Renaming/relocating data files is easier in Oracle 12c

Prior to 12c, the process to rename/relocate a data file consisted off

-  taking the tablespace offline
-  renaming the datafiles using OS commands
-  issuing an 
     ALTER TABLESPACE data_01 
           RENAME DATAFILE '/u01/oradata/data_01.dbf' TO '/u02/oradata/data_01.dbf';
-  bring the table space online

With 12c, this is much easier. You can accomplish this with:

ALTER DATABASE MOVE DATAFILE '/u01/oradata/data_01.dbf' TO '/u02/oradata/data_01.dbf';