bug: MEMORY_TARGET not supported on this system
SQL> startup open;
ORA-00845: MEMORY_TARGET not supported on this system

解决方案：原因是/dev/shm 必须大于 MEMORY_TARGET。

$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 635M 1.2G 35% /dev/shm
tmpfs 1.9G 9.2M 1.8G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/ol-root 10G 3.9G 6.2G 39% /
/dev/sda1 397M 199M 198M 51% /boot
/dev/mapper/ol-home 3.0G 58M 3.0G 2% /home
/dev/mapper/ol-u01 30G 18G 13G 58% /u01
/dev/mapper/ol-tmp 3.0G 59M 3.0G 2% /tmp
vmhgfs-fuse 159G 133G 27G 84% /mnt/hgfs
tmpfs 370M 0 370M 0% /run/user/54322
tmpfs 370M 16K 370M 1% /run/user/42
tmpfs 370M 0 370M 0% /run/user/54321
tmpfs 370M 0 370M 0% /run/user/0

通过如下命令解决即可

mount -o size=2560m /dev/shm