Linux Partitions - tmpfs

Question

We have installed oracle linux 5.x using the custom partitioning and the OS installation was successfully completed and we were able to access the Linux OS without any issues.
But, while observing the /etc/fstab file, it has an additional partition entry which we have not created during the custom partition.
Why this below partition was created and purpose:
tmpfs /dev/shm tmpfs defaults 0 0
# cat /etc/fstab
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/u01 /u01 ext3 defaults 1 2
LABEL=/usr /usr ext3 defaults 1 2
LABEL=/var /var ext3 defaults 1 2
LABEL=/tmp /tmp ext3 defaults 1 2
LABEL=/swap /swap ext3 defaults 1 2
LABEL=/boot /boot ext3 defaults 1 2
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
/dev/VolGroup00/LogVol01 swap swap defaults 0 0
[root@nfs-stg-db1 ~]#
Becuse of this OS additional partition the Oracale Database Alert Log file reporting ORA-07445 errors.
Please advise.

Answer 1

Thanks for your respose..
But we have commented this line in /etc/fstab file and re-booted the machine. Then restared the oracle database and the application without any issues and we are not receiving the ORA-07445 errors in database alert log file. Please check the oracle metalink note ID 1191471.1
#tmpfs /dev/shm tmpfs defaults 0 0
and now applicaiton is working fine without any issues.
Cause
You have set additional mount options on the shared memory device, /dev/shm, other than just the option named defaults.
Solution
If you see any other mount options in file /etc/fstab after the word "defaults" for /dev/shm,
such as nosuid, nodev, or noexec:
none /dev/shm tmpfs defaults,nosuid,nodev,noexec 0 0
then remove these options from the entry in /etc/fstab:
none /dev/shm tmpfs defaults 0 0
shut down the database instance, and reboot the system. Restart the database instance. The errors should no longer appear.
After executing the above action plan the issue has been resolved.
But our concern is, what this partition and why its created automaticall? if this partition is created automatically, it should also handle the oracle database.
Appreciate your advice.