Increase the size of /dev/shm

To increase the size of /dev/shm for oracle, please perform below steps

Add entry like below on /etc/fstab to make /dev/shm size 10GB

udev        /dev/shm   tmpfs          noauto,size=10g       0 0

Unmount and mount /dev/shm or reboot the server .

umount /dev/shm
mount /dev/shm

Check the size of /dev/shm

lnxsrv:~ # df -h /dev/shm
Filesystem      Size  Used Avail Use% Mounted on
udev             10G     0   10G   0% /dev/shm
lnxsrv:~ #