SELECT filename, status, bytes
FROM v$block_change_tracking;

DISABLED

SQL> show parameter large_pool;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
large_pool_size                      big integer 0

SQL> select ISSYS_MODIFIABLE from v$parameter where name='large_pool_size';
ISSYS_MOD
---------
IMMEDIATE

SQL> select ISSYS_MODIFIABLE from v$parameter where name='large_pool_size';

ISSYS_MOD
---------
IMMEDIATE

alter system set large_pool_size=128M scope=spfile

issys_modifiable = IMMEDIATE/DEFERRED/FALSE indicates if the value can be modified by alter system command. Values represents when the changes takes effect. For immediate, no matter what you use (spfile or init file ) parameter change takes effect immediately.For deferred, parameter can be changed but change takes affect in subsequent sessions not for currently established sessions. For false it means parameter cannot be changed if you dont have a spfile.

alter system set large_pool_size=128M scope=spfile