In Oracle 19c, the classic Dead Connection Detection (DCD) mechanism, configured via expire_time in sqlnet.ora , remains the most reliable way to solve this.
lsnrctl stop lsnrctl start Check an active session’s DCD setting: expire_time sqlnet.ora 19c
The value is in . A setting of 10 means the server will send a probe every 10 minutes. 3. Restart Listener (Not Required, but Recommended) Actually, sqlnet.ora changes take effect for new connections only . Existing sessions will not inherit the new setting. In Oracle 19c, the classic Dead Connection Detection
One of the most frustrating issues for any DBA or application owner is the dreaded "hung session" — a database connection that appears active but is actually dead due to a network failure, firewall timeout, or client crash. In Oracle 19c