{"id":54919,"date":"2020-01-08T00:00:00","date_gmt":"2020-01-07T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki"},"modified":"2020-02-18T14:02:59","modified_gmt":"2020-02-18T11:02:59","slug":"vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki","title":{"rendered":"Secondo candidato per il rilascio di libmdbx v1.0 dopo cinque anni di sviluppo.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <\/p>\n<p>La libreria <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\">libmdbx<\/a> \u00e8 un discendente sostanzialmente rielaborato di LMDB, un database embedded di classe key-value altamente performante e compatto.<\/noindex><br \/>\nLa versione attuale v0.5 \u00e8 un rilascio tecnico che segna il completamento di eventuali modifiche e il passaggio alla fase di test pubblico finale e stabilizzazione, con la successiva creazione del primo rilascio completo della libreria.<\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/ru.bmstu.wiki\/LMDB_(Lightning_Memory-Mapped_Database)\">LMDB<\/a> \u00e8 un sistema di gestione di database (DBMS) embedded transazionale di classe \"key-value\" piuttosto noto basato su <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\">albero B+<\/a> senza <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\">journalizzazione preventiva<\/a>, che consente a un insieme di processi multithread di lavorare in modo concorrente e estremamente efficiente con un database locale condiviso (non di rete). A sua volta, MDBX \u00e8 pi\u00f9 veloce e affidabile di LMDB, mantenendo tutte le funzionalit\u00e0 chiave del suo predecessore, come <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/ACID\">ACID<\/a> e lettura non bloccante con scalabilit\u00e0 lineare sulle CPU, oltre ad aggiungere diverse novit\u00e0.<\/p>\n<p><\/noindex><\/p>\n<p>La descrizione delle differenze e dei miglioramenti di libmdbx rispetto a LMDB merita un articolo a parte (\u00e8 prevista la pubblicazione su \"Habr\" e \"Medium\"). Qui \u00e8 opportuno menzionare le pi\u00f9 importanti e significative:<\/p>\n<ul>\n<li>Si presta significativamente maggiore attenzione alla qualit\u00e0 del codice, al testing e alle verifiche automatiche.<\/li>\n<li>Maggiore controllo durante l'esecuzione, dalla verifica dei parametri fino all'audit interno delle strutture del database.<\/li>\n<li>Auto-compattazione e gestione automatica della dimensione del database.<\/li>\n<li>Formato unificato del database per build a 32 bit e 64 bit.<\/li>\n<li>Valutazione del volume delle query per intervalli (range query estimation).<\/li>\n<li>Supporto per chiavi di dimensioni doppie e dimensione della pagina del database selezionabile dall'utente.<\/li>\n<\/ul>\n<p>Il rilascio candidato di libmdbx \u00e8 il risultato di una decisione (vedi sotto) di separare i progetti MDBX e MithrilDB nell'agosto 2019. In questo contesto, \u00e8 stato deciso di eliminare il massimo tecnico (razionale) e stabilizzare la libreria. Di fatto, nella direzione indicata \u00e8 stato fatto da 2 a 3 volte di pi\u00f9 di quanto stimato e pianificato inizialmente:<\/p>\n<ul>\n<li>\u00c8 stata implementata la supporto per Mac OS e piattaforme di \"secondo livello\": FreeBSD, Solaris, DragonFly BSD, OpenBSD, NetBSD. Il supporto per AIX e HP-UX potrebbe essere aggiunto in caso di necessit\u00e0.<\/li>\n<li>\u00c8 stata effettuata una bonifica del codice utilizzando Undefined Behavior Sanitizer e Address Sanitizer, eliminando tutti gli avvertimenti durante la compilazione con -Wpedantic, tutti gli avvertimenti dell'analizzatore statico Coverity, ecc.<\/li>\n<li>Aggiornamento <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/blob\/master\/mdbx.h\">della descrizione API<\/a>.<\/li>\n<li>Amalgamazione del codice sorgente per facilitare l'integrazione.<\/li>\n<li>Supporto per CMake.<\/li>\n<li>Supporto per transazioni annidate.<\/li>\n<li>Utilizzo di bootid per determinare il fatto del riavvio del sistema operativo (arresto anomalo del database).<\/li>\n<li>Conteggio continuo delle pagine aggiornate\/vecchie e informazioni dettagliate sulle transazioni.<\/li>\n<li>Opzione MDBX_ACCEDE per connettersi a un database gi\u00e0 aperto in modalit\u00e0 compatibile.<\/li>\n<li>Utilizzo <a rel=\"nofollow\" href=\"https:\/\/www.gnu.org\/software\/libc\/manual\/html_node\/Open-File-Description-Locks.html\">bloccaggi OFD<\/a> se disponibili.<\/li>\n<li>Backup caldo in pipe.<\/li>\n<li>Algoritmo di ordinamento interno specializzato e ottimizzato (fino a 2-3 volte pi\u00f9 veloce di qsort() e fino al 30% pi\u00f9 veloce di std::sort()).<\/li>\n<li>Lunghezza massima della chiave aumentata.<\/li>\n<li>Controllo automatico del read ahead (strategia di caching dei file del database in memoria).<\/li>\n<li>Compattazione automatica pi\u00f9 aggressiva e veloce.<\/li>\n<li>Strategia di merging delle pagine B+ tree pi\u00f9 ottimale.<\/li>\n<li>Controllo dei file system non locali (NFS, Samba, ecc.) per prevenire danni al database in caso di uso improprio.<\/li>\n<li>Espanso il set di test.<\/li>\n<\/ul>\n<p><noindex><\/p>\n<p>Lo sviluppo della \u00abprossima\u00bb versione di libmdbx continuer\u00e0 nell'ambito di un progetto separato. <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/MithrilDB\">MithrilDB<\/a>, mentre la direzione di sviluppo della \u00abversione attuale\u00bb di MDBX \u00e8 focalizzata sulla congelazione del set di funzionalit\u00e0 e sulla stabilizzazione. Questa decisione \u00e8 stata presa per tre motivi:<\/p>\n<p><\/noindex><\/p>\n<ul>\n<li>Incompatibilit\u00e0 totale: per implementare tutte le funzionalit\u00e0 programmate in MithrilDB \u00e8 necessario un formato di file del database diverso (incompatibile) e un'API diversa (incompatibile).<\/li>\n<li>Nuovo codice sorgente: per il codice sorgente di MithrilDB \u00e8 garantita l'indipendenza di licenza da LMDB, e il progetto stesso \u00e8 previsto per la pubblicazione con un'altra licenza (approvata da <a rel=\"nofollow\" href=\"https:\/\/opensource.org\/\">OSI<\/a> licenza <a rel=\"nofollow\" href=\"https:\/\/opensource.org\/licenses\/Apache-2.0\">Apache 2.0<\/a>, e non <a rel=\"nofollow\" href=\"https:\/\/www.openldap.org\/software\/release\/license.html\">OpenLDAP Foundation<\/a>).<\/li>\n<li>La separazione consente di evitare potenziali confusioni, di apportare maggiore certezza e garantire l'autonomia delle direzioni di sviluppo dei progetti.<\/li>\n<\/ul>\n<p><noindex><\/p>\n<p>MithrilDB, come MDBX, si basa anch'esso su <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+ tree<\/a> e presenter\u00e0 anche un'eccezionale alta prestazione, eliminando al contempo una serie di difetti fondamentali di MDBX e LMDB. In particolare, sar\u00e0 risolto il problema delle \u00abletture lunghe\u00bb, manifestandosi come un \u00abgonfiore\u00bb del database a causa dell'interferenza di transazioni di lettura lunghe con la raccolta di spazzatura. Tra le nuove funzionalit\u00e0 di MithrilDB si segnala:<\/p>\n<p><\/noindex><\/p>\n<ul>\n<li>supporto per il posizionamento del database su pi\u00f9 supporti eterogenei: HDD, SSD e memoria non volatile.<\/li>\n<li>strategie ottimali per dati \"preziosi\" e \"di scarso valore\", per dati \"caldi\", \"tiepidi\" e \"freddi\".<\/li>\n<li>uso degli alberi Merkle per il controllo dell'integrit\u00e0 del database.<\/li>\n<li>uso opzionale di WAL e prestazioni significativamente superiori in scenari con scritture intensive e garanzie di integrit\u00e0 dei dati.<\/li>\n<li>registrazione pigra conforme dei dati sui dischi.<\/li>\n<\/ul>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/opensource\/15450965\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 libmdbx \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u0442\u043e\u043c\u043a\u043e\u043c LMDB \u2014 \u043f\u0440\u0435\u0434\u0435\u043b\u044c\u043d\u043e \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 v0.5 \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. LMDB \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0439 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0421\u0423\u0411\u0414 \u043a\u043b\u0430\u0441\u0441\u0430 \u00ab\u043a\u043b\u044e\u0447-\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u00bb \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0434\u0435\u0440\u0435\u0432\u0430 B+ [&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-54919","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in 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