Added some database indexes to commonly queried fields.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3206 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/20091220183509_add_lft_and_rgt_indexes_to_projects.rb

@@ -0,0 +1,11 @@
+class AddLftAndRgtIndexesToProjects < ActiveRecord::Migration
+  def self.up
+    add_index :projects, :lft
+    add_index :projects, :rgt
+  end
+
+  def self.down
+    remove_index :projects, :lft
+    remove_index :projects, :rgt
+  end
+end

db/migrate/20091220183727_add_index_to_settings_name.rb

@@ -0,0 +1,9 @@
+class AddIndexToSettingsName < ActiveRecord::Migration
+  def self.up
+    add_index :settings, :name
+  end
+
+  def self.down
+    remove_index :settings, :name
+  end
+end

db/migrate/20091220184736_add_indexes_to_issue_status.rb

@@ -0,0 +1,13 @@
+class AddIndexesToIssueStatus < ActiveRecord::Migration
+  def self.up
+    add_index :issue_statuses, :position
+    add_index :issue_statuses, :is_closed
+    add_index :issue_statuses, :is_default
+  end
+
+  def self.down
+    remove_index :issue_statuses, :position
+    remove_index :issue_statuses, :is_closed
+    remove_index :issue_statuses, :is_default
+  end
+end