How to enable block change tracking in oracle database ?

 [oracle@orcl 2025_05_21]$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Sat May 24 13:01:35 2025

Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to:

Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production

Version 19.3.0.0.0

SQL>

SQL>

SQL> SELECT status, filename FROM v$block_change_tracking;

STATUS     FILENAME

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

DISABLED

SQL>

SQL>

SQL> select filename form v$datafile;

select filename form v$datafile

                     *

ERROR at line 1:

ORA-00923: FROM keyword not found where expected

SQL> select name from v$datafile;

NAME

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

/u01/app/oracle/oradata/DB1/system01.dbf

/u01/app/oracle/oradata/DB1/sysaux01.dbf

/u01/app/oracle/oradata/demo1/undotbs01.dbf

14 rows selected.

SQL> alter database enable block change tracking using file '/u01/app/oracle/block_change_tracking.f';

Database altered.

SQL> select * from v$block_change_tracking ;

STATUS     FILENAME                            BYTES     CON_ID

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

ENABLED    /u01/app/oracle/block_change_t   11599872          1

           racking.f

SQL>