SQL> startup
ORA-00845: MEMORY_TARGET not supported on this system
解决方案
1.初始化参数MEMORY_TARGET或MEMORY_MAX_TARGET不能大于共享内存(/dev/shm),为了解决这个问题，可以增大/dev/shm
如：
# mount -t tmpfs shmfs -o size=7g /dev/shm
2.为了确保操作系统重启之后能生效，需要修改/etc/fstab文件
shmfs /dev/shm tmpfs size=7g 0
3.如果/dev/shm没有挂载也会报上面的错，所认需要确保已经挂载
oracle@aaaprod-db ~]$ df -h
……
tmpfs 16G 8.9G 7.2G 56% /dev/shm
……
下面为一次操作的记录
[root@aaaprod-db ~]# cat /etc/fstab | grep tmpfs
tmpfs /dev/shm tmpfs defaults,size=8g 0 0
[root@aaaprod-db ~]#
[root@aaaprod-db ~]# mount -o remount,size=16G /dev/shm
[root@aaaprod-db ~]#
[root@aaaprod-db ~]# cat /etc/fstab | grep tmpfs
tmpfs /dev/shm tmpfs defaults,size=8g 0 0
[root@aaaprod-db ~]# vi /etc/fstab
/dev/rootvg/LogVol02 / ext3 defaults 1 1
/dev/rootvg/LogVol01 /tmp ext3 defaults 1 2
/dev/rootvg/lvol0 /ebao ext3 defaults 1 2
/dev/rootvg/lvol1 /backup ext3 defaults 1 2
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults,size=16g 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/rootvg/LogVol00 swap swap defaults 0 0
"/etc/fstab" 10L, 769C written
[root@aaaprod-db ~]# df -h|grep shm
tmpfs 16G 0 16G 0% /dev/shm
SQL> startup
ORACLE instance started.
Total System Global Area 9420095488 bytes
Fixed Size 2236248 bytes
Variable Size 2315255976 bytes
Database Buffers 7046430720 bytes
Redo Buffers 56172544 bytes
Database mounted.
Database opened.
SQL> exit