ORA-00845: MEMORY_TARGET not supported on this system
This error happen when system is running out of temporary storage. While starting up the database oracle uses /dev/shm to store temporary files but when it runs out of memory you will get this error MEMORY_TARGET not supported on this system.
In My case:
MEMORY_TARGET=1000M and /dev/shm is 584M
[oracle@localhost ~]$
[oracle@localhost ~]$
[oracle@localhost ~]$ sqlplus "/as sysdba"
star
SQL*Plus: Release 11.2.0.4.0 Production on Tue Feb 6 22:14:11 2018
Copyright (c) 1982, 2013, Oracle. All rights reserved.
tup
Connected to an idle instance.
SQL> ORA-00845: MEMORY_TARGET not supported on this system
SQL> exit
Disconnected
[oracle@localhost ~]$
[oracle@localhost ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 26G 24G 1.5G 95% /
tmpfs 584M 72K 584M 1% /dev/shm
/dev/sda1 477M 55M 397M 13% /boot
[oracle@localhost ~]$
[oracle@localhost ~]$
[root@localhost ~]#
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 26G 24G 1.5G 95% /
tmpfs 584M 72K 584M 1% /dev/shm
/dev/sda1 477M 55M 397M 13% /boot
[root@localhost ~]#
To increase the size
[root@localhost ~]# mount -o remount,size=1G /dev/shm
[root@localhost ~]#
Verify the size
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 26G 24G 1.5G 95% /
tmpfs 1.0G 72K 1.0G 1% /dev/shm
/dev/sda1 477M 55M 397M 13% /boot
[root@localhost ~]#
To make permanent changes to your file system update your fstab file
[root@localhost ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Dec 19 18:20:28 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=a0d50c7a-876c-4d10-ae50-3caf8cbe182a /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
[root@localhost ~]#
[root@localhost ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Dec 19 18:20:28 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=a0d50c7a-876c-4d10-ae50-3caf8cbe182a /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults,size=1G 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
[root@localhost ~]#
Update the new fstab file ,mount -a command to immediate mount all disk defined in /etc/fstab file
root@localhost ~]#
[root@localhost ~]# mount -a
[root@localhost ~]#
[root@localhost ~]#
[oracle@localhost ~]$ sqlplus "/as sysdba"
SQL*Plus: Release 11.2.0.4.0 Production on Tue Feb 6 22:35:35 2018
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 1043886080 bytes
Fixed Size 2259840 bytes
Variable Size 654312576 bytes
Database Buffers 381681664 bytes
Redo Buffers 5632000 bytes
Database mounted.
Database opened.
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
memory_max_target big integer 1000M
memory_target big integer 1000M
parallel_servers_target integer 16
pga_aggregate_target big integer 0
sga_target big integer 0
SQL>
verify /dev/shm after reboot OS:
[oracle@localhost ~]$
[oracle@localhost ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 26G 24G 1.5G 95% /
tmpfs 1.0G 0 1.0G 0% /dev/shm
/dev/sda1 477M 55M 397M 13% /boot
[oracle@localhost ~]$
