diff options
Diffstat (limited to 'db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb')
-rw-r--r-- | db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb b/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb new file mode 100644 index 00000000000..cedf2510dda --- /dev/null +++ b/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb @@ -0,0 +1,21 @@ +class AddPartialIndexToProjectsForIndexOnlyScans < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + DOWNTIME = false + INDEX_NAME = 'index_projects_on_id_partial_for_visibility' + + disable_ddl_transaction! + + # Adds a partial index to leverage index-only scans when looking up project ids + def up + unless index_exists?(:projects, :id, name: INDEX_NAME) + add_concurrent_index :projects, :id, name: INDEX_NAME, unique: true, where: 'visibility_level IN (10,20)' + end + end + + def down + if index_exists?(:projects, :id, name: INDEX_NAME) + remove_concurrent_index_by_name :projects, INDEX_NAME + end + end +end |