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SQL Developerは、Oracle Database 12cをTNSと接続できますが、基本的な接続はできません。

    PDBに接続するときは、SERVICE名を使用する必要があります。

    SIDはコンテナデータベース専用です。

    特にPDBの操作については、このページを参照してください>

    Service Name. When you create a PDB, Oracle automatically adds it as a service in the listener. You can confirm it by looking at the listener status: 
    
    [[email protected] trace]$ lsnrctl status
    LSNRCTL for Linux: Version 12.1.0.1.0 - Production on 24-FEB-2013 12:20:14
    Copyright (c) 1991, 2013, Oracle. All rights reserved.
    Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
    STATUS of the LISTENER
    ------------------------
    Alias LISTENER
    Version TNSLSNR for Linux: Version 12.1.0.1.0 - Production
    Start Date 19-FEB-2013 21:09:05
    Uptime 4 days 15 hr. 11 min. 9 sec
    Trace Level off
    Security ON: Local OS Authentication
    SNMP OFF
    Listener Parameter File
    /u02/app/oracle/product/12.1.0/grid/network/admin/listener.ora
    Listener Log File
    /u02/app/oracle/diag/tnslsnr/prosrv1/listener/alert/log.xml
    Listening Endpoints Summary...
    (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
    (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=prosrv1.proligence.com)(PORT=1521)))
    Services Summary...
    Service "+ASM" has 1 instance(s).
    Instance "+ASM", status READY, has 1 handler(s) for this service...
    Service "CONA" has 1 instance(s).
    Instance "CONA", status READY, has 1 handler(s) for this service...
    Service "CONAXDB" has 1 instance(s).
    Instance "CONA", status READY, has 1 handler(s) for this service...
    Service "pdb1" has 1 instance(s).
    Instance "CONA", status READY, has 1 handler(s) for this service...
    The command completed successfully
    The service "pdb1" actually points to the PDB called PDB1. It's very important to note that that this is not a service name in initialization parameter of the database, as you can see from the service_names parameter of the database.
    
    SQL> show parameter service
    NAME TYPE VALUE
    ------------------------------------ ----------- ------------------------------
    service_names string CONA
    You can place that service name in an entry in the TNSNAMES.ORA file:
    
    PDB1 =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = prosrv1.proligence.com)(PORT = 1521))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = PDB1)
    )
    )
    Now you can connect to PDB1 using the connect string:
    
    [[email protected] ~]$ sqlplus system/[email protected]
    


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