Hi Dear,
I had Oracle10G database (Database Name "ORCL") by DBCA and again another ones I create a Database by manually (Database Name "Neeraj")
When I Open the database then by default ORCL database has been opened.
and for open the Neeraj Database every time we set
SET ORACLE_SID=Neeraj
Please support to me What i do, When I open the database by default Neeraj database has been open.

Regards,
Neeraj Singh