{"id":54906,"date":"2020-01-07T00:00:00","date_gmt":"2020-01-06T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/posle-pyati-let-razrabotki-opublikovan-vtoroj-kandidat-v-relizy-libmdbx-1-0"},"modified":"2020-02-18T14:02:58","modified_gmt":"2020-02-18T11:02:58","slug":"posle-pyati-let-razrabotki-opublikovan-vtoroj-kandidat-v-relizy-libmdbx-1-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/posle-pyati-let-razrabotki-opublikovan-vtoroj-kandidat-v-relizy-libmdbx-1-0","title":{"rendered":"\u00d6t \u00e9v fejleszt\u00e9s ut\u00e1n megjelent a libmdbx 1.0 m\u00e1sodik kiad\u00e1si jel\u00f6ltje.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/releases\">El\u00e9rhet\u0151<\/a><\/noindex> a m\u00e1sodik jel\u00f6lt a k\u00f6nyvt\u00e1r kiad\u00e1s\u00e1nak tesztel\u00e9s\u00e9re <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\">libmdbx<\/a><\/noindex> a kulcs-\u00e9rt\u00e9k oszt\u00e1ly\u00fa, nagy teljes\u00edtm\u00e9ny\u0171, kompakt be\u00e1gyazott adatb\u00e1zis megval\u00f3s\u00edt\u00e1s\u00e1val. A jelenlegi verzi\u00f3 (0.5) technikai kiad\u00e1s, amely jelzi a kieg\u00e9sz\u00edt\u00e9sek befejez\u00e9s\u00e9t \u00e9s az \u00e1tt\u00e9r\u00e9st a nyilv\u00e1nos v\u00e9gs\u0151 tesztel\u00e9si \u00e9s stabiliz\u00e1l\u00e1si f\u00e1zisra, majd a k\u00f6nyvt\u00e1r els\u0151 teljes kiad\u00e1s\u00e1nak kialak\u00edt\u00e1s\u00e1ra. A libmdbx k\u00f3dja  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/\">terjeszt\u00e9sre ker\u00fcl<\/a><\/noindex> OpenLDAP Public License licenc alatt.<\/p>\n<p>Az MDBX k\u00f6nyvt\u00e1r l\u00e9nyegesen \u00e1tdolgozott \u00e1ga <noindex><a rel=\"nofollow\" href=\"https:\/\/symas.com\/lmdb\/\">LMDB<\/a><\/noindex> \u2014 a tranzakci\u00f3s be\u00e1gyazott adatb\u00e1zis-kezel\u0151 rendszer, amely a 'kulcs-\u00e9rt\u00e9k' oszt\u00e1lyra \u00e9p\u00fcl <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/B%E2%81%BA-%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE\">B+ f\u00e1nak<\/a><\/noindex> n\u00e9lk\u00fcl <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A3%D0%BF%D1%80%D0%B5%D0%B6%D0%B4%D0%B0%D1%8E%D1%89%D0%B0%D1%8F_%D0%B6%D1%83%D1%80%D0%BD%D0%B0%D0%BB%D0%B8%D0%B7%D0%B0%D1%86%D0%B8%D1%8F\">el\u0151zetes napl\u00f3z\u00e1s<\/a><\/noindex>, amely lehet\u0151v\u00e9 teszi a t\u00f6bbsz\u00e1l\u00fa folyamatok sz\u00e1m\u00e1ra, hogy versenyk\u00e9pesen \u00e9s hat\u00e9konyan dolgozzanak a helyben megosztott (nem h\u00e1l\u00f3zati) adatb\u00e1zissal. Ezen bel\u00fcl az MDBX gyorsabb \u00e9s megb\u00edzhat\u00f3bb, mint az LMDB, mik\u00f6zben meg\u0151rzi az \u0151s\u00e9nek minden kulcsfontoss\u00e1g\u00fa lehet\u0151s\u00e9g\u00e9t, mint p\u00e9ld\u00e1ul <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/ACID\">ACID<\/a><\/noindex> \u00e9s a nem blokkol\u00f3 olvas\u00e1s line\u00e1ris sk\u00e1l\u00e1z\u00f3d\u00e1sa a CPU magok szerint.<\/p>\n<p>A legfontosabb k\u00fcl\u00f6nbs\u00e9gek az MDBX \u00e9s az LMDB k\u00f6z\u00f6tt:<\/p>\n<ul>\n<li class=\"l\"> Elvileg t\u00f6bb figyelmet ford\u00edtanak a k\u00f3d min\u0151s\u00e9g\u00e9re, tesztel\u00e9sre \u00e9s automatikus ellen\u0151rz\u00e9sekre.\n<li class=\"l\"> Jelent\u0151sen nagyobb kontroll a munka sor\u00e1n, az param\u00e9terek ellen\u0151rz\u00e9s\u00e9t\u0151l kezdve a bels\u0151 adatb\u00e1zis strukt\u00far\u00e1k audit\u00e1l\u00e1s\u00e1ig.\n<li class=\"l\"> Automatikus t\u00f6m\u00f6r\u00edt\u00e9s \u00e9s az adatb\u00e1zis m\u00e9ret\u00e9nek automatikus kezel\u00e9se.\n<li class=\"l\"> Egys\u00e9ges adatb\u00e1zis form\u00e1tum 32 bites \u00e9s 64 bites build-ekhez.\n<li class=\"l\"> K\u00e9rd\u00e9s- \u00e9s kiterjed\u00e9s szerinti becsl\u00e9s (range query estimation).\n<li class=\"l\"> A felhaszn\u00e1l\u00f3 \u00e1ltal v\u00e1laszthat\u00f3 adatb\u00e1zis m\u00e9ret k\u00e9tszeres kulcs t\u00e1mogat\u00e1sa.\n<\/ul>\n<p>A libmdbx kiadott jel\u00f6lti verzi\u00f3ja az MDBX \u00e9s a MithrilDB projektek szeptemberi sz\u00e9tv\u00e1laszt\u00e1s\u00e1r\u00f3l hozott d\u00f6nt\u00e9s eredm\u00e9nye. A libmdbx-ben \u00fagy d\u00f6nt\u00f6ttek, hogy elt\u00e1vol\u00edtj\u00e1k a (racion\u00e1lis) maxim\u00e1lis technikai ad\u00f3ss\u00e1got \u00e9s stabiliz\u00e1lj\u00e1k a k\u00f6nyvt\u00e1rat. A t\u00e9nyek szerint a megjel\u00f6lt ir\u00e1nyban 2-3-szor t\u00f6bbet val\u00f3s\u00edtottak meg, mint amit el\u0151zetesen \u00e9rt\u00e9keltek \u00e9s terveztek:<\/p>\n<ul>\n<li class=\"l\"> Megval\u00f3sult a macOS \u00e9s a \u201em\u00e1sodlagos\u201d platformok t\u00e1mogat\u00e1sa: FreeBSD, Solaris, DragonFly BSD, OpenBSD, NetBSD. Az AIX \u00e9s a HP-UX t\u00e1mogat\u00e1sa sz\u00fcks\u00e9g eset\u00e9n hozz\u00e1adhat\u00f3.\n<li class=\"l\"> A k\u00f3d karbantart\u00e1sa az Undefined Behavior Sanitizer \u00e9s az Address Sanitizer seg\u00edts\u00e9g\u00e9vel t\u00f6rt\u00e9nt, minden figyelmeztet\u00e9s megsz\u00fcntetve a \u201e-Wpedantic\u201d kapcsol\u00f3 haszn\u00e1latakor, valamint a Coverity Static Analyzer \u00f6sszes figyelmeztet\u00e9se is.\n<li class=\"l\"> Friss\u00edt\u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/blob\/master\/mdbx.h\">API le\u00edr\u00e1sa<\/a><\/noindex>.\n<li class=\"l\"> A forr\u00e1sk\u00f3d \u00f6sszevon\u00e1sa (amalg\u00e1m\u00e1ci\u00f3) a be\u00e1gyaz\u00e1s megk\u00f6nny\u00edt\u00e9s\u00e9re.\n<li class=\"l\"> CMake t\u00e1mogat\u00e1s.\n<li class=\"l\"> Be\u00e1gyazott tranzakci\u00f3k t\u00e1mogat\u00e1sa.\n<li class=\"l\"> A bootid haszn\u00e1lata az oper\u00e1ci\u00f3s rendszer \u00fajraind\u00edt\u00e1s\u00e1nak (az adatb\u00e1zis piszkos le\u00e1ll\u00edt\u00e1sa) \u00e9szlel\u00e9s\u00e9re.\n<li class=\"l\"> A friss\u00edtett\/\u00f6reg oldalak sz\u00e1m\u00edt\u00e1sa \u00e9s b\u0151v\u00edtett inform\u00e1ci\u00f3k a tranzakci\u00f3kr\u00f3l.\n<li class=\"l\"> MDBX_ACCEDE opci\u00f3 az m\u00e1r megnyitott adatb\u00e1zishoz val\u00f3 csatlakoz\u00e1shoz kompatibilis m\u00f3dban.\n<li class=\"l\"> Haszn\u00e1lat <noindex><a rel=\"nofollow\" href=\"https:\/\/www.gnu.org\/software\/libc\/manual\/html_node\/Open-File-Description-Locks.html\">OFD z\u00e1rol\u00e1sok<\/a><\/noindex> azok el\u00e9rhet\u0151s\u00e9ge eset\u00e9n.\n<li class=\"l\"> Forr\u00f3 biztons\u00e1gi ment\u00e9s pipe-on kereszt\u00fcl.\n<li class=\"l\"> Specializ\u00e1lt, optimaliz\u00e1lt bels\u0151 rendez\u00e9si algoritmus (2-3-szor gyorsabb a \u201eqsort()\u201d-n\u00e1l \u00e9s ak\u00e1r 30%-kal gyorsabb a \u201estd::sort()\u201d-n\u00e1l).\n<li class=\"l\"> N\u00f6velt kulcshossz maximum.\n<li class=\"l\"> Automatikus read ahead vez\u00e9rl\u00e9s (a DB f\u00e1jlok mem\u00f3ri\u00e1ban val\u00f3 gyors\u00edt\u00f3t\u00e1raz\u00e1si strat\u00e9gi\u00e1ja).\n<li class=\"l\"> Aggressz\u00edvebb \u00e9s gyorsabb automatikus t\u00f6m\u00f6r\u00edt\u00e9s.\n<li class=\"l\"> Optim\u00e1lisabb B+ fa lapok egyes\u00edt\u00e9si strat\u00e9gi\u00e1ja.\n<li class=\"l\"> A nem helyi f\u00e1jlrendszerek (NFS, Samba stb.) ellen\u0151rz\u00e9se a DB k\u00e1rosod\u00e1s\u00e1nak megakad\u00e1lyoz\u00e1sa \u00e9rdek\u00e9ben helytelen haszn\u00e1lat eset\u00e9n.\n<li class=\"l\"> Kib\u0151v\u00edtett tesztk\u00e9szlet.\n<\/ul>\n<p>A libmdbx \u201ek\u00f6vetkez\u0151\u201d verzi\u00f3j\u00e1nak fejleszt\u00e9se k\u00fcl\u00f6n projekt keret\u00e9ben folytat\u00f3dik. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/MithrilDB\">MithrilDB<\/a><\/noindex>, mik\u00f6zben a MDBX \u201ejelenlegi\u201d verzi\u00f3j\u00e1nak fejleszt\u00e9si ir\u00e1nyvonala a funkcionalit\u00e1s cs\u00f6kkent\u00e9s\u00e9re \u00e9s stabiliz\u00e1l\u00e1s\u00e1ra \u00f6sszpontos\u00edt. Ezt a d\u00f6nt\u00e9st h\u00e1rom ok miatt hozt\u00e1k.<\/p>\n<ul>\n<li class=\"l\"> Teljes inkompatibilit\u00e1s: a MithrilDB \u00f6sszes tervezett k\u00e9pess\u00e9g\u00e9nek megval\u00f3s\u00edt\u00e1s\u00e1hoz k\u00fcl\u00f6n (nem kompatibilis) DB f\u00e1jlform\u00e1tumra \u00e9s m\u00e1s (nem kompatibilis) API-ra van sz\u00fcks\u00e9g.\n<li class=\"l\"> \u00daj forr\u00e1sk\u00f3d: a MithrilDB forr\u00e1sk\u00f3dja biztos\u00edtja a LMDB f\u00fcggetlens\u00e9get, \u00e9s mag\u00e1t a projektet m\u00e1s (j\u00f3v\u00e1hagyott) licencek alatt tervezik k\u00f6zz\u00e9tenni. <noindex><a rel=\"nofollow\" href=\"https:\/\/opensource.org\/\">OSI<\/a><\/noindex> Apache 2.0 licenc alatt, nem pedig <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openldap.org\/software\/release\/license.html\">OpenLDAP Nyilv\u00e1nos Licenc<\/a><\/noindex>).\n<li class=\"l\"> A sz\u00e9tv\u00e1laszt\u00e1s lehet\u0151v\u00e9 teszi a potenci\u00e1lis z\u0171rzavar elker\u00fcl\u00e9s\u00e9t, egy\u00e9rtelm\u0171s\u00e9get ad \u00e9s biztos\u00edtja a projektek fejleszt\u00e9sei k\u00f6z\u00f6tti f\u00fcggetlens\u00e9get.\n<\/ul>\n<p>A MithrilDB, ak\u00e1rcsak az MDBX, szint\u00e9n a <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/B%E2%81%BA-%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE\">B+ f\u00e1ra<\/a><\/noindex> \u00e9s emellett rendk\u00edv\u00fcl magas teljes\u00edtm\u00e9nnyel fog rendelkezni, megsz\u00fcntetve egy sor alapvet\u0151 h\u00e1tr\u00e1nyt, amelyek a MDBX \u00e9s a LMDB eset\u00e9ben el\u0151fordulnak. K\u00fcl\u00f6n\u00f6sen megsz\u0171nik a \u201ehossz\u00fa olvas\u00e1sok\u201d probl\u00e9m\u00e1ja, amely a DB \u201eduzzad\u00e1sak\u00e9nt\u201d nyilv\u00e1nul meg a hossz\u00fa olvas\u00f3 tranzakci\u00f3k miatt blokkolt szem\u00e9tfeldolgoz\u00e1s miatt. A MithrilDB \u00faj lehet\u0151s\u00e9gei k\u00f6z\u00fcl \u00e9rdemes megeml\u00edteni:<\/p>\n<ul>\n<li class=\"l\"> T\u00e1mogat\u00e1s a DB t\u00f6bb elt\u00e9r\u0151 t\u00e1rol\u00f3n val\u00f3 elhelyez\u00e9s\u00e9re: HDD, SSD \u00e9s nem volatilis mem\u00f3ria.\n<li class=\"l\"> Optim\u00e1lis strat\u00e9gi\u00e1k \u201e\u00e9rt\u00e9kes\u201d \u00e9s \u201ekev\u00e9sb\u00e9 \u00e9rt\u00e9kes\u201d, \u201eforr\u00f3\u201d, \u201elangyos\u201d \u00e9s \u201ehideg\u201d adatokhoz.\n<li class=\"l\"> Merkle fae haszn\u00e1lata az adatb\u00e1zis integrit\u00e1s\u00e1nak ellen\u0151rz\u00e9s\u00e9re.\n<li class=\"l\"> Opcion\u00e1lis WAL haszn\u00e1lat \u00e9s l\u00e9nyegesen magasabb teljes\u00edtm\u00e9ny \u00edr\u00e1s-intenz\u00edv forgat\u00f3k\u00f6nyvekben, valamint adatintegrit\u00e1si garanci\u00e1k.\n<li class=\"l\"> Lusta k\u00f6vet\u0151 adatment\u00e9s a lemezekre.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52147\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0434\u043b\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0442\u043e\u0440\u043e\u0439 \u043a\u0430\u043d\u0434\u0438\u0434\u0430\u0442 \u0432 \u0440\u0435\u043b\u0438\u0437\u044b \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 libmdbx \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439, \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0439 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0431\u0430\u0437\u043e\u0439 \u0434\u0430\u043d\u043d\u044b\u0445 \u043a\u043b\u0430\u0441\u0441\u0430 \u043a\u043b\u044e\u0447-\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u0422\u0435\u043a\u0443\u0449\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f (0.5) \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u0440\u0435\u043b\u0438\u0437\u043e\u043c, \u043e\u0442\u043c\u0435\u0447\u0430\u0435\u0442 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0435 \u043a\u0430\u043a\u0438\u0445-\u043b\u0438\u0431\u043e \u0434\u043e\u0440\u0430\u0431\u043e\u0442\u043e\u043a \u0438 \u043f\u0435\u0440\u0435\u0445\u043e\u0434 \u043a \u0444\u0430\u0437\u0435 \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u043e\u0433\u043e \u0444\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0430\u0446\u0438\u0438, \u0441 \u043f\u043e\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043f\u0435\u0440\u0432\u043e\u0433\u043e \u043f\u043e\u043b\u043d\u043e\u0446\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u0435\u043b\u0438\u0437\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438. \u041a\u043e\u0434 libmdbx \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 OpenLDAP Public License. \u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 MDBX \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f 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