shell>startup
ORA-00845: MEMORY_TARGET not supported on this system

解决办法：
shell>df -h //查看 shm有多大

shell>vi /etc/fstab
tmpfs /dev/shm tmpfs defaults,size=2048M 0 0 //这里给的是2048M=2G

shell>umount /dev/shm
shell>mount /dev/shm