查看oracle数据库运行多长时间

select to_char(startup_time,'DD-MON-YYYY HH24:MI:SS') started_at,
TRUNC(sysdate - (startup_time))||'day(s),'||TRUNC(24*((sysdate-startup_time) -TRUNC(sysdate-startup_time)))
||'hour(s),'||MOD(TRUNC(1440*((SYSDATE-startup_time)-
TRUNC(sysdate-startup_time))),60)
||'minutes(s),'||MOD(TRUNC(86400*((SYSDATE-STARTUP_TIME)-
TRUNC(SYSDATE-startup_time))),60)
||'seconds' uptime
from v$instance;

oracle10201运行198天产生的bug
http://linux.chinaunix.net/techdoc/database/2008/04/03/988967.shtml