DELETE noprompt ARCHIVELOG ALL COMPLETED BEFORE '(SYSDATE-时间)';
DELETE noprompt ARCHIVELOG UNTIL TIME 'SYSDATE-时间';
DELETE NOPROMPT ARCHIVELOG ALL COMPLETED BEFORE "to_date('2022-03-25:14:59:00','YYYY-MM-DD:hh24:mi:ss')";
保留1天 sysdate -1
保留12小时 sysdate - 1/2
保留1小时 sysdate - 1/24