autoextend off

SQL> alter database datafile '/oracle/oradata/orcl/ant_1.dbf' autoextend off;

Database altered.

SQL> select tablespace_name,file_name,bytes/1024/1024,maxbytes/1204/1024,autoextensible from dba_data_files;

TABLESPACE_NAME                FILE_NAME                                BYTES/1024/1024 MAXBYTES/1204/1024 AUT
------------------------------ ---------------------------------------- --------------- ------------------ ---
USERS                          /oracle/oradata/orcl/users01.dbf                       5         27869.1163 YES
SYSAUX                         /oracle/oradata/orcl/sysaux01.dbf                    270         27869.1163 YES
UNDOTBS1                       /oracle/oradata/orcl/undotbs01.dbf                    25         27869.1163 YES
SYSTEM                         /oracle/oradata/orcl/system01.dbf                    450         27869.1163 YES
ANTY                           /oracle/oradata/orcl/ant_1.dbf                       150                  0 NO

5 rows selected.

SQL> conn sa/oracle
Connected.
SQL> select count(*) from aa;

  COUNT(*)
----------
     11844

SQL> select * from ant_1;

NAME  SE      GRADE
----- -- ----------
li    w          60
ff    m          90

SQL>