ORA-01652: Extend a tablespace in Oracle 12c, no DBA_DATA_FILES table I know that there are other questions about this topic but reading and trying them they cannot solve my problem. Mainly because select * from DBA_DATA_FILES; shows me an error when executing, because the table doesn't exist in the database.

I know the different tablespaces using the following query, also looking not standard :

SELECT * FROM USER_TABLESPACES;


The ORA error ORA-01652 was thrown when executing a request which should use many temporary space.

The tablespace which have the problem is R1XQDTM1. Below the tablespace info : 

The problem is that i don't know the datafiles location for this tablespace to execute the solution request ALTER TABLESPACE ADD DATAFILE
EDIT/ !!! Now i see you wrote this:


  Mainly because select * from DBA_DATA_FILES; shows me an error when
  executing, because the table doesn't exist in the database.


In my opinion you just don't have enought rights. You should login as sysdba.

Use this select first, you should see location of datafiles (Change the "EXAMPLE" at the end of this command):

select file_name, AUTOEXTENSIBLE, round(BYTES/1024/1024,1), round(MAXBYTES/1024/1024,1), INCREMENT_BY, INCREMENT_BY/1024  from dba_data_files where tablespace_name='EXAMPLE';


Then add datafile to Tablespace, for example:

alter tablespace EXAMPLE add datafile '/oracle/data/EXAMPLE02.dbf' size 100m autoextend on next 100m maxsize unlimited;