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ORA-03113: End-of-File on Communication Channel – Complete Oracle DBA Troubleshooting Guide

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ORA-03113: End-of-File on Communication Channel – Complete Oracle DBA Troubleshooting Guide Published: May 2026 Last Updated: October 2026 Reading Time: 18–22 Minutes Applies To: Oracle Database 11g, 12c, 18c, 19c, 21c, Oracle Database 23ai, Oracle RAC, Oracle Data Guard, Oracle Client, SQL*Plus, RMAN, Oracle Net Services and Oracle E-Business Suite The ORA-03113: end-of-file on communication channel error indicates that communication between an Oracle client and the Oracle server process was unexpectedly broken. It is one of the most important Oracle Database communication errors because the message itself usually does not identify the actual root cause. ORA-03113 should therefore be treated as a symptom rather than the underlying failure . The real problem may be an Oracle server-process termination, database instance outage, Oracle internal error, operating-system failure, storage or I/O problem, network interruption, firewall timeout, RAC node failu...
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