SQL> select instance_name, host_name, version,
2 startup_time, round(sysdate-startup_time) "Days Up",
3 status from v$instance;
INSTANCE_NAME
----------------
HOST_NAME
----------------------------------------------------------------
VERSION STARTUP_T Days Up STATUS
----------------- --------- ---------- ------------
xe
UBC-1
10.2.0.1.0 26-OCT-09 0 OPEN
SQL>