Which three statements are true about connection strings and service names used to connect to
An Oracle database instance?
A.A connection string must include the SID of a database instance. B.A single connection string can refer to multiple database instances C.A connection string including a service name must be defined in the tnsnames. ora file D.A service name is created by a listener E.Different connection strings in the same tnsnames. ora file can contain the same service name正确答案BEF
Host and port parameters F.A single database instance can support connections for multiple service names
