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    Oracle Error ORA-12523: TNS:listener could not find instance appropriate for the client connection

    admin November 15, 2022 No Comments

    Oracle Error Message

    ORA-12523: TNS:listener could not find instance appropriate for the client connection

    Reason for the Error

    The listener could not find any available (database) instances, that are appropriate for the client connection.

    Solution

    Run “lsnrctl services” to ensure that the instance(s) are registered with the listener, and have status READY.

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