system.install

      $ret[] = update_sql('CREATE UNIQUE INDEX {node}_vid_idx ON {node}(vid)');
      $ret[] = update_sql('CREATE INDEX {node}_nid_idx ON {node}(nid)'); // Add index on nid
      break;
  }

  return $ret;
}

function system_update_181() {
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      $ret[] = update_sql("ALTER TABLE {profile_fields} ADD autocomplete TINYint NOT NULL AFTER visibility ;");
      break;
    case 'pgsql':
      db_add_column($ret, 'profile_fields', 'autocomplete', 'smallint', array('not null' => TRUE, 'default' => 0));
      break;
  }
  return $ret;
}

/**
 * The lid field in pgSQL should not be UNIQUE, but an INDEX.
 */
function system_update_182() {
  $ret = array();

  if ($GLOBALS['db_type'] == 'pgsql') {
    $ret[] = update_sql('ALTER TABLE {locales_target} DROP CONSTRAINT {locales_target}_lid_key');
    $ret[] = update_sql('CREATE INDEX {locales_target}_lid_idx ON {locales_target} (lid)');
  }

  return $ret;
}

/**
 * @defgroup updates-4.7-to-x.x System updates from 4.7 to x.x
 * @{
 */

function system_update_1000() {
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
    $ret[] = update_sql("CREATE TABLE {blocks_roles} (
      module varchar(64) NOT NULL,
      delta varchar(32) NOT NULL,
      rid int unsigned NOT NULL,
      PRIMARY KEY (module, delta, rid)
      ) /*!40100 DEFAULT CHARACTER SET utf8 */;");
    break;

    case 'pgsql':
    $ret[] = update_sql("CREATE TABLE {blocks_roles} (
      module varchar(64) NOT NULL,
      delta varchar(32) NOT NULL,
      rid integer NOT NULL,
      PRIMARY KEY (module, delta, rid)
      );");
    break;

  }
  return $ret;
}

function system_update_1001() {
  // change DB schema for better poll support
  $ret = array();

  switch ($GLOBALS['db_type']) {
    case 'mysqli':
    case 'mysql':
      // alter poll_votes table
      $ret[] = update_sql("ALTER TABLE {poll_votes} ADD COLUMN chorder int NOT NULL default -1 AFTER uid");
      break;

    case 'pgsql':
      db_add_column($ret, 'poll_votes', 'chorder', 'int', array('not null' => TRUE, 'default' => "'-1'"));
      break;
  }

  return $ret;
}

function system_update_1002() {
  // Make the forum's vocabulary the highest in list, if present
  $ret = array();

  if ($vid = (int) variable_get('forum_nav_vocabulary', 0)) {
    $ret[] = update_sql('UPDATE {vocabulary} SET weight = -10 WHERE vid = '. $vid);
  }

  return $ret;
}

function system_update_1003() {
  // Make use of guid in feed items
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      $ret[] = update_sql("ALTER TABLE {aggregator_item} ADD guid varchar(255) AFTER timestamp ;");
      break;
    case 'pgsql':
      db_add_column($ret, 'aggregator_item', 'guid', 'varchar(255)');
      break;
  }
  return $ret;
}


function system_update_1004() {
  // Increase the size of bid in boxes and aid in access
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
    $ret[] = update_sql("ALTER TABLE {access} CHANGE `aid` `aid` INT( 10 ) NOT NULL AUTO_INCREMENT ");
    $ret[] = update_sql("ALTER TABLE {boxes} CHANGE `bid` `bid` INT( 10 ) NOT NULL AUTO_INCREMENT ");
      break;
    case 'pgsql':
      // No database update required for PostgreSQL because it already uses big SERIAL numbers.
      break;
  }
  return $ret;
}

function system_update_1005() {
  // Add ability to create dynamic node types like the CCK module
  $ret = array();

  switch ($GLOBALS['db_type']) {
    case 'mysqli':
    case 'mysql':
      // Create node_type table
      $ret[] = update_sql("CREATE TABLE {node_type} (
        type varchar(32) NOT NULL,
        name varchar(255) NOT NULL,
        module varchar(255) NOT NULL,
        description mediumtext NOT NULL,
        help mediumtext NOT NULL,
        has_title tinyint unsigned NOT NULL,
        title_label varchar(255) NOT NULL default '',
        has_body tinyint unsigned NOT NULL,
        body_label varchar(255) NOT NULL default '',
        min_word_count smallint unsigned NOT NULL,
        custom tinyint NOT NULL DEFAULT '0',
        modified tinyint NOT NULL DEFAULT '0',
        locked tinyint NOT NULL DEFAULT '0',
        orig_type varchar(255) NOT NULL default '',
        PRIMARY KEY (type)
        ) /*!40100 DEFAULT CHARACTER SET utf8 */;");
      break;

    case 'pgsql':
      $ret[] = update_sql("CREATE TABLE {node_type} (
        type varchar(32) NOT NULL,
        name varchar(255) NOT NULL,
        module varchar(255) NOT NULL,
        description text NOT NULL,
        help text NOT NULL,
        has_title integer unsigned NOT NULL,
        title_label varchar(255) NOT NULL default '',
        has_body integer unsigned NOT NULL,
        body_label varchar(255) NOT NULL default '',
        min_word_count integer unsigned NOT NULL,
        custom smallint NOT NULL DEFAULT '0',
        modified smallint NOT NULL DEFAULT '0',
        locked smallint NOT NULL DEFAULT '0',
        orig_type varchar(255) NOT NULL default '',
        PRIMARY KEY (type)
        );");
      break;
  }

  // Insert default user-defined node types into the database.
  $types = array(
    array(
      'type' => 'page',
      'name' => t('page'),
      'module' => 'node',
      'description' => t('If you want to add a static page, like a contact page or an about page, use a page.'),
      'custom' => TRUE,
      'modified' => TRUE,
      'locked' => FALSE,
    ),
    array(
      'type' => 'story',
      'name' => t('story'),
      'module' => 'node',
      'description' => t('Stories are articles in their simplest form: they have a title, a teaser and a body, but can be extendd by other modules. The teaser is part of the body too. Stories may be used as a personal blog or for news articles.'),
      'custom' => TRUE,
      'modified' => TRUE,
      'locked' => FALSE,
    )
  );

  foreach ($types as $type) {
    $type = (object) _node_type_set_defaults($type);
    node_type_save($type);
  }

  cache_clear_all();
  system_modules();
  menu_rebuild();
  node_types_rebuild();

  // Migrate old values for 'minimum_x_size' variables to the node_type table.
  $query = db_query('SELECT type FROM {node_type}');
  while ($result = db_fetch_object($query)) {
    $variable_name = 'minimum_'. $result->type .'_size';
    if ($value = db_fetch_object(db_query("SELECT value FROM {variable} WHERE name = '%s'", $variable_name))) {
      $value = (int) unserialize($value->value);
      db_query("UPDATE {node_type} SET min_word_count = %d, modified = %d WHERE type = '%s'", $value, 1, $result->type);
      variable_del($variable_name);
    }
  }

  node_types_rebuild();

  return $ret;
}

function system_update_1006() {
  // Add a customizable title to all blocks.
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
    $ret[] = update_sql("ALTER TABLE {blocks} ADD title VARCHAR(64) NOT NULL DEFAULT ''");
      break;
    case 'pgsql':
      db_add_column($ret, 'blocks', 'title', 'varchar(64)', array('default' => '', 'not null' => TRUE));
      break;
  }
  // Migrate custom block titles to new column.
  $boxes = db_query('SELECT bid, title from {boxes}');
  while ($box = db_fetch_object($boxes)) {
    db_query("UPDATE {blocks} SET title = '%s' WHERE delta = %d and module = 'block'", $box->title, $box->bid);
  }
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      $ret[] = update_sql('ALTER TABLE {boxes} DROP title');
      break;
    case 'pgsql':
      $ret[] = update_sql('ALTER TABLE {boxes} DROP COLUMN title');
      break;
  }
  return $ret;
}

function system_update_1007() {
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      $ret[] = update_sql("ALTER TABLE {aggregator_item} ADD INDEX (fid)");
      break;
    case 'pgsql':
      $ret[] = update_sql("CREATE INDEX {aggregator_item}_fid_idx ON {aggregator_item} (fid)");
      break;
  }
  return $ret;
}

/**
 * Performance update for queries that are related to the locale.module
 */
function system_update_1008() {
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      $ret[] = update_sql('ALTER TABLE {locales_source} ADD KEY source (source(30))');
      break;
    case 'pgsql':
      $ret[] = update_sql("CREATE INDEX {locales_source}_source_idx on {locales_source} (source)");
  }

  return $ret;
}

function system_update_1009() {
 $ret = array();
 switch ($GLOBALS['db_type']) {
   case 'mysql':
   case 'mysqli':
     $ret[] = update_sql("CREATE TABLE {cache_filter} (
       cid varchar(255) NOT NULL default '',
       data longblob,
       expire int NOT NULL default '0',
       created int NOT NULL default '0',
       headers text,
       PRIMARY KEY (cid),
       INDEX expire (expire)
     ) /*!40100 DEFAULT CHARACTER SET UTF8 */ ");
     $ret[] = update_sql("CREATE TABLE {cache_menu} (
       cid varchar(255) NOT NULL default '',
       data longblob,
       expire int NOT NULL default '0',
       created int NOT NULL default '0',
       headers text,
       PRIMARY KEY (cid),
       INDEX expire (expire)
     ) /*!40100 DEFAULT CHARACTER SET UTF8 */ ");
     $ret[] = update_sql("CREATE TABLE {cache_page} (
       cid varchar(255) NOT NULL default '',
       data longblob,
       expire int NOT NULL default '0',
       created int NOT NULL default '0',
       headers text,
       PRIMARY KEY (cid),
       INDEX expire (expire)
     ) /*!40100 DEFAULT CHARACTER SET UTF8 */ ");
     break;
   case 'pgsql':
     $ret[] = update_sql("CREATE TABLE {cache_filter} (
       cid varchar(255) NOT NULL default '',
       data bytea,
       expire int NOT NULL default '0',
       created int NOT NULL default '0',
       headers text,
       PRIMARY KEY (cid)
     )");
     $ret[] = update_sql("CREATE TABLE {cache_menu} (
       cid varchar(255) NOT NULL default '',
       data bytea,
       expire int NOT NULL default '0',
       created int NOT NULL default '0',
       headers text,
       PRIMARY KEY (cid)
     )");
     $ret[] = update_sql("CREATE TABLE {cache_page} (
       cid varchar(255) NOT NULL default '',
       data bytea,
       expire int NOT NULL default '0',
       created int NOT NULL default '0',
       headers text,
       PRIMARY KEY (cid)
     )");
     $ret[] = update_sql("CREATE INDEX {cache_filter}_expire_idx ON {cache_filter} (expire)");
     $ret[] = update_sql("CREATE INDEX {cache_menu}_expire_idx ON {cache_menu} (expire)");
     $ret[] = update_sql("CREATE INDEX {cache_page}_expire_idx ON {cache_page} (expire)");
     break;
 }
 return $ret;
}

function system_update_1010() {
  $ret = array();

  // Disable urlfilter.module, if it exists.
  if (module_exists('urlfilter')) {
    module_disable('urlfilter');
    $ret[] = update_sql("UPDATE {filter_formats} SET module = 'filter', delta = 3 WHERE module = 'urlfilter'");
    $ret[] = t('URL Filter module was disabled; this functionality has now been added to core.');
  }

  return $ret;
}

function system_update_1011() {
  $ret = array();
  $ret[] = update_sql('UPDATE {menu} SET mid = 2 WHERE mid = 0');
  cache_clear_all();
  return $ret;
}

function system_update_1012() {
  $ret = array();
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      $ret[] = update_sql("ALTER TABLE {file_revisions} ADD INDEX(vid)");
      break;
    case 'pgsql':
      $ret[] = update_sql('CREATE INDEX {file_revisions}_vid_idx ON {file_revisions}(vid)');
      break;
  }
  return $ret;
}

/**
 * @} End of "defgroup updates-4.7-to-x.x"
 * The next series of updates should start at 2000.
 */