12c: USE_SID_AS_SERVICE_listener_name This is an off-site link.  Please review our Terms of Service for additional information.

(Anju Garg) In an Oracle 12c container database, the client must specify a service name in order to connect to the PDB. Many Database clients with earlier releases of Oracle Database might have hard-coded connect descriptors to use SID to connect to the database. Now if they choose to plug in their non-CDB’s into a CDB, they will have to modify the connect descriptors in tnsnames.ora on all the client sites.

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