disable daily nightly automatic statistics gathering job in oracle 10g

Disable and enable daily nightly automatic statistics gathering job in oracle 10g:

SELECT * FROM DBA_SCHEDULER_JOBS WHERE JOB_NAME = 'GATHER_STATS_JOB';

Disable:

BEGIN
  DBMS_SCHEDULER.disable('GATHER_STATS_JOB');
END;
Enable:

BEGIN
DBMS_SCHEDULER.enable('GATHER_STATS_JOB');
END;
Query how much table data has changed daily:

exec DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO
select * from  DBA_TAB_MODIFICATIONS where table_owner='user1'