Free up oracle db space by delete below log:-
/oracle/oracle/product/10.2.0/db_1/network/log/listener.log
using this command :
cat /dev/null > /oracle/oracle/product/10.2.0/db_1/network/log/listener.log
This log was more than 4GB of size. Emptying this file is harmless as it only contains the connection log to the DB.
