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. 说明：临时表空间的临时文件的大小是由操作系统决定的，文件大小是可以超过4G的，只有操作系统支持就可以了。通常我们用的操作系统都是CentOS或者RHEL 64位的。不支持裸设备。
