SQL> select file_id,tablespace_name,file_name,bytes/(1024*1024) as MB from dba_data_files where tablespace_name like 'TEST_T%';

   FILE_ID TABLESPACE_NAME FILE_NAME                                        MB

---------- --------------- ---------------------------------------- ----------

         7 TEST_TAB        /home/Oracle/oracle/oradata/mdsp/test_ta         20

                           b.dbf

SQL> alter database datafile '/home/oracle/oracle/oradata/mdsp/test_tab.dbf' resize 21 m;

Database altered.

SQL> select file_id,tablespace_name,file_name,bytes/(1024*1024) as MB from dba_data_files where tablespace_name like 'TEST_T%';

   FILE_ID TABLESPACE_NAME FILE_NAME                                        MB

---------- --------------- ---------------------------------------- ----------

         7 TEST_TAB        /home/oracle/oracle/oradata/mdsp/test_ta         21

                           b.dbf

SQL>  alter tablespace test_tab add datafile '/home/oracle/oracle/oradata/mdsp/test_tab1.dbf' size 20 m;

Tablespace altered.

SQL> select file_id,tablespace_name,file_name,bytes/(1024*1024) as MB from dba_data_files where tablespace_name like 'TEST_T%';

   FILE_ID TABLESPACE_NAME FILE_NAME                                        MB

---------- --------------- ---------------------------------------- ----------

         7 TEST_TAB        /home/oracle/oracle/oradata/mdsp/test_ta         21

                           b.dbf

         8 TEST_TAB        /home/oracle/oracle/oradata/mdsp/test_ta         20

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