应用连接不上数据库

思路1

select inst_id, count(*) from gv$session group by inst_id;

select inst_id, count(*) from gv$process group by inst_id;

show parameter session

show parameter process

思路2

select username, profile from dba_profiles where username='&username';

思路3

sqlplus username@password/service_name 或
sqlplus 用户名/密码@连接串名

select * from gv$session where username = '&username';