rails f log/development.log查看sql执行时间，来选择加索引的字段

rails f log/development.log查看sql执行时间，来选择加索引的字段

非常的有效，效果扛扛的

  config.action_controller.perform_caching = true#实际中改一下为true

测试时改为false

4.2 Being Specific

If you need to run a specific migration up or down the  db:migrate:up  and  db:migrate:down tasks will do that. Just specify the appropriate version and the corresponding migration will have its up  or  down  method invoked, for example

rake db:migrate:up VERSION=20080906120000

will run the  up  method from the 20080906120000 migration. These tasks check whether the migration has already run, so for example  db:migrate:up VERSION=20080906120000  will do nothing if Active Record believes that 20080906120000 has already been run.

查看更多关于rails f log/development.log查看sql执行时间，来选择加索引的字段的详细内容...

声明：本文来自网络，不代表【好得很程序员自学网】立场，转载请注明出处：http://www.haodehen.cn/did43244