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ORA-12514: TNS Listener Does Not Currently Know of Service Requested in Connect Descriptor – Complete Oracle DBA Guide

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ORA-12514: TNS Listener Does Not Currently Know of Service Requested in Connect Descriptor – Complete Oracle DBA Guide Published: May 2026 Last Updated: July 2026 Reading Time: 15 Minutes Applies To: Oracle Database 11g, 12c, 18c, 19c, 21c, 23ai, Oracle RAC, Oracle Data Guard, Oracle Net Services, Oracle Cloud Infrastructure (OCI) The ORA-12514: TNS listener does not currently know of service requested in connect descriptor error is one of the most common Oracle Net Services errors encountered by Oracle Database Administrators, developers, and application administrators. This error occurs when a client successfully reaches the Oracle Listener, but the listener cannot find the requested database service. Unlike network connectivity issues where the listener is unavailable, ORA-12514 indicates that communication with the listener has been established; however, the specified SERVICE_NAME has not been registered or recognized. ORA-12514 commonly appears a...
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