disk space full alerts on /tmp which is 1GB size and there are no file available or all files available are taking less than 10MB on /tmp.

To free up the space on /tmp we have used below command to identify which process are taking space on /tmp. and restarted the process will free up the space on /tmp.

$lsof|grep -i wasadm|grep -i deleted

the above command lists all the open files and unmapped process using /tmp space and running with wasadm user.