CREATE TABLE IF NOT EXISTS `demo` (
  `sess_id` varchar(128) NOT NULL,
  `created` datetime NOT NULL DEFAULT '1000-01-01 00:00:00',
  `changed` datetime NOT NULL DEFAULT '1000-01-01 00:00:00',
  `ip` varchar(40) NOT NULL,
  `vars` mediumtext NOT NULL,
  PRIMARY KEY (`sess_id`),
  KEY `changed_index` (`changed`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;