{"id":119737,"date":"2024-09-09T03:43:00","date_gmt":"2024-09-09T01:43:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-vstraivaemoj-subd-libmdbx-0-13"},"modified":"2024-09-09T03:43:00","modified_gmt":"2024-09-09T01:43:00","slug":"vypusk-vstraivaemoj-subd-libmdbx-0-13","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-vstraivaemoj-subd-libmdbx-0-13","title":{"rendered":"Rilascio del database integrato libmdbx 0.13","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata pubblicata la versione della libreria libmdbx 0.13.1 (MDBX) con l'implementazione di un database embedded compatto e ad alte prestazioni di tipo chiave-valore. Il codice di libmdbx \u00e8 distribuito sotto la licenza Apache 2.0. Supporta tutti i sistemi operativi e le architetture pi\u00f9 recenti, inclusi i processori russi Elbrus 2000. Per libmdbx \u00e8 disponibile un'API avanzata per C++, insieme a binding supportati da appassionati per i linguaggi Rust, Haskell, Python, NodeJS, Ruby, Go, Nim, Deno e Scala.      <\/p>\n<p>Storicamente, libmdbx \u00e8 una profonda revisione del DBMS LMDB e supera il suo predecessore in termini di affidabilit\u00e0, funzionalit\u00e0 e prestazioni. Rispetto a LMDB, libmdbx pone grande attenzione alla qualit\u00e0 del codice, al funzionamento stabile dell'API, ai test e ai controlli automatici. Viene fornuto uno strumento di verifica dell'integrit\u00e0 della struttura del database con alcune funzionalit\u00e0 di recupero. Dal punto di vista tecnologico, libmdbx offre ACID, una rigorosa serializzazione delle modifiche e letture non bloccanti con scalabilit\u00e0 lineare in base ai core della CPU. Supporta l'autocompattazione, la gestione automatica delle dimensioni del database e la stima del volume delle query per intervallo.        <\/p>\n<p>Principali modifiche:  <\/p>\n<ul>\n<li class=\"l\"> Modifica della licenza del codice da OpenLDAP Public License a Apache 2.0.\n<li class=\"l\">  Espansione dell'API dei cursori con operazioni di posizionamento pi\u00f9 intuitive e ovvie, simili alle condizioni &lt;, =, &gt; sia per le chiavi che per le coppie chiave-valore. Sono state aggiunte le funzioni mdbx_cursor_unbind() e mdbx_txn_release_all_cursors() per una gestione flessibile dei cursori in scenari di riutilizzo al fine di ridurre le spese generali. Le funzioni mdbx_cursor_scan() e mdbx_cursor_scan_from() sono state introdotte per la scansione delle tabelle utilizzando predicati funzionali e riducendo le spese generali associate.\n<li class=\"l\"> Riprogettazione dei cursori per unificare il comportamento, rendere il codice pi\u00f9 regolare, ridurre il numero di ramificazioni e operazioni macchinistiche.\n<li class=\"l\"> Funzionalit\u00e0 della utility mdbx_chk trasferita all'interno della libreria come funzione mdbx_env_chk() per controllare l'integrit\u00e0 della struttura del database, inclusa la logica dell'applicazione.\n<li class=\"l\"> Opzione MDBX_opt_gc_time_limit per un controllo pi\u00f9 flessibile del tempo speso nella ricerca di sequenze di pagine libere adiacenti in GC.\n<li class=\"l\"> Sostanziale riduzione delle spese generali per l'avvio delle transazioni in scenari con un gran numero di manici DBI, grazie all'inizializzazione posticipata\/oziosa degli elementi delle tabelle di servizio. Include anche un meccanismo di supporto per set sparsi di manici DBI, gestito dall'opzione di compilazione MDBX_ENABLE_DBI_SPARSE, che \u00e8 abilitata per impostazione predefinita.\n<li class=\"l\"> Riduzione delle spese generali per l'apertura dei manici DBI. Include anche un meccanismo di rilascio posticipato e supporto per un'apertura rapida senza utilizzo di blocchi, gestito dall'opzione di compilazione MDBX_ENABLE_DBI_LOCKFREE, che \u00e8 abilitata per impostazione predefinita.\n<li class=\"l\"> Supporto per il \"parcheggio\" delle transazioni in lettura con la loro espulsione per la rielaborazione di vecchi snapshot MVCC e prevenzione di problemi causati dalla sospensione della rielaborazione della spazzatura. Il meccanismo di parcheggio e espulsione delle transazioni parcheggiate \u00e8 sia un complemento che un'alternativa pi\u00f9 semplice per il callback Handle-Slow-Readers. Per comodit\u00e0, le funzioni mdbx_txn_park() e mdbx_txn_unpark() hanno argomenti aggiuntivi che consentono la richiesta di \"disparcheggio\" automatico delle transazioni parcheggiate e il riavvio delle transazioni espulse. Sono state aggiunte all'utilit\u00e0 mdbx_copy le opzioni corrispondenti -d e -p.\n<li class=\"l\"> Supporto per il ripristino dell'ambiente di lavoro del database in un processo figlio dopo un fork\/splitting del processo tramite mdbx_env_resurrect_after_fork().\n<li class=\"l\"> Supporto per la rinomina delle tabelle tramite mdbx_dbi_rename() e mdbx_dbi_rename2(). Aggiunta la funzione mdbx_enumerate_tables() per ottenere informazioni sulle tabelle utente nominate.\n<li class=\"l\">  Modalit\u00e0 di operazione MDBX_NOSTICKYTHREADS invece di MDBX_NOTLS per semplificare l'integrazione con thread leggeri\/multiplexando insieme le transazioni nei thread del sistema operativo.\n<li class=\"l\"> Per l'identificazione del database \u00e8 stato aggiunto un UUID disponibile nel campo mi_dxbid della struttura MDBX_envinfo, ottenuta tramite mdbx_env_info_ex(). \u00c8 stata implementata l'ottenzione di informazioni sul database senza aprirlo tramite mdbx_preopen_snapinfo().\n<li class=\"l\"> Supporto per le funzioni di logging callback senza funzionalit\u00e0 vprintf(), facilitando notevolmente l'uso del logging in binding con altri linguaggi di programmazione.\n<li class=\"l\">  Aggiunta all'API delle funzioni mdbx_txn_copy2pathname() e mdbx_txn_copy2fd().\n<li class=\"l\"> Ristrutturazione del codice sorgente con refactoring.\n<li class=\"l\"> Utilizzo del termine \"tabella\" invece di \"subDb\".\n<li class=\"l\"> Dichiarazione obsoleta delle opzioni MDBX_COALESCE e MDBX_NOTLS. Sostituzione dell'opzione di compilazione MDBX_USE_VALGRIND con l'uso comune ENABLE_MEMCHECK.        <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61830\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 libmdbx 0.13.1 (MDBX) \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\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u043a\u043b\u0430\u0441\u0441\u0430 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