{"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\/pt\/blog\/news\/vtoroj-kandidat-v-relizy-libmdbx-v1-0-posle-pyati-let-razrabotki","title":{"rendered":"O segundo candidato a lan\u00e7amentos do libmdbx v1.0 ap\u00f3s cinco anos de desenvolvimento.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <\/p>\n<p>A biblioteca <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\">libmdbx<\/a> \u00e9 um descendente significativamente reestruturado do LMDB \u2014 um banco de dados embutido de chave-valor altamente eficiente e compacto.<\/noindex><br \/>\nA vers\u00e3o atual v0.5 \u00e9 um lan\u00e7amento t\u00e9cnico, marcando a conclus\u00e3o de quaisquer melhorias e a transi\u00e7\u00e3o para a fase de teste final p\u00fablico e estabiliza\u00e7\u00e3o, seguida pela forma\u00e7\u00e3o do primeiro lan\u00e7amento completo da biblioteca.<\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/ru.bmstu.wiki\/LMDB_(Lightning_Memory-Mapped_Database)\">LMDB<\/a> \u00e9 um SGBD embutido transacional bastante conhecido do tipo \"chave-valor\" baseado em <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\">\u00e1rvore B+<\/a> sem <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\">journaling antecipado<\/a>, que permite a execu\u00e7\u00e3o concorrente e extremamente eficiente de processos de m\u00faltiplos threads com uma base de dados localmente compartilhada (n\u00e3o em rede). Por sua vez, o MDBX \u00e9 mais r\u00e1pido e confi\u00e1vel que o LMDB, mantendo todas as capacidades-chave de seu ancestral, como <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/ACID\">ACID<\/a> e leitura n\u00e3o bloqueante com escalabilidade linear em rela\u00e7\u00e3o aos n\u00facleos da CPU, al\u00e9m de adicionar v\u00e1rias novas funcionalidades.<\/p>\n<p><\/noindex><\/p>\n<p>A descri\u00e7\u00e3o das diferen\u00e7as e melhorias do libmdbx em rela\u00e7\u00e3o ao LMDB merece um artigo separado (publica\u00e7\u00f5es planejadas no \"Habr\" e no \"Medium\"). Aqui, vale mencionar as mais importantes e not\u00e1veis:<\/p>\n<ul>\n<li>Um foco consider\u00e1vel \u00e9 dado \u00e0 qualidade do c\u00f3digo, testes e verifica\u00e7\u00f5es autom\u00e1ticas.<\/li>\n<li>Controle significativamente maior durante a opera\u00e7\u00e3o, desde a verifica\u00e7\u00e3o de par\u00e2metros at\u00e9 a auditoria interna das estruturas do banco de dados.<\/li>\n<li>Compacta\u00e7\u00e3o autom\u00e1tica e gerenciamento autom\u00e1tico do tamanho do BD.<\/li>\n<li>Formato \u00fanico do BD para compila\u00e7\u00f5es de 32 e 64 bits.<\/li>\n<li>Avalia\u00e7\u00e3o do volume de amostras por intervalos (estimativa de consultas de intervalo).<\/li>\n<li>Suporte a chaves que s\u00e3o o dobro do tamanho e tamanho da p\u00e1gina do banco de dados selecionado pelo usu\u00e1rio.<\/li>\n<\/ul>\n<p>O lan\u00e7amento do candidato libmdbx \u00e9 o resultado da decis\u00e3o (veja a seguir) de separar os projetos MDBX e MithrilDB em agosto de 2019. Ao mesmo tempo, foi decidido no libmdbx eliminar (racionalmente) o m\u00e1ximo de d\u00edvida t\u00e9cnica e estabilizar a biblioteca. Na pr\u00e1tica, foi feito de 2 a 3 vezes mais do que foi estimado e planejado inicialmente:<\/p>\n<ul>\n<li>Implementada a compatibilidade com Mac OS e plataformas de \"segunda linha\": FreeBSD, Solaris, DragonFly BSD, OpenBSD, NetBSD. A compatibilidade com AIX e HP-UX pode ser adicionada se necess\u00e1rio.<\/li>\n<li>O c\u00f3digo foi sanado com o uso do Undefined Behavior Sanitizer e do Address Sanitizer, eliminados todos os avisos ao compilar com -Wpedantic, al\u00e9m de todos os avisos do Coverity Static Analyzer, etc.<\/li>\n<li>Atualiza\u00e7\u00e3o <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/libmdbx\/blob\/master\/mdbx.h\">da descri\u00e7\u00e3o da API<\/a>.<\/li>\n<li>Am\u00e1lgama do c\u00f3digo-fonte para facilitar a incorpora\u00e7\u00e3o.<\/li>\n<li>Suporte ao CMake.<\/li>\n<li>Suporte a transa\u00e7\u00f5es aninhadas.<\/li>\n<li>Uso de bootid para determinar se ocorreu uma reinicializa\u00e7\u00e3o do sistema operacional (parada suja do banco de dados).<\/li>\n<li>Contagem abrangente de p\u00e1ginas atualizadas\/antigas e informa\u00e7\u00f5es ampliadas sobre transa\u00e7\u00f5es.<\/li>\n<li>Op\u00e7\u00e3o MDBX_ACCEDE para se conectar a um banco de dados j\u00e1 aberto em modo compat\u00edvel.<\/li>\n<li>Uso <a rel=\"nofollow\" href=\"https:\/\/www.gnu.org\/software\/libc\/manual\/html_node\/Open-File-Description-Locks.html\">bloqueios OFD<\/a> se dispon\u00edveis.<\/li>\n<li>Backup quente para pipe.<\/li>\n<li>Algoritmo de ordena\u00e7\u00e3o interna otimizado especializado (at\u00e9 2-3 vezes mais r\u00e1pido que qsort() e at\u00e9 30% mais r\u00e1pido que std::sort()).<\/li>\n<li>Aumentou a dura\u00e7\u00e3o m\u00e1xima da chave.<\/li>\n<li>Gerenciamento autom\u00e1tico da leitura antecipada (estrat\u00e9gia de cache de arquivos de banco de dados na mem\u00f3ria).<\/li>\n<li>Compacta\u00e7\u00e3o autom\u00e1tica mais agressiva e r\u00e1pida.<\/li>\n<li>Estrat\u00e9gia de mesclagem de p\u00e1ginas de B+ \u00e1rvore mais otimizada.<\/li>\n<li>Controle de sistemas de arquivos n\u00e3o locais (NFS, Samba, etc.) para prevenir a corrup\u00e7\u00e3o de bancos de dados em caso de uso incorreto.<\/li>\n<li>A gama de testes foi expandida.<\/li>\n<\/ul>\n<p><noindex><\/p>\n<p>O desenvolvimento da \"pr\u00f3xima\" vers\u00e3o do libmdbx continuar\u00e1 como parte de um projeto separado. <a rel=\"nofollow\" href=\"https:\/\/github.com\/leo-yuriev\/MithrilDB\">MithrilDB<\/a>, enquanto o vetor de desenvolvimento da \"vers\u00e3o atual\" do MDBX est\u00e1 focado na congelamento do conjunto de funcionalidades e estabiliza\u00e7\u00e3o. Essa decis\u00e3o foi tomada por tr\u00eas raz\u00f5es:<\/p>\n<p><\/noindex><\/p>\n<ul>\n<li>Incompatibilidade total: para implementar todas as funcionalidades planejadas no MithrilDB, \u00e9 necess\u00e1rio um formato de arquivo de banco de dados diferente (incompat\u00edvel) e uma API diferente (incompat\u00edvel).<\/li>\n<li>Novo c\u00f3digo-fonte: foi garantida a independ\u00eancia de licen\u00e7a do c\u00f3digo-fonte do MithrilDB em rela\u00e7\u00e3o ao LMDB, e o projeto ser\u00e1 publicado sob uma licen\u00e7a diferente (aprovada <a rel=\"nofollow\" href=\"https:\/\/opensource.org\/\">OSI<\/a> licen\u00e7a <a rel=\"nofollow\" href=\"https:\/\/opensource.org\/licenses\/Apache-2.0\">Apache 2.0<\/a>, e n\u00e3o <a rel=\"nofollow\" href=\"https:\/\/www.openldap.org\/software\/release\/license.html\">OpenLDAP Foundation<\/a>).<\/li>\n<li>A separa\u00e7\u00e3o ajuda a evitar confus\u00f5es potenciais, trazer mais clareza e garantir a independ\u00eancia do desenvolvimento dos projetos.<\/li>\n<\/ul>\n<p><noindex><\/p>\n<p>MithrilDB, assim como o MDBX, tamb\u00e9m \u00e9 baseado em <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\">\u00e1rvore B+<\/a> e ter\u00e1 desempenho extremamente alto, eliminando uma s\u00e9rie de desvantagens fundamentais do MDBX e LMDB. Em particular, o problema das \"leituras longas\", que se manifesta como um \"incha\u00e7o\" do banco de dados devido a transa\u00e7\u00f5es de leitura prolongadas que bloqueiam a coleta de lixo, ser\u00e1 resolvido. Entre as novas funcionalidades do MithrilDB, destaca-se:<\/p>\n<p><\/noindex><\/p>\n<ul>\n<li>suporte para o armazenamento de bancos de dados em diferentes tipos de dispositivos: HDD, SSD e mem\u00f3ria n\u00e3o vol\u00e1til.<\/li>\n<li>estrat\u00e9gias ideais para dados 'valiosos' e 'menos valiosos', para dados 'quentes', 'mornos' e 'frios'.<\/li>\n<li>uso de Merkle tree para controle de integridade do banco de dados.<\/li>\n<li>uso opcional de WAL e desempenho significativamente maior em cen\u00e1rios de grava\u00e7\u00e3o intensiva com garantias de integridade dos dados.<\/li>\n<li>fixa\u00e7\u00e3o de dados nos discos de forma pregui\u00e7osa e atrasada.<\/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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