{"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\/hr\/blog\/administrirovanie\/proektirovanie-bazy-dannyh-luchshie-praktiki","title":{"rendered":"Projektiranje Baze Podataka. Najbolje prakse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><i>U i\u0161\u010dekivanju po\u010detka novog kruga kursa <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/3WyH\/\">\u00abBaze podataka\u00bb<\/a><\/noindex> pripremili smo mali autorski materijal s va\u017enim savjetima za konstruiranje Baze podataka. Nadamo se da \u0107e vam ovaj materijal biti koristan.<\/i><\/p>\n<p><img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/e156caa8cfe0cd43ba54ee25cba26b24.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nBaze podataka su posvuda: od najjednostavnijih blogova i direktorija do pouzdanih informati\u010dkih sustava i velikih dru\u0161tvenih mre\u017ea. Nije toliko va\u017eno je li baza podataka jednostavna ili slo\u017eena, koliko je bitno pravilno ju projektirati. Kada je baza projektirana bez promi\u0161ljanja i jasnog razumijevanja cilja, ona ne samo da nije u\u010dinkovita, ve\u0107 \u0107e daljnji rad s bazom biti stvarno mu\u010denje, neprohodna \u0161uma za korisnike. Evo nekoliko savjeta za konstruiranje baze podataka koji \u0107e pomo\u0107i u stvaranju korisnog i jednostavnog proizvoda.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>1. Odredite svrhu tablice i njezinu strukturu<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/4995cad22df7f9007891ebb135671784.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDanas takve metode razvoja kao \u0161to su Scrum ili RAD (brzi razvoj aplikacija) poma\u017eu IT timovima da brzo razvijaju baze podataka. Me\u0111utim, u potrazi za vremenom, vrlo je velika ku\u0161nja upustiti se odmah u izgradnju baze, mutno zami\u0161ljaju\u0107i koja je sama svrha, koje bi trebale biti kona\u010dne rezultate.<br \/>\n\u00a0 <br \/>\nKao da je tim usmjeren na u\u010dinkovito, br\u017ee rada, ali to je iluzija. \u0160to dublje i br\u017ee uranjate u projekt, to \u0107e vi\u0161e vremena trebati za otkrivanje i ispravak gre\u0161aka u projektu baze. <\/p>\n<p>Stoga, prvo \u0161to treba odlu\u010diti je odrediti cilj za va\u0161u bazu podataka. Za koju vrstu aplikacije se razvija baza? Ho\u0107e li korisnik samo raditi s unosima i trebate obratiti pa\u017enju na transakcije ili ga vi\u0161e zanima analitika podataka? Gdje bi baza trebala biti postavljena? Ho\u0107e li pratiti pona\u0161anje klijenata ili jednostavno upravljati odnosima me\u0111u njima?\u00a0 <\/p>\n<p>\u0160to ranije tim za projektiranje odgovori na ova pitanja, to \u0107e proces projektiranja baze podataka biti glatkiji i lak\u0161i. <\/p>\n<h3>2. Koje podatke odabrati za pohranu?<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/1079f324d621fd4916a3a47c1bda435e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPlanirajte unaprijed. Razmislite o tome \u0161to \u0107e va\u0161a web stranica ili sustav raditi u budu\u0107nosti kada projektirate bazu podataka. Va\u017eno je i\u0107i izvan jednostavnih zahtjeva tehni\u010dke specifikacije. Samo, molim vas, ne po\u010dnite odmah razmi\u0161ljati o svim mogu\u0107im vrstama podataka koje bi korisnici mogli ikada pohraniti. Bolje je razmisliti mogu li korisnici pisati objave, u\u010ditavati dokumente ili fotografije ili razmjenjivati poruke. Ako je tako, potrebno je osigurati mjesto za njih u bazi.<\/p>\n<p>Radite s timom, odjelom ili organizacijom za koju \u0107e se u budu\u0107nosti odr\u017eavati projektirana baza. Komunicirajte s ljudima razli\u010ditih razina, od stru\u010dnjaka za korisni\u010dku podr\u0161ku do voditelja odjela. Na taj \u0107ete na\u010din, uz povratne informacije, dobiti jasnu sliku o zahtjevima tvrtke.\u00a0 <\/p>\n<p>Neizbje\u017eno \u0107e potrebe korisnika \u010dak i unutar jednog odjela biti u sukobu. Ako se suo\u010dite s tim, ne bojte se osloniti na vlastito iskustvo i prona\u0107i kompromis koji \u0107e zadovoljiti sve strane i ispuniti kona\u010dni cilj baze podataka. Budite sigurni: u budu\u0107nosti \u0107ete dobiti +100500 karma i brdo kola\u010di\u0107a. <\/p>\n<h3>3. Pa\u017eljivo modelirajte podatke <\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/0def85a4c28b05b397fe789cd8b61826.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPostoji nekoliko klju\u010dnih to\u010daka na koje treba obratiti pa\u017enju prilikom modeliranja podataka. Kao \u0161to smo prije spomenuli, svrha baze podataka odre\u0111uje koje metode koristiti prilikom modeliranja. Ako projektiramo bazu podataka za operativnu obradu zapisa (OLTP), drugim rije\u010dima za njihovo stvaranje, ure\u0111ivanje i brisanje, koristimo modeliranje transakcija. Ako baza podataka treba biti relacijska, najbolje je primijeniti vi\u0161edimenzionalno modeliranje. <\/p>\n<p>Tijekom modeliranja razvijaju se konceptualni (CDM), fizi\u010dki (PDM) i logi\u010dki (LDM) modeli podataka.\u00a0 <\/p>\n<p>Konceptualni modeli opisuju entitete i vrste podataka koje oni uklju\u010duju, kao i odnose me\u0111u njima. Podijelite svoje podatke na logi\u010dne dijelove \u2014 tako \u0107e vam biti mnogo lak\u0161e. <br \/>\n<b>Klju\u010dno je prona\u0107i mjeru, nemojte pretjerivati.<\/b><\/p>\n<p>Ako je entitet te\u0161ko klasificirati jednom rije\u010di ili izrazom, tada je vrijeme za kori\u0161tenje podtipova (pod-entiteta). <\/p>\n<p>Ako entitet vodi vlastiti \u017eivot, ima atribute koji opisuju njegovo pona\u0161anje i izgled, kao i odnose s drugim objektima, mogu se slobodno koristiti ne samo podtip, ve\u0107 i supertip (roditeljski entitet).\u00a0 <\/p>\n<p>Ako se ovo pravilo zanemari, drugi programeri \u0107e se zbuniti u va\u0161em modelu i ne\u0107e u potpunosti razumjeti podatke i pravila o tome kako ih prikupiti. <\/p>\n<p>Konceptualni modeli se realiziraju putem logi\u010dkih. Ti modeli su poput mape za projektiranje fizi\u010dke baze podataka. U logi\u010dkom modelu se isti\u010du entiteti poslovnih podataka, odre\u0111uju se tipovi podataka, status klu\u010dnog pravila koje regulira odnose izme\u0111u podataka. <\/p>\n<p>Zatim se logi\u010dki model podataka uskla\u0111uje s unaprijed odabranom platformom DBMS (sustav <a href=\"https:\/\/prohoster.info\/hr\/hosting\/hosting-pgsql\/\"  data-wpil-monitor-id=\"3266\">upravljanja bazama podataka<\/a>) i dobiva se fizi\u010dki model. On opisuje na\u010din fizi\u010dkog pohranjivanja podataka. <\/p>\n<h3>4. Koristite odgovaraju\u0107e tipove podataka <\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/04d5a29f902d3eaecea1f1fd2a58cd7b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nUpotreba neodgovaraju\u0107eg tipa podataka mo\u017ee dovesti do manje to\u010dnih podataka, pote\u0161ko\u0107a u spajanju tablica, uskla\u0111ivanja atributa i pove\u0107anja veli\u010dine datoteka. <br \/>\nKako bi se osigurala cjelovitost informacija, atribut mora sadr\u017eavati samo prihvatljive tipove podataka. Ako se u bazu podataka unosi dob, osigurajte da u stupcu budu pohranjeni cjelobrojni brojevi s maksimalno 3 znamenke. <\/p>\n<p>Stvorite minimalno praznih stupaca s vrijedno\u0161\u0107u NULL. Ako sve stupce postavite kao NULL, to je velika pogre\u0161ka. Me\u0111utim, ako vam je potreban prazan stupac za provedbu specifi\u010dne poslovne funkcije, kada podaci nisu poznati ili jo\u0161 nemaju smisla, slobodno ga stvorite. Jer ne mo\u017eemo unaprijed ispuniti stupce \u201cDatum smrti\u201d ili \u201cDatum otkaza\u201d, zar ne? :-).<\/p>\n<p>Ve\u0107ina softvera za modeliranje (ER\/Studio, MySQL Workbench, SQL DBM, gliffy<code>.<\/code>com) podataka omogu\u0107ava stvaranje prototipova podru\u010dja podataka. Tako je zajam\u010deno ne samo pravilan tip podataka, logika aplikacije i dobra izvedba, ve\u0107 i obavezno postavljanje vrijednosti. <\/p>\n<h3>5. Preferirajte prirodno<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/687b40ae40c6710a35650af3d353bb82.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKada odlu\u010dujete koji stupac u tablici odabrati kao klju\u010d, uvijek obratite pa\u017enju na polja koja korisnik mo\u017ee ure\u0111ivati. Nikada ih ne odabirete kao klju\u010d \u2014 lo\u0161a ideja. Mo\u017ee se dogoditi bilo \u0161to, a vi morate jam\u010diti jedinstvenost. <\/p>\n<p>Najbolje je koristiti prirodni ili poslovni klju\u010d (natural key). To ima smisleno zna\u010denje, tako da izbjegnete dupliciranje u bazi podataka.\u00a0 <\/p>\n<p>Samo ako poslovni klju\u010d nije jedinstven (ime, prezime, pozicija) i ponavlja se u razli\u010ditim redovima tablice ili se mora mijenjati, kao primarni klju\u010d trebate odrediti generirani umjetni, surrogat klju\u010d (artificial key). <\/p>\n<h3>6. Normalizirajte umjereno<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/5ee95cb614c0ff051b37c52ade9c0d22.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKako biste u\u010dinkovito organizirali podatke u Bazi podataka, potrebno je slijediti skup preporuka i normalizirati bazu podataka. Postoji pet normalnih formi kojima treba slijediti. <br \/>\nKroz normalizaciju izbje\u0107i \u0107ete vi\u0161ak i osigurati integritet podataka koji se koriste u aplikaciji ili na web stranici. <\/p>\n<p>Kao i uvijek, svega treba biti umjereno, uklju\u010duju\u0107i i normalizaciju. Ako u Bazi podataka ima previ\u0161e tablica s istim jedinstvenim klju\u010devima, onda ste pretjerali i previ\u0161e normalizirali bazu podataka. Prekomjena normalizacije negativno utje\u010de na performanse baze podataka. <\/p>\n<h3>7. Testirajte ranije, testirajte \u010de\u0161\u0107e <\/h3>\n<p>\n<img decoding=\"async\" alt=\"Projektiranje Baze Podataka. Najbolje prakse\" src=\"\/wp-content\/uploads\/2019\/10\/4e67e171d205581a86def5da041974bf.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTestni plan i odgovaraju\u0107e testiranje trebaju biti dio dizajniranja baze podataka. <\/p>\n<p>Najbolje je testirati bazu podataka putem Continuous Integration (neprekidne integracije). Modelirajte scenarij \u201cJedan dan u \u017eivotu baze podataka\u201d i provjerite obra\u0111uju li se svi grani\u010dni slu\u010dajevi, koja su mogu\u0107a korisni\u010dka interakcija. \u0160to ranije prona\u0111ete gre\u0161ke, to \u0107ete vi\u0161e u\u0161tedjeti i vremena i novca. <\/p>\n<p>To je samo sedam savjeta koji vam mogu pomo\u0107i da dizajnirate odli\u010dnu bazu podataka po performansama i u\u010dinkovitosti. Ako ih slijedite, izbje\u0107i \u0107ete ve\u0107inu glavobolja u budu\u0107nosti. Ovi savjeti su samo vrh ledenog brijega u modeliranju baze podataka. Postoji mnogo savjeta. Kojih se vi pridr\u017eavate?<br \/>\n<br \/>Izvor: <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. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":29108,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-38806","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/proektirovanie-bazy-dannyh-luchshie-praktiki\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.4\" \/>\n\t\t<meta property=\"og:locale\" content=\"hr_HR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0411\u0430\u0437\u044b \u0414\u0430\u043d\u043d\u044b\u0445. \u041b\u0443\u0447\u0448\u0438\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0438 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\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.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/proektirovanie-bazy-dannyh-luchshie-praktiki\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2019-10-31T19:26:02+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-02-14T17:13:54+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Projektiranje Baze Podataka. 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