ORA-00845: MEMORY_TARGET not supported on this system

SQL> ALTER SYSTEM SET SGA_TARGET=8G scope=spfile;

System altered.

SQL> alter system set SGA_MAX_SIZE=8G scope=spfile;

System altered.

SQL> startup nomount
ORA-01078: failure in processing system parameters
ORA-00838: Specified value of MEMORY_TARGET is too small, needs to be at least 7184M
SQL> exit

SQL> alter system set memory_target=8208M scope=spfile;

System altered.

SQL> alter system set memory_max_target=8208M scope=spfile;

System altered.

SQL> startup nomount
ORA-00845: MEMORY_TARGET not supported on this system
SQL> exit
Disconnected


$ df -h |grep /dev/shm
Filesystem            Size  Used Avail Use% Mounted on
tmpfs                 7.4G  176M  7.2G   3% /dev/shm

FIX:-

$ mount -o remount,size=9G /dev/shm


$ df -h |grep /dev/shm
Filesystem            Size  Used Avail Use% Mounted on
tmpfs                 9.0G  8.2G  851M  91% /dev/shm


SQL> show parameter sga;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
lock_sga                             boolean     FALSE
pre_page_sga                         boolean     FALSE
sga_max_size                         big integer 8G
sga_target                           big integer 8G