Question

我正在慢慢地从开始轨道过渡到中间层。在我的任务中，我遇到了加载某些查询所需的时间问题。

我想知道是否有人可以指出一些可能会改善我的索引操作查询性能的事情。

运行Rails 3.2.0，ruby 1.9.3p194和MySQL

现在我正在列出所有机构（大约7000个），并且需要10秒才能加载......

我的索引操作

  def index
    @institution = Institution.includes(:state).all
  end

查看

<tbody>
    <% @institution.each do |c| %>
    <tr>
        <td><%= c.company %></td>
        <td><%= c.state.name %></td>
        <td><%= number_to_human(c.assets) %></td>
        <td><%= c.hadademo %></td>
        <td><%= c.datebecameclient %></td>
        <td><%= c.clientorprospect %></td>
        <% if current_user.admin? %>
            <td><%= link_to 'Edit', edit_institution_path(c), :class => 'btn btn-mini btn-warning'  %></td>
        <% end %>
    </tr>
    <% end %>
</tbody>

机构模型

class Institution < ActiveRecord::Base
  attr_accessible :company, :phone, :clientdate, :street, :city, :state_id, :zip, :source, :source2, :demodate1, :demodate2, :demodate3, :client, :prospect, :notcontacted, :solveid
  belongs_to :state
  has_many :users, :through => :company_reps
  has_many :company_reps


  def points
    points_for_client + points_for_demodate1
  end

  def hadademo
    if demodate3.present?
        demodate3.to_date
    elsif demodate2.present?    
        demodate2.to_date
    elsif demodate1.present?    
        demodate1.to_date
    else
        "No Demo"
    end 
  end

  def datebecameclient
    if clientdate.present?
        clientdate.to_date
    else
        "Not a Client"
    end 
  end

  def clientorprospect
      if client?
            "Client"
        elsif prospect? 
            "Prospect"
        else
            "No Contact"
        end 
  end

  def points_for_demodate1
    if demodate1.present? && demodate1 >= Date.new(2012, 2, 23) or demodate2.present? && demodate2 >= Date.new(2012, 2, 23) or demodate3.present? && demodate3 >= Date.new(2012, 2, 23)
      1
    else
      0
    end
  end

  def clientcount
    if client?
      1
    else
      0
    end
  end

  def points_for_client
    if client?
      10 / users.count
    else
      0
    end
  end


end

使用Jquery Datatables

jQuery ->
    $("#institutions").dataTable
      sDom: "<'row-fluid'<'span6'l><'span6'f>r>t<'row-fluid'<'span6'i><'span6'p>>"
      sPaginationType: "bootstrap"

日志文件

Started GET "/institutions" for xxx.xxx.xxx.xxx at 2012-11-13 02:51:47 +0000
Processing by InstitutionsController#index as HTML
  Rendered layouts/_messages.html.erb (1.2ms)
  Rendered institutions/index.html.erb within layouts/application (37190.3ms)
  Rendered layouts/_messages.html.erb (0.1ms)
  Rendered layouts/_navbar.html.erb (17.0ms)
Completed 200 OK in 43334ms (Views: 37983.7ms | ActiveRecord: 340.7ms)
  Rendered institutions/index.html.erb within layouts/application (34329.1ms)
  Rendered layouts/_messages.html.erb (0.1ms)
  Rendered layouts/_navbar.html.erb (23.3ms)
Completed 200 OK in 38824ms (Views: 34374.8ms | ActiveRecord: 82.2ms)

Answer 1

一般来说，有几件事要做：

的缓存即可。查看片段缓存，因为完全跳过数据库将提供巨大的加速。
数据库索引。由于您正在加载关联的模型，因此确保索引相关的外键可能有助于提高性能。
延迟加载。您可能希望渲染只说出前100条记录，并在用户浏览时通过AJAX加载更多记录。

除了发布生成的查询可能有助于我们提供进一步的提示。

Answer 2

如果查看日志，您会发现所有时间都花在渲染视图上，而不是实际查询上。您肯定希望实现视图或动作缓存以加快速度。

official docs会指向正确的方向。

加速Rails中的查询

2 个答案: