DB Link no longer functions as plug-in database

We have recently updated our data base from 11g to 12 c (I did not upgrade itself). Subsequently, the database was transformed into a snap-in database. Then, we noticed objects which relied on the db links have become invalid objects. We tried using the db and found links to now use the full name (with domain) otherwise it won't work (ORA-02019: description of the connection to the remote database not found). This was never a problem and confirmed on other environments that have not been upgraded. We are still new for Multitenant Architecture and our SR with Oracle did not lead to a solution. Parameters are the same and DB_DOMAIN is identical in both environments. When we ask for Global_name however, the field is not attached to it. We hope that someone has had a similar problem and can guide us in the right direction. Add NAMES of . Domaine_par_defaut to the SQLNET. ORA file made no difference. The question arises when it is converted to a PDB file. Any thoughts are greatly appreciated.

select sysdate from dual@remote_db;

SYSDATE 
--------- 
21-JAN-16 

--After cdb conversion 

select sysdate from dual@remote_db;
* 
ERROR at line 1: 
ORA-02019: connection description for remote database not found

Thanks for the help and the everyone entry. The solution ended up being very simple, I'm embarrassed to say. Once we made the change below the global_names parameter, the dblinks worked as before. Here is the note of the Support of Oracle for reference:

Rename and rename Clause

This clause is used to change the overall name of the PDB. The new global name must be unique within the CBD. For an Oracle Real Application Clusters (Oracle RAC) database, the PDB must be open in READ WRITE SELECT mode on the current instance only. The PDB must be closed on other cases. For the complete semantics of this clause, see 'RENAME GLOBAL_NAME Clause' in the documentation of ALTER DATABASE.

Note:

When you change the global name of a PDB file, remember to change the DATABASE property connectable to basic services of data that are used to connect to the PDB.

Please see the Oracle document:

https://docs.Oracle.com/database/121/SQLRF/statements_2008.htm#SQLRF55667

https://docs.Oracle.com/database/121/SQLRF/statements_1006.htm#SQLRF00802

Change the global database name: example

The following statement changes the global name of the database and includes the name of the database and the domain:

ALTER DATABASE

RENAME GLOBAL_NAME to demo.world.example.com;

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