/usr/sbin/lsof | grep deleted
ora 25575 data 33u REG 65,65 4294983680 31014933 /oradata/DATAPRE/file.dbf (deleted)
file /proc/25575/fd/33
/proc/25575/fd/33: broken symbolic link to `/oradata/DATAPRE/file.dbf (deleted)'
echo > /proc/25575/fd/33