启动数据库，报错
idle> startup
ORA-00845: MEMORY_TARGET not supported on this system原因
/dev/shm的值必须大于或等于memory_target、memory_max_target的值
查看初始化参数文件中memory_target的大小
[oracle@prod1 dbs]$ cat initPROD.ora |grep memory
*.memory_target=1200m查看临时文件系统的大小
[root@prod1 trace]# df -h /dev/shm/
Filesystem Size Used Avail Use% Mounted on
tmpfs 1014M 0 1014M 0% /dev/shm解决办法
1 提高/dev/shm/
#卸载
[root@prod1 trace]# umount /dev/shm/
umount: /dev/shm: device is busy
umount: /dev/shm: device is busy
#如果卸载失败，杀掉占用该文件系统的进程
[root@prod1 trace]# fuser -km /dev/shm/
#提高大小
[root@prod1 ~]# vi /etc/fstab
tmpfs /dev/shm tmpfs defaults,size=1500m 0 0
#重新加载文件系统
[root@prod1 ~]# mount /dev/shm
#重启数据库
idle> startup
ORACLE instance started.
Total System Global Area 1255473152 bytes
Fixed Size 1336232 bytes
Variable Size 889195608 bytes
Database Buffers 352321536 bytes
Redo Buffers 12619776 bytes
Database mounted.
Database opened.2 降低memory_target、memory_max_target的值
