function metatag_update_7029 in Metatag 7
Add an index to the {metatag} table to speed up some queries.
File
- ./metatag.install, line 1964 
- Install, update, and uninstall functions for the metatag module.
Code
function metatag_update_7029() {
  if (!db_index_exists('metatag', 'type_revision')) {
    db_add_index('metatag', 'type_revision', array(
      'entity_type',
      'revision_id',
    ));
    return t('Added an index to the main Metatag table that will hopefully improve performance a little.');
  }
  else {
    return t('Did not add the index, it already existed.');
  }
}