ORA-03217: invalid option for alter of TEMPORARY TABLESPACE

Issue :   Error while adding another file   to the existing temporary tablespace

  ALTER TABLESPACE temp ADD datafile '<path>/temp.dbf' size 1G reuse;

  ALTER TABLESPACE temp ADD datafile '<path>/temp.dbf' size 1G reuse
  *
   ERROR at line 1: ORA-03217: invalid option for alter of TEMPORARY TABLESPACE

Solution :

                you need to use the TEMPFILE clause, not the DATAFILE clause when working with temporary tablespaces, otherwise you will receive the error ORA-03217

         ALTER TABLESPACE temp ADD TEMPFILE  '<path>/temp.dbf'  size 1G reuse;