Oracle Working with tablesapce and datafile

create tablespace
   users
datafile
   '/ora01/oracle/oradata/booktst_users_01.dbf'
size
   50m
autoextend on
next 10m
maxsize 100m;

alter database datafile 'E:\oracle\product\10.2.0\oradata\orcl\ADSL_01.DBF' autoextend on next 100m maxsize 15G

ALTER DATABASE DATAFILE '/path/to/data/file/name' RESIZE 200M;

ALTER TABLESPACE ADSL
   ADD DATAFILE 'E:\oracle\product\10.2.0\oradata\orcl\ADSL_02.DBF' SIZE 100M autoextend on next 300M maxsize unlimited;