add index to votes on created_at and question_id

this is used for a query in the admin area that lists gets count of votes by question for today

add index to votes on created_at and question_id
this is used for a query in the admin area that lists gets count of votes by question for today
Luke Baker
1 parent 6c7b80b0
Showing 2 changed files with 13 additions and 1 deletions Show diff stats
db/migrate/20110628160608_add_index_for_created_at_question_id_to_votes.rb
db/schema.rb
@@ -0,0 +1,11 @@
+class AddIndexForCreatedAtQuestionIdToVotes < ActiveRecord::Migration
+  # this is for a query in the admin area
+  # EXPLAIN SELECT count(*) AS count_all, votes.question_id AS votes_question_id FROM `votes` INNER JOIN `questions` ON `questions`.id = `votes`.question_id  WHERE (votes.created_at > '2011-06-01') AND (votes.valid_record = 1) GROUP BY votes.question_id;
+  def self.up
+    add_index :votes, [:created_at, :question_id]
+  end
+
+  def self.down
+    remove_index :votes, [:created_at, :question_id]
+  end
+end
@@ -9,7 +9,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
-ActiveRecord::Schema.define(:version => 20110620185325) do
+ActiveRecord::Schema.define(:version => 20110628160608) do
   create_table "appearances", :force => true do |t|
     t.integer  "voter_id"
@@ -250,6 +250,7 @@ ActiveRecord::Schema.define(:version =&gt; 20110620185325) do
   end
   add_index "votes", ["choice_id"], :name => "choice_id_idx"
+  add_index "votes", ["created_at", "question_id"], :name => "index_votes_on_created_at_and_question_id"
   add_index "votes", ["loser_choice_id"], :name => "loser_choice_id_idx"
   add_index "votes", ["question_id"], :name => "question_id_idx"
   add_index "votes", ["voter_id"], :name => "index_votes_on_voter_id"
@@ -0,0 +1,11 @@		@@ -0,0 +1,11 @@
	1	+class AddIndexForCreatedAtQuestionIdToVotes < ActiveRecord::Migration
	2	+ # this is for a query in the admin area
	3	+ # EXPLAIN SELECT count(*) AS count_all, votes.question_id AS votes_question_id FROM `votes` INNER JOIN `questions` ON `questions`.id = `votes`.question_id WHERE (votes.created_at > '2011-06-01') AND (votes.valid_record = 1) GROUP BY votes.question_id;
	4	+ def self.up
	5	+ add_index :votes, [:created_at, :question_id]
	6	+ end
	7	+
	8	+ def self.down
	9	+ remove_index :votes, [:created_at, :question_id]
	10	+ end
	11	+end