Update table indices to make them more rational and useful.

Related topics

File

drupal-6.x/modules/system/system.install, line 2418

Code

function system_update_6043() {
  $ret = array();
  // Required modules first.
  // Add new system module indexes.
  db_add_index($ret, 'flood', 'allow', array('event', 'hostname', 'timestamp'));
  db_add_index($ret, 'history', 'nid', array('nid'));
  // Change length of theme field in {blocks} to be consistent with module, and
  // to avoid a MySQL error regarding a too-long index.  Also add new indices.
  db_change_field($ret, 'blocks', 'theme', 'theme', array('type' => 'varchar', 'length' => 64, 'not null' => TRUE, 'default' => ''), array(
    'unique keys' => array('tmd' => array('theme', 'module', 'delta'),),
    'indexes' => array('list' => array('theme', 'status', 'region', 'weight', 'module'),),));
  db_add_index($ret, 'blocks_roles', 'rid', array('rid'));
  // Improve filter module indices.
  db_drop_index($ret, 'filters', 'weight');
  db_add_unique_key($ret, 'filters', 'fmd', array('format', 'module', 'delta'));
  db_add_index($ret, 'filters', 'list', array('format', 'weight', 'module', 'delta'));
  // Drop unneeded keys form the node table.
  db_drop_index($ret, 'node', 'status');
  db_drop_unique_key($ret, 'node', 'nid_vid');
  // Improve user module indices.
  db_add_index($ret, 'users', 'mail', array('mail'));
  db_add_index($ret, 'users_roles', 'rid', array('rid'));

  // Optional modules - need to check if the tables exist.
  // Alter aggregator module's tables primary keys to make them more useful.
  if (db_table_exists('aggregator_category_feed')) {
    db_drop_primary_key($ret, 'aggregator_category_feed');
    db_add_primary_key($ret, 'aggregator_category_feed', array('cid', 'fid'));
    db_add_index($ret, 'aggregator_category_feed', 'fid', array('fid'));
  }
  if (db_table_exists('aggregator_category_item')) {
    db_drop_primary_key($ret, 'aggregator_category_item');
    db_add_primary_key($ret, 'aggregator_category_item', array('cid', 'iid'));
    db_add_index($ret, 'aggregator_category_item', 'iid', array('iid'));
  }
  // Alter contact module's table to add an index.
  if (db_table_exists('contact')) {
    db_add_index($ret, 'contact', 'list', array('weight', 'category'));
  }
  // Alter locale table to add a primary key, drop an index.
  if (db_table_exists('locales_target')) {
    db_add_primary_key($ret, 'locales_target', array('language', 'lid', 'plural'));
  }
  // Alter a poll module table to add a primary key.
  if (db_table_exists('poll_votes')) {
    db_drop_index($ret, 'poll_votes', 'nid');
    db_add_primary_key($ret, 'poll_votes', array('nid', 'uid', 'hostname'));
  }
  // Alter a profile module table to add a primary key.
  if (db_table_exists('profile_values')) {
    db_drop_index($ret, 'profile_values', 'uid');
    db_drop_index($ret, 'profile_values', 'fid');
    db_change_field($ret, 'profile_values', 'fid', 'fid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0,), array('indexes' => array('fid' => array('fid'),)));
    db_change_field($ret, 'profile_values', 'uid', 'uid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0,));
    db_add_primary_key($ret, 'profile_values', array('uid', 'fid'));
  }
  // Alter a statistics module table to add an index.
  if (db_table_exists('accesslog')) {
    db_add_index($ret, 'accesslog', 'uid', array('uid'));
  }
  // Alter taxonomy module's tables.
  if (db_table_exists('term_data')) {
    db_drop_index($ret, 'term_data', 'vid');
    db_add_index($ret, 'term_data', 'vid_name', array('vid', 'name'));
    db_add_index($ret, 'term_data', 'taxonomy_tree', array('vid', 'weight', 'name'));
  }
  if (db_table_exists('term_node')) {
    db_drop_primary_key($ret, 'term_node');
    db_drop_index($ret, 'term_node', 'tid');
    db_add_primary_key($ret, 'term_node', array('tid', 'vid'));
  }
  if (db_table_exists('term_relation')) {
    db_drop_index($ret, 'term_relation', 'tid1');
    db_add_unique_key($ret, 'term_relation', 'tid1_tid2', array('tid1', 'tid2'));
  }
  if (db_table_exists('term_synonym')) {
    db_drop_index($ret, 'term_synonym', 'name');
    db_add_index($ret, 'term_synonym', 'name_tid', array('name', 'tid'));
  }
  if (db_table_exists('vocabulary')) {
    db_add_index($ret, 'vocabulary', 'list', array('weight', 'name'));
  }
  if (db_table_exists('vocabulary_node_types')) {
    db_drop_primary_key($ret, 'vocabulary_node_types');
    db_add_primary_key($ret, 'vocabulary_node_types', array('type', 'vid'));
    db_add_index($ret, 'vocabulary_node_types', 'vid', array('vid'));
  }
  // If we updated in RC1 or before ensure we don't update twice.
  variable_set('system_update_6043_RC2', TRUE);

  return $ret;
}