"Connection timed out", ORA-03113, and "Closed Connection" on Idle Connections

(Doc ID 1060344.1)

Last updated on NOVEMBER 22, 2017

Applies to:

JDBC - Version 10.1.0 and later
Information in this document applies to any platform.


In a production environment, an application runs on a application server and connects to a Oracle database via JDBC 10g or higher (using either JDBC/Thin or JDBC/OCI). The application uses connection pools.

When the application is inactive for a while (typically overnight, but sometimes for shorter periods that are thought to be more than one hour), the following exceptions appear in the application server log:

     java.sql.SQLException: Io exception: Connection timed out
     java.sql.SQLException: ORA-03113: end-of-file on communication channel
     java.sql.SQLException: Closed Connection

Attempts to get a new connection hang.

The issue does not occur in the User Acceptance Test (UAT) and Quality Assurance (QA) environments.




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