Rails排序或排序查詢很慢

Question

使用Rails 3.2，Ruby 1.9和will_paginate。 我有100,000條記錄，並測試了以下查詢：

# 1000+ms to load
@shops = Shop.where(:shop_type => @type).paginate(:include => :photos, :page => params[:page], :per_page => 25, :order => 'created_at DESC')

# 1000+ms to load
@shops = Shop.paginate(:include => :photos, :page => params[:page], :per_page => 25, :order => 'created_at DESC')

# 1000+ms to load
@shops = Shop.order('created_at DESC').limit(25)

# 1+ms to load
@shops = Shop.paginate(:include => :photos, :page => params[:page], :per_page => 25)

我注意到order選項的速度非常慢。 測試結果表明will_paginate不是問題。

我應該如何更改它order可以加快查詢order 。

Answer 1

是的，嘗試在訂單列上創建索引。 它將加快速度。