问题：
         利用dbca新建数据库后，关闭数据库，再重启，
         结果出现错误：ORA-00845: MEMORY_TARGET not supported on this system

原因：
         官方文档解释
          Starting with Oracle Database 11g, the Automatic Memory Management feature requires more shared
          memory (/dev/shm)and file descriptors. The size of the shared memory should be at least the greater of
          MEMORY_MAX_TARGET and MEMORY_TARGET for each Oracle instance on the computer. If
          MEMORY_MAX_TARGET or MEMORY_TARGET is set to a non zero value, and an incorrect size is assigned
          to the shared memory, it will result in an ORA-00845 error at startup.

         简单来说就是 MEMORY_MAX_TARGET 的设置不能超过 /dev/shm 的大小：

解决（一）修改shm大小：
1    [oracle@FWDB FWDB]$ df -h | grep shm
2    tmpfs                 2.0G     0 2.0G   0% /dev/shm

马上把它加大：
1    [root@FWDB ~]# cat /etc/fstab | grep tmpfs
2    tmpfs /dev/shm tmpfs   defaults,size=4G 0 0

现在可以通过重启使这个配置生效，也可以通过重新挂载来修改其大小：
1    [root@FWDB ~]# mount -o remount,size=4G /dev/shm
2    [root@FWDB ~]# df -h | grep shm
3    tmpfs 4.0G     0 4.0G   0% /dev/shm

解决（二）

vi /etc/fstab

修改tmpfs /dev/shm tmpfs defaults,size=1G 0 0

fuser -km /dev/shm(设备名) 杀掉占用此设备的程序方可卸载

umount /dev/shm

mount /dev/shm

ITPub博客

(转)ORA-00845: MEMORY_TARGET not supported on this system

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