Oracle database error code ORA-12509 – TNS:listener failed to redirect client to service handler

Oracle Database Error Code ORA-12509 Description :
TNS:listener failed to redirect client to service handler
Error Cause:
The dispatcher terminated unexpectedly

How to Solve :
Attempt to connect again and if the same error occurs, contact the DBA to check the state of the dispatchers for this SID. If the problem persists, turn on tracing in the listener to determine the TNS error caused by the redirect.


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