to reload a database listener(stop and restart without disrupting the service):
lsnrctl>reload listener_name
set in the $ORACLE_HOME/network/admin/sqlnet.ora, in the server side SQLNET.EXPIRE_TIME=10 (10 minutes, for example). With this parameter in place, after 10 minutes of inactivity, the server send a small 10 bytes probe packet to the client. If this packet is not acknowledge, the connection will be closed and the associated resources will be released.
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