CREATE TABLE `shared` ( `sid` INT NOT NULL AUTO_INCREMENT, `user_from` VARCHAR(255) NOT NULL, `calendar` VARCHAR(255) NOT NULL, `user_which` VARCHAR(255) NOT NULL, `options` TEXT NOT NULL, PRIMARY KEY(sid)) ENGINE=InnoDB; CREATE INDEX shareidx ON shared (user_from, calendar); CREATE INDEX sharedwithidx ON shared (user_which); CREATE INDEX last_activity_idx ON sessions(last_activity); ALTER TABLE sessions MODIFY user_agent VARCHAR(120);