加速导轨查询

我有一张包含10k产品的表格。当服务器重新启动后查询数据库时，服务器正在查询所有10k产品，然后在响应中限制为15条记录。这是正常的吗？这会导致我的页面需要23秒才能加载第一页。在第二次请求时，一切都看起来更好，但我仍不明白为什么第一个查询会抓取所有这些记录。加速导轨查询

我的查询：

@products = Product.limit(15)

的第一个反应：

Started GET "/admin/admin_products/" for 50.255.94.246 at 2017-05-31 17:43:49 +0000 
Cannot render console from 50.255.94.246! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255 
ActiveRecord::SchemaMigration Load (0.6ms) SELECT "schema_migrations".* FROM "schema_migrations" 
Processing by AdminProductsController#index as HTML 
/home/ubuntu/workspace/app/models/product.rb:96: warning: key :description is duplicated and overwritten on line 96 
Product Load (5.7ms) SELECT "products".* FROM "products" ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (12.2ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 1000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (6.4ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 2000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (9.6ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 3000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (9.2ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 4000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (9.1ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 5000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (9.9ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 6000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (9.4ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 7000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (59.5ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 8000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (131.0ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 9000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
Product Load (2.1ms) SELECT "products".* FROM "products" WHERE ("products"."id" > 10000) ORDER BY "products"."id" ASC LIMIT $1 [["LIMIT", 1000]] 
    Rendering admin_products/index.html.erb within layouts/application 
    Rendered layouts/_admin_portal.html.erb (0.6ms) 
    Product Load (0.8ms) SELECT "products".* FROM "products" LIMIT $1 [["LIMIT", 15]] 
    Rendered collection of admin_products/_product.html.erb [15 times] (2.8ms) 
    Rendered admin_products/_paginate.html.erb (0.6ms) 
    Rendered admin_products/index.html.erb within layouts/application (15.9ms) 
    Rendered layouts/_flash_messages.html.erb (0.8ms) 
Completed 200 OK in 23486ms (Views: 7643.7ms | ActiveRecord: 269.2ms)

我第二次执行查询：

Started GET "/admin/admin_products/" for 50.255.94.246 at 2017-05-31 
17:59:00 +0000 
Cannot render console from 50.255.94.246! Allowed networks: 127.0.0.1, ::1, 
127.0.0.0/127.255.255.255 
Processing by AdminProductsController#index as HTML 
Rendering admin_products/index.html.erb within layouts/application 
Rendered layouts/_admin_portal.html.erb (0.5ms) 
Product Load (0.9ms) SELECT "products".* FROM "products" LIMIT $1 [["LIMIT", 15]] 
Rendered collection of admin_products/_product.html.erb [15 times] (2.7ms) 
Rendered admin_products/_paginate.html.erb (0.6ms) 
Rendered admin_products/index.html.erb within layouts/application (10.8ms) 
Rendered layouts/_flash_messages.html.erb (0.8ms) 
Completed 200 OK in 26ms (Views: 23.5ms | ActiveRecord: 0.9ms)

来源

2017-05-31 Cannon Moyer

你可以在产品型号中显示代码吗？你有没有读过你的产品表的初始化程序？ – SteveTurczyn

我没有想到这一点，但它是有道理的。我进行了弹性搜索的整合，导致问题并在模型实例化时强制导入。我删除它，一切按预期工作。感谢您指出了这一点。 @SteveTurczyn –

您是否使用默认范围？ –

@SteveTurczyn指出我的问题，它结束了相当简单。问题涉及为我的产品模型中的弹性搜索调用导入函数。在我删除了这行代码之后，所有事情都按预期工作。这是减慢过程的代码。

Product.includes(normal_model: [:normal_brand]).import force: true

我现在有一个控制器方法，在需要时调用导入功能。

来源

2017-06-01 19:10:22

加速导轨查询

回答

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