Modify the entry in “/etc/fstab” to have persistent settings between reboot of your machine. Here shared segments are set to 3500M.
tmpfs /dev/shm tmpfs size=3500M 0 0remount it
mount -o remount tmpfs
and verify
mount | grep tmpfs tmpfs on /dev/shm type tmpfs (rw,size=3500M)
to see what is using shared segments run following command
[oracle@oel7 ~]$ ipcs -m ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 158433298 oracle 640 4096 0 0x00000000 158466067 oracle 640 4096 0 0x00000000 158498836 oracle 640 4096 0 0x9d984658 158531605 oracle 640 12288 49
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