{"id":2034,"date":"2016-02-04T19:35:47","date_gmt":"2016-02-04T19:35:47","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2034"},"modified":"2025-06-13T21:23:10","modified_gmt":"2025-06-14T04:23:10","slug":"prepare-for-performance","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/prepare-for-performance\/","title":{"rendered":"Prepare-se para isso!"},"content":{"rendered":"<h2><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10267 size-full\" src=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2016\/02\/prepare-for-performance.png\" alt=\"\" width=\"446\" height=\"182\" srcset=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/prepare-for-performance.png 446w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/prepare-for-performance-300x122.png 300w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/prepare-for-performance-20x8.png 20w\" sizes=\"auto, (max-width: 446px) 100vw, 446px\" \/><\/h2>\n<h2>Get Prepared....<\/h2>\n<p>Um dos aspectos mais impressionantes do uso do N1QL \u00e9 a capacidade de usar instru\u00e7\u00f5es preparadas. O que s\u00e3o instru\u00e7\u00f5es preparadas? Por que us\u00e1-los? Qual \u00e9 a vantagem? Considere o seguinte exemplo do bucket e do conjunto de dados de amostra de viagens que acompanham todas as instala\u00e7\u00f5es do couchbase: Considere os usu\u00e1rios que criam contas, fazem login e pesquisam voos. Talvez queiramos uma maneira r\u00e1pida de identificar os usu\u00e1rios que usaram o sistema, mas nunca reservaram um voo. Esse \u00e9 um caso de uso comum de segmenta\u00e7\u00e3o de an\u00fancios e cria uma oportunidade para um ponto de contato. Uma consulta simplificada pode ser semelhante a:<\/p>\n<p><strong>SELECT name FROM `travel-sample` WHERE _type=&#8217;User&#8217; AND ARRAY_LENGTH(flights)=0; <\/strong><\/p>\n<p>Vamos examinar as etapas necess\u00e1rias para executar essa consulta em nosso aplicativo. Usaremos o nodejs para o nosso exemplo, e todos os SDKs que usam a API 2.0 funcionar\u00e3o de maneira id\u00eantica.<\/p>\n<ul>\n<li>Primeiro, temos que criar a consulta N1QL a partir de uma string.<\/li>\n<li>Em segundo lugar, serializamos a solicita\u00e7\u00e3o e a enviamos para o CBQ-ENGINE no n\u00f3 do servidor couchbase usando HTTP REST.<\/li>\n<li>Em terceiro lugar, o CBQ-ENGINE deve analisar a consulta.<\/li>\n<li>Em quarto lugar, o otimizador do CBQ-ENGINE deve determinar um plano de execu\u00e7\u00e3o.<\/li>\n<li>Em quinto lugar, o CBQ-ENGINE deve criar o plano de execu\u00e7\u00e3o.<\/li>\n<li>Em sexto lugar, o CBQ-ENGINE executa o plano.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10270\" src=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2016\/02\/unprepared.png\" alt=\"\" width=\"622\" height=\"32\" srcset=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/unprepared.png 622w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/unprepared-300x15.png 300w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/unprepared-20x1.png 20w\" sizes=\"auto, (max-width: 622px) 100vw, 622px\" \/><\/p>\n<p>Isso representa uma quantidade substancial de trabalho para emitir uma consulta simples, especialmente para consultas que s\u00e3o repetidas v\u00e1rias vezes. H\u00e1 casos em seu aplicativo em que a mesma consulta pode ser executada milhares de vezes em uma hora. Como podemos eliminar essa sobrecarga de an\u00e1lise\/an\u00e1lise\/cria\u00e7\u00e3o de um plano?<\/p>\n<h2>Prepare-se para acelerar!<\/h2>\n<p>Podemos eliminar a sobrecarga preparando a instru\u00e7\u00e3o para execu\u00e7\u00e3o. Usamos um par\u00e2metro adicional em nossa consulta N1QL, adhoc=false.<\/p>\n<p>O que isso significa exatamente? Significa que o SDK passar\u00e1 uma consulta para o CBQ-ENGINE, informando ao mecanismo, na primeira vez em que a consulta for emitida, que \"quero que voc\u00ea gere um plano de execu\u00e7\u00e3o, que eu possa reutilizar, e o retorne para mim em um formato compactado\". Depois dessa primeira vez, sempre que o aplicativo chamar essa consulta espec\u00edfica, o SDK passar\u00e1 o plano compactado para o CBQ-ENGINE, eliminando todas as etapas de an\u00e1lise\/parsing\/cria\u00e7\u00e3o e indo direto para a execu\u00e7\u00e3o<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10271\" src=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2016\/02\/prepared.png\" alt=\"\" width=\"292\" height=\"32\" srcset=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/prepared.png 292w, https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2016\/02\/prepared-20x2.png 20w\" sizes=\"auto, (max-width: 292px) 100vw, 292px\" \/><\/p>\n<h2>Estar preparado<\/h2>\n<p>Ent\u00e3o, como isso funciona? Quando uma consulta \u00e9 transmitida e o sinalizador adhoc \u00e9 definido como falso, o SDK armazena o plano de consulta local compactado no cache para reutiliza\u00e7\u00e3o no futuro; quando a consulta \u00e9 emitida novamente, o SDK usa o plano local compactado do cache. O SDK usa um cache LRU (least recently used) para economizar mem\u00f3ria: o SDK come\u00e7ar\u00e1 a remover as entradas mais antigas quando o cache atingir o tamanho de 5.000 consultas.<\/p>\n<p>Tudo isso \u00e9 gerenciado internamente no SDK. Como usu\u00e1rio, a \u00fanica coisa que voc\u00ea precisa fazer \u00e9 definir a propriedade adhoc como false.<\/p>\n<h2>Uma on\u00e7a de preven\u00e7\u00e3o<\/h2>\n<p>Algumas pr\u00e1ticas recomendadas a serem consideradas ao usar declara\u00e7\u00f5es preparadas<\/p>\n<ul>\n<li>Atualmente, os comandos preparados s\u00e3o espec\u00edficos da inst\u00e2ncia do SDK. O cache LRU local de instru\u00e7\u00f5es preparadas \u00e9 espec\u00edfico para cada inst\u00e2ncia do SDK que o aplicativo est\u00e1 usando. No momento, n\u00e3o h\u00e1 cache compartilhado de instru\u00e7\u00f5es entre clientes.<\/li>\n<li>Se o seu aplicativo for de natureza extremamente adhoc, os comandos preparados s\u00e3o uma m\u00e1 escolha para esses tipos de consultas. A sobrecarga da prepara\u00e7\u00e3o anula qualquer ganho de desempenho obtido pela possibilidade de usar repetidamente o mesmo plano de execu\u00e7\u00e3o.<\/li>\n<li>As instru\u00e7\u00f5es preparadas s\u00e3o planos de execu\u00e7\u00e3o congelados no tempo. Mudan\u00e7as na topologia que movam, alterem ou excluam \u00edndices far\u00e3o com que o plano de execu\u00e7\u00e3o atual seja invalidado. Os SDKs t\u00eam uma l\u00f3gica de repeti\u00e7\u00e3o integrada para lidar com esses casos extremos<\/li>\n<li>Se voc\u00ea pretende emitir a mesma consulta repetidamente com par\u00e2metros diferentes, use consultas parametrizadas em vez de incorporar os valores dos par\u00e2metros na string da consulta. Isso permite que voc\u00ea use o mesmo plano com par\u00e2metros diferentes.<\/li>\n<\/ul>\n<p>Para obter mais exemplos de como usar o Couchbase no idioma de sua prefer\u00eancia, consulte a se\u00e7\u00e3o <a href=\"https:\/\/developer.couchbase.com\/documentation\/server\/4.1\/developer-guide\/intro.html\">Guia do desenvolvedor<\/a>e github <a href=\"https:\/\/github.com\/couchbaselabs\/devguide-examples\">reposit\u00f3rio<\/a>. Baixar <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/downloads\/\">Couchbase<\/a> hoje e prepare-se!<\/p>","protected":false},"excerpt":{"rendered":"<p>Get Prepared&#8230;. One of the more impressive aspects of using N1QL\u00a0is the ability to use prepared statements. What are prepared statements? Why use them? What&#8217;s the big deal? Consider the following example\u00a0from the travel-sample bucket and dataset that are bundled [&hellip;]<\/p>","protected":false},"author":20,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[9417,1822,1812],"tags":[],"ppma_author":[9019],"class_list":["post-2034","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-performance","category-node-js","category-n1ql-query"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.8 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Prepare for This! - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/prepare-for-performance\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Prepare for This!\" \/>\n<meta property=\"og:description\" content=\"Get Prepared&#8230;. 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