Oracle – Disable dbms gather_stats_job or optimizer stats

To disable gather_stats_job in 10g:

BEGIN
DBMS_SCHEDULER.DISABLE('GATHER_STATS_JOB');
END;
/

To disable gather_stats_job (also known as optimizer stats) in 11g:

BEGIN
DBMS_AUTO_TASK_ADMIN.DISABLE(
client_name => 'auto optimizer stats collection',
operation => NULL,
window_name => NULL);
END;
/