1 files changed, 19 insertions, 0 deletions
diff --git a/db/post_migrate/20220613095911_create_confidential_notes_index_on_id.rb b/db/post_migrate/20220613095911_create_confidential_notes_index_on_id.rb
new file mode 100644
index 00000000000..80c26c3ea8a
--- /dev/null
+++ b/db/post_migrate/20220613095911_create_confidential_notes_index_on_id.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class CreateConfidentialNotesIndexOnId < Gitlab::Database::Migration[2.0]
+  OLD_INDEX_NAME = 'index_notes_on_confidential'
+  INDEX_NAME = 'index_notes_on_id_where_confidential'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :notes, name: OLD_INDEX_NAME
+    add_concurrent_index :notes, :id, where: 'confidential = true', name: INDEX_NAME
+  end
+
+  def down
+    # we don't have to re-create OLD_INDEX_NAME index
+    # because it wasn't used yet, also its creation might be expensive
+    remove_concurrent_index_by_name :notes, name: INDEX_NAME
+  end
+end