Remove redundant index on project_mirror_data on GitLab.com53989-53993-remove-redundant-indices

3 files changed, 36 insertions, 1 deletions

diff --git a/changelogs/unreleased/53989-53993-remove-redundant-indices.yml b/changelogs/unreleased/53989-53993-remove-redundant-indices.yml
new file mode 100644
index 00000000000..effede598de
--- /dev/null
+++ b/changelogs/unreleased/53989-53993-remove-redundant-indices.yml
@@ -0,0 +1,5 @@
+---
+title: Remove index for next_execution_timestamp on project_mirror_data
+merge_request: 23512
+author:
+type: performance
diff --git a/db/migrate/20181203154104_remove_redundant_index_for_project_mirror_data.rb b/db/migrate/20181203154104_remove_redundant_index_for_project_mirror_data.rb
new file mode 100644
index 00000000000..c739826f106
--- /dev/null
+++ b/db/migrate/20181203154104_remove_redundant_index_for_project_mirror_data.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class RemoveRedundantIndexForProjectMirrorData < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index(*index_on_project_mirror_data)
+  end
+
+  def down
+    add_concurrent_index(*index_on_project_mirror_data)
+  end
+
+  private
+
+  def index_on_project_mirror_data
+    [
+      :project_mirror_data,
+      [:next_execution_timestamp],
+      { name: 'index_project_mirror_data_on_next_execution_timestamp' }
+    ]
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 995619bdc69..167bf05a40f 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20181126153547) do
+ActiveRecord::Schema.define(version: 20181203154104) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"