{"id":12688,"date":"2023-04-05T15:47:21","date_gmt":"2023-04-05T13:47:21","guid":{"rendered":"https:\/\/www.websupport.sk\/blog\/?p=12688"},"modified":"2025-03-11T21:07:25","modified_gmt":"2025-03-11T20:07:25","slug":"porovnanie-mariadb-a-mysql","status":"publish","type":"post","link":"https:\/\/www.websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/","title":{"rendered":"MariaDB a MySQL: Porovnanie, v\u00fdkon, hist\u00f3ria"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><b>Doba \u010d\u00edtania:<\/b><\/span> <span class=\"rt-time\"> 6<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span>\n<p><strong>Obsah<\/strong><\/p>\n\n\n\n<p>1. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#databaza\">\u010co je to datab\u00e1za a ako funguje<\/a><\/p>\n\n\n\n<p>2. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#mysql\">\u010co je MySQL datab\u00e1za<\/a><\/p>\n\n\n\n<p>3. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#mariadb\">\u010co je MariaDB datab\u00e1za<\/a><\/p>\n\n\n\n<p>4. <a href=\"https:\/\/www.websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#mariadb-vs-mysql\">Ak\u00fd je rozdiel medzi MariaDB a MySQL?<\/a><\/p>\n\n\n\n<p>5. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#pravna-stranka\">A \u010do pr\u00e1vna str\u00e1nka?<\/a><\/p>\n\n\n\n<p>6. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#podpora\">Komer\u010dn\u00e1 podpora<\/a><\/p>\n\n\n\n<p>7. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#dokumentacia\">Dokument\u00e1cia<\/a><\/p>\n\n\n\n<p>8. <a href=\"http:\/\/websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/#zaver\">Z\u00e1ver, alebo ktor\u00fa datab\u00e1zu pou\u017ei\u0165<\/a><\/p>\n\n\n\n<p>Zdrav\u00e1 konkurencia vie prinies\u0165 ve\u013ea dobr\u00e9ho. Sta\u010d\u00ed sa pozrie\u0165 na Apple a&nbsp;Samsung. Alebo e\u0161te lep\u0161ie \u2013 Burger King vs. McDonald\u00b4s. <span class=\"s1\">?<\/span><\/p>\n\n\n\n<p>Preto sa v&nbsp;minulosti od\u010dlenila aj MariaDB od MySQL. Ako si z&nbsp;nich vybra\u0165 t\u00fa vhodnej\u0161iu?<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"databaza\">\u010co je to datab\u00e1za a ako funguje<\/h2>\n\n\n\n<p>Datab\u00e1za je usporiadan\u00e1 zbierka d\u00e1t. M\u00f4\u017ee to by\u0165 jedna tabu\u013eka alebo viac tabuliek, ale aj v&nbsp;kombin\u00e1cii s&nbsp;r\u00f4znymi \u010fal\u0161\u00edmi objektami. V&nbsp;minulosti sme poznali papierov\u00e9 datab\u00e1zy so zaklada\u010dmi. Dnes s\u00fa v&nbsp;kurze tie elektronick\u00e9 a niektor\u00e9 z nich m\u00f4\u017eu ma\u0165 tis\u00edcky r\u00f4znych d\u00e1t.<\/p>\n\n\n\n<p>Vtedy m\u00e1me v&nbsp;z\u00e1sade dve mo\u017enosti \u2013 na mana\u017ement d\u00e1t pou\u017eijeme <b>tabu\u013ekov\u00fd procesor<\/b> (typicky Excel) alebo ak je datab\u00e1za pr\u00edli\u0161 ve\u013ek\u00e1, s\u00fa tu tzv. <b>DBMS syst\u00e9my<\/b> (z anglick\u00e9ho <i>database managment system<\/i>), teda syst\u00e9m pre mana\u017ement datab\u00e1zy.<\/p>\n\n\n\n<p>DBMS pou\u017eijeme aj vtedy, ak chceme:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>jedn\u00fdm pr\u00edkazom aktualizova\u0165 cel\u00e9 zoznamy alebo \u00fadaje opravi\u0165,<\/li>\n\n\n\n<li>ako viacer\u00ed pou\u017e\u00edvatelia pracova\u0165 s&nbsp;\u00fadajmi naraz alebo<\/li>\n\n\n\n<li>\u010derpa\u0165 \u00fadaje z&nbsp;viacer\u00fdch zdrojov.<\/li>\n<\/ul>\n\n\n\n<p>DBMS umo\u017e\u0148uj\u00fa pracova\u0165 s \u00fadajmi a z t\u00fdchto \u00fadajov zis\u0165ova\u0165 inform\u00e1cie. \u0160tyri naj\u010dastej\u0161ie pr\u00edkazy pre pr\u00e1cu s datab\u00e1zou s\u00fa <span class=\"s1\">insert<\/span>, <span class=\"s1\">search<\/span>, <span class=\"s1\">update<\/span> a <span class=\"s1\">delete<\/span>.<\/p>\n\n\n\n<p>Na vykonanie t\u00fdchto pr\u00edkazov je nutn\u00e9 pou\u017ei\u0165 <b>SQL jazyk<\/b> (Structured Query Language) a v \u0148om nap\u00edsa\u0165 pr\u00edkaz. Pr\u00e1ve od tejto skratky poch\u00e1dza n\u00e1zov MySQL. N\u00e1zov MariaDB sa odv\u00e1dza priamo od datab\u00e1zy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"mysql\">\u010co je MySQL datab\u00e1za<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.mysql.com\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"s1\">MySQL<\/span><\/a> tvor\u00ed najv\u00e4\u010d\u0161iu open-source datab\u00e1zov\u00fa komunitu. MySQL (aj MariaDB) je open-source rela\u010dn\u00e1 dab\u00e1za. \u010co to znamen\u00e1?<\/p>\n\n\n\n<p>Open source znamen\u00e1, \u017ee jej zdrojov\u00fd k\u00f3d je <b>vo\u013ene pr\u00edstupn\u00fd ka\u017ed\u00e9mu<\/b>, a m\u00f4\u017ee ho upravova\u0165 pod\u013ea svojich predst\u00e1v, \u010di \u0161\u00edri\u0165 svoje distrib\u00facie \u010falej na z\u00e1klade verejnej licencie.<\/p>\n\n\n\n<p>Klasick\u00fd DMBS umo\u017e\u0148uje uchov\u00e1va\u0165 d\u00e1ta ako s\u00fabor.<b> Rela\u010dn\u00e1 datab\u00e1za<\/b> na druhej strane znamen\u00e1, \u017ee jej obsah je \u0161trukt\u00farovan\u00fd a ulo\u017een\u00fd v tabu\u013ek\u00e1ch. Ka\u017ed\u00e1 tabu\u013eka obsahuje ur\u010dit\u00fd kone\u010dn\u00fd po\u010det st\u013apcov \u2013 v nich je taktie\u017e kone\u010dn\u00fd po\u010det riadkov. Rela\u010dn\u00e1 datab\u00e1za tak eliminuje probl\u00e9m s&nbsp;uchov\u00e1van\u00edm nadbyto\u010dn\u00fdch d\u00e1t, ktor\u00fd je \u010dast\u00fd pri klasick\u00fdch DBMS.<\/p>\n\n\n\n<p>MySQL tak umo\u017e\u0148uje webov\u00fdm v\u00fdvoj\u00e1rom jednoduch\u0161ie nar\u00e1ba\u0165 s&nbsp;d\u00e1tami v&nbsp;tabu\u013ek\u00e1ch.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"207\" src=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2018\/09\/logo-mysql-300x207.png\" alt=\"Logo MySQL datab\u00e1zy\" class=\"wp-image-29366\" srcset=\"https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2018\/09\/logo-mysql-300x207.png 300w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2018\/09\/logo-mysql-768x531.png 768w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2018\/09\/logo-mysql.png 900w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"mariadb\">\u010co je MariaDB datab\u00e1za<\/h2>\n\n\n\n<p><a href=\"https:\/\/mariadb.com\" target=\"_blank\" rel=\"noopener noreferrer\">MariaDB<\/a>&nbsp;sa ako odno\u017e v minulosti od\u010dlenila od MySQL. Tak sa rozhodol jeden z b\u00fdval\u00fdch v\u00fdvoj\u00e1rov Oracle a vytvoril MariaDB na podklade MySQL. Nov\u00e9mu typu open-source rela\u010dnej datab\u00e1zy dal meno po svojej dc\u00e9re, M\u00e1rii.<\/p>\n\n\n\n<p>V&nbsp;d\u00f4sledku tohto od\u010dlenenia d\u00e1ta i defin\u00edcie tabuliek, klientske protokoly, \u0161trukt\u00fary, \u010di API (Application Programming Interface), s\u00fa 100 % kompatibiln\u00e9 s p\u00f4vodn\u00fdmi verziami MySQL, teda 5.7 a skor\u0161\u00edmi.<\/p>\n\n\n\n<p>T\u00e1to unik\u00e1tna vlastnos\u0165 zabezpe\u010duje kompatibilitu datab\u00e1z pri migr\u00e1cii z MySQL do MariaDB a sp\u00e4\u0165 bez toho, aby sme museli \u010doko\u013evek zmeni\u0165.<\/p>\n\n\n\n<p>Treba zd\u00f4razni\u0165, \u017ee MariaDB aj ostala plne open-source datab\u00e1zou. Naproti tomu MySQL u\u017e obsahuje moduly, ktor\u00fdch zdrojov\u00fd k\u00f3d nie je verejne pr\u00edstupn\u00fd (closed-source).<\/p>\n\n\n\n<p>SQL pr\u00edkazy pri t\u00fdchto dvoch typoch datab\u00e1z s\u00fa toto\u017en\u00e9.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"192\" src=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2023\/03\/mariadb-foundation-logo-300x192.jpg\" alt=\"Logo MariaDB datab\u00e1zy\" class=\"wp-image-29327\" srcset=\"https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2023\/03\/mariadb-foundation-logo-300x192.jpg 300w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2023\/03\/mariadb-foundation-logo-768x491.jpg 768w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2023\/03\/mariadb-foundation-logo.jpg 805w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"mariadb-vs-mysql\">Ak\u00fd je rozdiel medzi MariaDB a MySQL?<\/h2>\n\n\n\n<p>Po od\u010dlenen\u00ed MariaDB sa za\u010dala zdrav\u00e1 konkurencia medzi MySQL a MariaDB, ktor\u00e1 viedla k \u0161ikovn\u00fdm zlep\u0161eniam. Vzh\u013eadom na to, \u017ee MySQL je korpor\u00e1tny projekt, st\u00e1le zotrv\u00e1va v\u010faka ich financi\u00e1m ako l\u00edder v oblasti datab\u00e1z.<\/p>\n\n\n\n<p>MariaDB sa sna\u017eila \u00eds\u0165 v stop\u00e1ch MySQL aj \u010do sa t\u00fdka verzi\u00ed. Preto vznikla MariaDB 5.5, ktor\u00e1 vo svojej podstate kore\u0161pondovala s MySQL 5.7. Nieko\u013eko verzi\u00ed sa darilo udr\u017ea\u0165 tento trend, av\u0161ak pri najnov\u0161\u00edch verzi\u00e1ch u\u017e vid\u00edme rozdiely.<\/p>\n\n\n\n<p>MySQL pre\u0161la medzi verziami 5.7 a&nbsp;s\u00fa\u010dasnou verziou 8.x men\u0161\u00edm napredovan\u00edm. Niet sa \u010domu divi\u0165. Oracle toti\u017e d\u00e1va sk\u00f4r prednos\u0165 v\u00fdvoju svojich vlastn\u00fdch komer\u010dn\u00fdch produktov, ako je Oracle Database, Oracle Cloud alebo Heatwave. MySQL ako open source preto trochu zaost\u00e1va.<\/p>\n\n\n\n<p>Naopak, MariaDB, v\u010faka svojmu nepretr\u017eit\u00e9mu v\u00fdvoju, dosiahla u\u017e verziu 10.x. Obsahuje sama o sebe v\u0161etky popul\u00e1rne open source enginy (najm\u00e4 pre vyh\u013ead\u00e1vanie), niektor\u00e9 obsahuje navy\u0161e v&nbsp;porovnan\u00ed s&nbsp;MySQL. Tie\u017e m\u00e1 nieko\u013eko vylep\u0161en\u00ed v oblasti r\u00fdchlosti a za\u010dala podporova\u0165 niektor\u00e9 doplnky, ktor\u00e9 sa do MySQL in\u0161talova\u0165 nedaj\u00fa. Taktie\u017e mnoh\u00e9 dynamick\u00e9 funkcie vykon\u00e1van\u00e9 nad polo\u017ekami v tabu\u013ek\u00e1ch sa daj\u00fa vykon\u00e1va\u0165 len v MariaDB.<\/p>\n\n\n\n<p>MySQL podporuje nat\u00edvny d\u00e1tov\u00fd typ JSON a \u0161tandardne poskytuje SHA-2 autentifika\u010dn\u00fd plugin a plugin validate_password defaultne, zatia\u013e \u010do MariaDB nie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"pravna-stranka\">A \u010do pr\u00e1vna str\u00e1nka?<\/h2>\n\n\n\n<p>MariaDB je dodnes pr\u00edstupn\u00e1 na z\u00e1klade verejnej licencie (<a href=\"https:\/\/www.gnu.org\/licenses\/gpl-3.0.en.html\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\">GNU General Public License<\/span><\/a>).<\/p>\n\n\n\n<p>MySQL, vzh\u013eadom na svoje korpor\u00e1tne pozadie, je vyu\u017eite\u013en\u00e1 na z\u00e1klade dvoch r\u00f4znych licenci\u00ed \u2013 na jednej strane, na z\u00e1klade u\u017e spomenutej verejnej licencie, a&nbsp;na druhej strane aj platenej licencie hlavne pre t\u00fdch, ktor\u00fd nechc\u00fa, aby zdrojov\u00fd k\u00f3d ich produktu bol open-source.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"podpora\">Komer\u010dn\u00e1 podpora<\/h2>\n\n\n\n<p>Pri MySQL je to zrejm\u00e9. Akviz\u00edcia datab\u00e1zy firmou Oracle v&nbsp;roku 2010 pokryla aj tento aspekt a pri rie\u0161en\u00ed probl\u00e9mov odpoved\u00e1 na ot\u00e1zky priamo Oracle s jeho pracovn\u00edkmi, expertmi na tento typ datab\u00e1zy a&nbsp;jej v\u00fdvoj\u00e1ri, po\u010das cel\u00e9ho t\u00fd\u017ed\u0148a.<\/p>\n\n\n\n<p>MariaDB helpdesk sa sklad\u00e1 \u2013 ako by sa o\u010dak\u00e1valo &#8211; z expertov na oba typy datab\u00e1z. Pon\u00fakaj\u00fa taktie\u017e 24\/7 podporu a dokonca sa d\u00e1 zak\u00fapi\u0165 tzv. rie\u0161enie pre biznis, ktor\u00e9 zabezpe\u010d\u00ed okam\u017eit\u00fa pomoc pre kritick\u00e9 projekty. Zakladatelia MariaDB veria, \u017ee tak\u00fdto verejn\u00fd model je prospe\u0161n\u00fd pre v\u00fdvoj, preto\u017ee samotn\u00ed pou\u017e\u00edvatelia m\u00f4\u017eu nahra\u0165 (samozrejme po rev\u00edzii) svoje opravy do datab\u00e1zy a prispie\u0165 k vyrie\u0161eniu bezpe\u010dnostn\u00fdch probl\u00e9mov.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"dokumentacia\">Dokument\u00e1cia<\/h2>\n\n\n\n<p>Pri MySQL t\u00e1to povinnos\u0165 <a href=\"https:\/\/dev.mysql.com\/doc\/\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\">spad\u00e1 pod Oracle<\/span><\/a>. Oracle rozhoduje o&nbsp;v\u00fdvoji a&nbsp;pripravuje dokument\u00e1ciu. Na druhej strane MariaDB je mana\u017eovan\u00fd organiz\u00e1ciou MariaDB Foundation. Je preto viac otvoren\u00e1 pre \u013eud\u00ed, \u010do m\u00e1 klady aj z\u00e1pory. <a href=\"https:\/\/mariadb.com\/kb\/en\/library\/documentation\/\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\">Dokument\u00e1ciu<\/span><\/a> tvoria preva\u017ene \u013eudia z MariaDB Foundation, no ostatn\u00ed s\u00fa taktie\u017e schopn\u00ed podie\u013ea\u0165 sa na tvorbe dokument\u00e1cie, \u010di v\u00fdvoji smotnej MariaDB.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"zaver\">Z\u00e1ver, alebo ktor\u00fa datab\u00e1zu pou\u017ei\u0165<\/h2>\n\n\n\n<p>Pri rozhodovan\u00ed je potrebn\u00e9 sa v&nbsp;prvom rade pozrie\u0165 na to, pre ktor\u00fd typ datab\u00e1zy bola nap\u00edsan\u00e1 aplik\u00e1cia, ktor\u00fa chcete pou\u017ei\u0165. Ak sa stane, \u017ee aplik\u00e1cia nevy\u017eaduje pre svoj chod konkr\u00e9tny typ datab\u00e1zy, ot\u00e1zka sa vracia.<\/p>\n\n\n\n<p>Je potrebn\u00e9 zv\u00e1\u017ei\u0165 aj to, \u010di vy\u017eadujete funkcie obsiahnut\u00e9 v MySQL. Ak nie, bude zrejme vhodnej\u0161ia MariaDB, najm\u00e4 preto, lebo na z\u00e1klade jej modelu bude takmer s istotou podporovan\u00e1 e\u0161te dlh\u00fa dobu.<\/p>\n\n\n\n<p>Pri datab\u00e1ze MySQL a jej korpor\u00e1tnom modele existuje riziko e\u0161te v\u00e4\u010d\u0161ieho spomalenia v\u00fdvoja na \u00fakor ich komer\u010dnej datab\u00e1zy. Ak sa v\u00e1m p\u00e1\u010di viac korpor\u00e1tny model MySQL a d\u00f4verujete mu, zvo\u013ete t\u00fato cestu. Najm\u00e4 ak m\u00e1te z\u00e1ujem o&nbsp;ich platen\u00fa licenciu.<\/p>\n\n\n\n<p>Ak v\u0161ak ver\u00edte v silu davu spolo\u010dne tvoriaceho MariaDB, neurob\u00edte krok ved\u013ea pri zakliknut\u00ed MariaDB 10.5 ako nov\u00e9ho typu va\u0161ej datab\u00e1zy.<\/p>\n\n\n\n<p>Pre \u010fal\u0161iu pr\u00e1cu s datab\u00e1zami m\u00f4\u017eete vyu\u017ei\u0165 na\u0161u B\u00e1zu znalost\u00ed, v ktorej n\u00e1jdete <a href=\"https:\/\/www.websupport.sk\/podpora\/kb-categories\/databazy\/\" target=\"_blank\" rel=\"noreferrer noopener\">mno\u017estvo n\u00e1vodov k datab\u00e1zam<\/a>.<\/p>\n\n\n\n<p>Ktor\u00fa datab\u00e1zu pou\u017e\u00edvate vy a&nbsp;pre\u010do? Dajte n\u00e1m vedie\u0165 v&nbsp;koment\u00e1roch.<\/p>\n\n\n\n<p><em>P\u00f4vodn\u00fd \u010dl\u00e1nok o porovnan\u00ed datab\u00e1z nap\u00edsal Peter Hanzl\u00edk (20.09.2018). T\u00fato t\u00e9mu nanovo spracovala Simona Uhrinov\u00e1 a star\u00fd \u010dl\u00e1nok sme upravili.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Obsah 1. \u010co je to datab\u00e1za a ako funguje 2. \u010co je MySQL datab\u00e1za 3. \u010co je MariaDB datab\u00e1za 4. Ak\u00fd je rozdiel medzi MariaDB a MySQL? 5. A \u010do pr\u00e1vna str\u00e1nka? 6. Komer\u010dn\u00e1 podpora 7. Dokument\u00e1cia 8. Z\u00e1ver, alebo ktor\u00fa datab\u00e1zu pou\u017ei\u0165 Zdrav\u00e1 konkurencia vie prinies\u0165 ve\u013ea dobr\u00e9ho. Sta\u010d\u00ed sa pozrie\u0165 na Apple a&nbsp;Samsung. [&hellip;]<\/p>\n","protected":false},"author":59,"featured_media":29375,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,10],"tags":[186,187,188,339,1209,526,676,747],"class_list":["post-12688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","category-vzdelavanie-2","tag-databaza","tag-databazy","tag-db","tag-historia","tag-mariadb","tag-mysql","tag-porovnanie","tag-server"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MariaDB vs. MySQL: Porovnanie, v\u00fdkon, hist\u00f3ria datab\u00e1z \u2013 Websupport blog<\/title>\n<meta name=\"description\" content=\"MySQL a MariaDB: Ak\u00fd je medzi nimi rozdiel? 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