SYSTEM Table Space size is too large

[rotem_fo]

Hi,
Check for segments that does not belong to SYS/SYSTEM schema but reside in SYSTEM tablespace and move them to designated tablespaces:

select owner, segment_type, segment_name
from dba_segments
where owner not in ('SYS','SYSTEM')
and tablespace_name = 'SYSTEM';

For each table, simply move to other tablespace using
alter table tab_name move tablespace ts_name storage (...

for each index, you can rebuild it using:
alter index ind_name rebuild tablespace ts_name storage (...

Cheers,
R.