验证：
[root@rh6 ~]# umount /dev/shm [root@rh6 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 18G 5.2G 12G 32% / /dev/sda1 2.0G 62M 1.8G 4% /boot /dev/sda3 12G 5.7G 5.4G 52% /u01 /dev/sda5 9.9G 4.9G 4.6G 52% /usr /dev/sda7 4.2G 300M 3.7G 8% /var [root@rh6 ~]# mount tmpfs [root@rh6 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 18G 5.2G 12G 32% / /dev/sda1 2.0G 62M 1.8G 4% /boot /dev/sda3 12G 5.7G 5.4G 52% /u01 /dev/sda5 9.9G 4.9G 4.6G 52% /usr /dev/sda7 4.2G 300M 3.7G 8% /var tmpfs 1.3G 0 1.3G 0% /dev/shm [root@rh6 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Sun Sep 29 16:52:59 2013 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=85ffcaeb-1855-4f6a-b1af-d4e13d7b8850 / ext4 defaults 1 1 UUID=0e7c052e-fc2a-402a-82cc-116e7629ef8f /boot ext4 defaults 1 2 UUID=cf98cf21-ba1f-4a3a-aac3-43406dd5fca1 /u01 ext4 defaults 1 2 UUID=e3cf943c-48c4-4c4b-ba65-f11ba1f6a2e0 /usr ext4 defaults 1 2 UUID=c5dd449a-ce22-4d47-a6d3-2d09c0186489 /var ext4 defaults 1 2 UUID=e701d956-939e-441b-bad4-03b2057d4159 swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults,size=1300m 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0
[root@rh6 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 18G 5.2G 12G 32% / /dev/sda1 2.0G 62M 1.8G 4% /boot /dev/sda3 12G 5.7G 5.4G 52% /u01 /dev/sda5 9.9G 4.9G 4.6G 52% /usr /dev/sda7 4.2G 300M 3.7G 8% /var tmpfs 1.3G 0 1.3G 0% /dev/shm
重新启动Instance：
[oracle@rh6 ~]$ sqlplus '/as sysdba'
SQL*Plus: Release 11.2.0.3.0 Production on Thu Jun 25 11:34:39 2015
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 1252663296 bytes
Fixed Size 2227944 bytes
Variable Size 1224737048 bytes
Database Buffers 16777216 bytes
Redo Buffers 8921088 bytes
Database mounted.
Database opened.