Create indexes on pipeline stages before migration

Creates an index in ci_stages before migrating pipeline stages from
ci_builds, to improve migration performance.

1 files changed, 15 insertions, 0 deletions

diff --git a/db/post_migrate/20170526185748_create_index_in_pipeline_stages.rb b/db/post_migrate/20170526185748_create_index_in_pipeline_stages.rb
new file mode 100644
index 00000000000..d049f87578a
--- /dev/null
+++ b/db/post_migrate/20170526185748_create_index_in_pipeline_stages.rb
@@ -0,0 +1,15 @@
+class CreateIndexInPipelineStages < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index(:ci_stages, [:pipeline_id, :name])
+  end
+
+  def down
+    remove_index(:ci_stages, [:pipeline_id, :name])
+  end
+end