sysdba登录
sqlplus /nolog
conn /as sysdba
查看用户列表：
SQL> select username,password from dba_users;
USERNAME PASSWORD
------------------------------ ------------------------------
USR_BXDEPT
USR_TEST
USR_BX
USR_MENHU
USR_OA
SPATIAL_WFS_ADMIN_USR
SPATIAL_CSW_ADMIN_USR
HR
APEX_PUBLIC_USER
OE
DIP