the size limit of individual files is determined by the operating system. File size can be more than 4GB on operating systems that support large files. Use of raw disk partitions for global temporary tablespace data files is not supported. 說明：臨時表空間的臨時文件的大小是由操作系統決定的，文件大小是可以超過4G的，只有操作系統支持就可以了。通常我們用的操作系統都是CentOS或者RHEL 64位的。不支持裸設備。
