{"id":106286,"date":"2022-12-28T15:36:45","date_gmt":"2022-12-28T13:36:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predstavlena-novaya-znachitelnaya-vetka-subd-mariadb-11"},"modified":"2022-12-28T15:36:45","modified_gmt":"2022-12-28T13:36:45","slug":"predstavlena-novaya-znachitelnaya-vetka-subd-mariadb-11","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/predstavlena-novaya-znachitelnaya-vetka-subd-mariadb-11","title":{"rendered":"Predstaven\u00e1 nov\u00e1 v\u00fdznamn\u00e1 verzia datab\u00e1zov\u00e9ho syst\u00e9mu MariaDB 11","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po desiatich rokoch od zalo\u017eenia vetvy 10.x bol predstaven\u00fd vydanie DBMS MariaDB 11.0.0, ktor\u00e9 prin\u00e1\u0161a nieko\u013eko v\u00fdznamn\u00fdch zlep\u0161en\u00ed a zmien naru\u0161uj\u00facich kompatibilitu. Vetva m\u00e1 zatia\u013e kvalitu alfa vydania a bude pripraven\u00e1 na produk\u010dn\u00e9 aplik\u00e1cie po stabiliz\u00e1cii. Formovanie nasleduj\u00facej v\u00fdznamnej vetvy MariaDB 12, obsahuj\u00facej zmeny naru\u0161uj\u00face kompatibilitu, sa o\u010dak\u00e1va najsk\u00f4r o desa\u0165 rokov (v roku 2032).    <\/p>\n<p>Projekt MariaDB je odvetv\u00edm MySQL, ktor\u00e9 sa sna\u017e\u00ed zachova\u0165 sp\u00e4tn\u00fa kompatibilitu a l\u00ed\u0161i sa integr\u00e1ciou dodato\u010dn\u00fdch \u00falo\u017en\u00fdch motorov a roz\u0161\u00edren\u00fdmi mo\u017enos\u0165ami. Rozvoj MariaDB je riaden\u00fd nez\u00e1vislou organiz\u00e1ciou MariaDB Foundation v s\u00falade s otvoren\u00fdm a transparentn\u00fdm procesom v\u00fdvoja, ktor\u00fd nie je z\u00e1visl\u00fd od jednotliv\u00fdch v\u00fdrobcov. DBMS MariaDB je dod\u00e1van\u00fd namiesto MySQL v mnoh\u00fdch distrib\u00faci\u00e1ch Linuxu (RHEL, SUSE, Fedora, openSUSE, Slackware, OpenMandriva, ROSA, Arch Linux, Debian) a je implementovan\u00fd v tak\u00fdch ve\u013ek\u00fdch projektoch ako Wikipedia, Google Cloud SQL a Nimbuzz.    <\/p>\n<p>K\u013e\u00fa\u010dov\u00fdm zlep\u0161en\u00edm v vetve MariaDB 11 je prechod optimaliz\u00e1tora dopytov na nov\u00fd model n\u00e1kladov (cost model), ktor\u00fd zabezpe\u010duje presnej\u0161ie predpovedanie n\u00e1kladov na ka\u017ed\u00fd pl\u00e1n vykon\u00e1vania dopytu. Hoci nov\u00fd model umo\u017e\u0148uje eliminova\u0165 niektor\u00e9 \u00fazke miesta s v\u00fdkonom, nie je vyl\u00fa\u010den\u00e9, \u017ee nebude optim\u00e1lny vo v\u0161etk\u00fdch scen\u00e1roch, a m\u00f4\u017ee doch\u00e1dza\u0165 k spomaleniu niektor\u00fdch dopytov, preto pou\u017e\u00edvate\u013eom sa odpor\u00fa\u010da z\u00fa\u010dastni\u0165 sa testovania a informova\u0165 v\u00fdvoj\u00e1rov v pr\u00edpade v\u00fdskytu probl\u00e9mov.    <\/p>\n<p>Predch\u00e1dzaj\u00faci model bol dobre prisp\u00f4soben\u00fd na n\u00e1jdenie optim\u00e1lneho indexu, ale mal probl\u00e9my s aplikovate\u013enos\u0165ou oper\u00e1ci\u00ed skenovania tabuliek, skenovania indexov alebo v\u00fdberu pod\u013ea rozsahu. V novom modeli bola t\u00e1to nev\u00fdhoda odstr\u00e1nen\u00e1 zmenou z\u00e1kladnej v\u00e1hy oper\u00e1ci\u00ed s motorom ulo\u017eenia. Pri hodnoten\u00ed v\u00fdkonu oper\u00e1ci\u00ed z\u00e1visl\u00fdch od r\u00fdchlosti pr\u00e1ce s diskom, ako je sekven\u010dn\u00e9 skenovanie z\u00e1znamov, sa teraz predpoklad\u00e1, \u017ee d\u00e1ta s\u00fa ulo\u017een\u00e9 na SSD disku, ktor\u00fd zabezpe\u010duje r\u00fdchlos\u0165 \u010d\u00edtania na \u00farovni 400 MB za sekundu. Navy\u0161e bol optimalizovan\u00fd aj \u010fal\u0161ie v\u00e1hov\u00e9 parametre optimaliz\u00e1tora, \u010do napr\u00edklad umo\u017enilo implementova\u0165 mo\u017enos\u0165 pou\u017e\u00edvania indexov pre oper\u00e1cie \u201eORDER BY\/GROUP BY\u201c v poddotazoch a ur\u00fdchli\u0165 pr\u00e1cu s ve\u013emi mal\u00fdmi tabu\u013ekami.    <\/p>\n<p>Upozor\u0148uje sa, \u017ee nov\u00fd v\u00e1hov\u00fd model umo\u017en\u00ed vybra\u0165 optim\u00e1lnej\u0161\u00ed pl\u00e1n vykon\u00e1vania dopytu v nasleduj\u00facich situ\u00e1ci\u00e1ch:  <\/p>\n<ul>\n<li class=\"l\"> Pri pou\u017eit\u00ed dopytov, ktor\u00e9 pokr\u00fdvaj\u00fa viac ne\u017e 2 tabu\u013eky.\n<li class=\"l\"> Pri existencii indexov obsahuj\u00facich ve\u013ek\u00fd po\u010det rovnak\u00fdch hodn\u00f4t.\n<li class=\"l\"> Pri pou\u017e\u00edvan\u00ed rozsahov, ktor\u00e9 pokr\u00fdvaj\u00fa viac ne\u017e 10% tabu\u013eky.\n<li class=\"l\"> Pri existencii zlo\u017eit\u00fdch dopytov, v ktor\u00fdch nie v\u0161etky pou\u017e\u00edvan\u00e9 st\u013apce s\u00fa indexovan\u00e9.\n<li class=\"l\"> Ke\u010f sa pou\u017e\u00edvaj\u00fa dopyty, ktor\u00e9 zah\u0155\u0148aj\u00fa r\u00f4zne \u00falo\u017en\u00e9 motory (napr\u00edklad ke\u010f v jednom dopyte s\u00fa volania k tabulk\u00e1m s motormi InnoDB a Memory).\n<li class=\"l\"> Pri pou\u017e\u00edvan\u00ed FORCE INDEX na zlep\u0161enie pl\u00e1nu dopytu.\n<li class=\"l\"> Pri zhor\u0161en\u00ed pl\u00e1nu dopytu v pr\u00edpade pou\u017eitia \u201eANALYZE TABLE\u201c.\n<li class=\"l\"> Ke\u010f dopyt pokr\u00fdva ve\u013ek\u00fd po\u010det odvodnen\u00fdch tabuliek (ve\u013ek\u00fd po\u010det vnoren\u00fdch SELECT).\n<li class=\"l\"> Pri pou\u017e\u00edvan\u00ed v\u00fdrazov ORDER BY alebo GROUP BY, ktor\u00e9 spadaj\u00fa pod indexy.  <\/ul>\n<p>Hlavn\u00e9 poru\u0161enia kompatibility vo vetve MariaDB 11:  <\/p>\n<ul>\n<li class=\"l\"> Pr\u00e1va SUPER u\u017e nezabezpe\u010duj\u00fa vykon\u00e1vanie akci\u00ed, pre ktor\u00e9 s\u00fa dostupn\u00e9 samostatne vy\u017eadovan\u00e9 privil\u00e9gia. Napr\u00edklad na zmenu form\u00e1tu bin\u00e1rnych logov bud\u00fa potrebn\u00e9 pr\u00e1va BINLOG ADMIN.\n<li class=\"l\"> Implement\u00e1cia zmenov\u00e9ho buffera v InnoDB bola odstr\u00e1nen\u00e1.\n<li class=\"l\"> innodb_flush_method a innodb_file_per_table boli deklarovan\u00e9 ako zastaran\u00e9.\n<li class=\"l\"> Podpora n\u00e1zvov mysql* bola deklarovan\u00e1 ako zastaran\u00e1.\n<li class=\"l\"> Nastavovanie parametra explicit_defaults_for_timestamp na hodnotu 0 bolo ozna\u010den\u00e9 za zastaran\u00e9.\n<li class=\"l\"> Symbolick\u00e9 odkazy pre kompatibilitu s MySQL boli presunut\u00e9 do samostatn\u00e9ho bal\u00edka.\n<li class=\"l\"> Predvolen\u00e9 hodnota parametra innodb_undo_tablespaces bola zmenen\u00e1 na 3.    <\/ul>\n<\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58399\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043f\u0443\u0441\u0442\u044f 10 \u043b\u0435\u0442 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0435\u0442\u043a\u0438 10.x \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0421\u0423\u0411\u0414 MariaDB 11.0.0, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u0439 \u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439, \u043d\u0430\u0440\u0443\u0448\u0430\u044e\u0449\u0438\u0445 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c. \u0412\u0435\u0442\u043a\u0430 \u043f\u043e\u043a\u0430 \u0438\u043c\u0435\u0435\u0442 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0430\u043b\u044c\u0444\u0430-\u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u0438 \u0441\u0442\u0430\u043d\u0435\u0442 \u0433\u043e\u0442\u043e\u0432\u043e\u0439 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0430\u0446\u0438\u0438. \u0424\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 MariaDB 12, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0435\u0439 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f, \u043d\u0430\u0440\u0443\u0448\u0430\u044e\u0449\u0438\u0435 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c, \u043e\u0436\u0438\u0434\u0430\u0435\u0442\u0441\u044f \u043d\u0435 \u0440\u0430\u043d\u0435\u0435 \u0447\u0435\u043c \u0447\u0435\u0440\u0435\u0437 10 \u043b\u0435\u0442 (\u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-106286","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043f\u0443\u0441\u0442\u044f 10 \u043b\u0435\u0442 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0435\u0442\u043a\u0438 10.x 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