00e4olised. Mida varem leidate vead, seda rohkem s\u00e4\u00e4state aega ja raha. <\/p>\n<p>Need on ainult seitse n\u00f5uannet, mille abil saate kujundada suurep\u00e4rase andmebaasi j\u00f5udluse ja t\u00f5hususe osas. Kui j\u00e4rgite neid, suudate v\u00e4ltida enamikku tulevikus tekkivaid peavalusid. Need n\u00f5uanded on vaid j\u00e4\u00e4m\u00e4e tipp andmebaasi modelleerimises. On tohutult palju nippe. Milliseid kasutate?<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/471016\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0440\u0435\u0434\u0434\u0432\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0440\u0442\u0430 \u043e\u0447\u0435\u0440\u0435\u0434\u043d\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430 \u043f\u043e \u043a\u0443\u0440\u0441\u0443 \u00ab\u0411\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445\u00bb \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b\u0438 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0430\u0432\u0442\u043e\u0440\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0441 \u0432\u0430\u0436\u043d\u044b\u043c\u0438 \u0441\u043e\u0432\u0435\u0442\u0430\u043c\u0438 \u043f\u043e \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044e \u0411\u0414. \u041d\u0430\u0434\u0435\u0435\u043c\u0441\u044f \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u043b\u0435\u0437\u0435\u043d \u0434\u043b\u044f \u0432\u0430\u0441. \u0411\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u043f\u043e\u0432\u0441\u044e\u0434\u0443: \u043e\u0442 \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0438\u0445 \u0431\u043b\u043e\u0433\u043e\u0432 \u0438 \u0434\u0438\u0440\u0435\u043a\u0442\u043e\u0440\u0438\u0439 \u0434\u043e \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0445 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u0438 \u043a\u0440\u0443\u043f\u043d\u044b\u0445 \u0441\u043e\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0439. \u041d\u0435 \u043d\u0430\u0441\u0442\u043e\u043b\u044c\u043a\u043e \u0432\u0430\u0436\u043d\u043e, \u043f\u0440\u043e\u0441\u0442\u0430\u044f \u0438\u043b\u0438 \u0441\u043b\u043e\u0436\u043d\u0430\u044f \u0431\u0430\u0437\u0430 \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u0441\u043f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0435\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e. 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