Startup issue when having more than one database on machine

Startup issue when having more than one database on machine:
I’ve installed two databases.
When I shutdown one of the database and try to start it up using
Startup pfile=’…location..’;
I get ora-12514: TNS: listener does not currently know of service rquirest in connect descriptor
when I try it again after 3 seconds, I get a new error, ora-01041: internal error. Hostdef extension doesn’t exist
Shutdown and Startup gave no problems when I had one database. Why am I getting problems when I have two databases?
I’m using: show parameter pfile|spfile; to make sure I have the right parameter locations, so the error shouldn’t be from location.
I’ve never installed two databases on one machine, so maybe I’m making a first-timer’s error.
Anyone know how to get this working, i.e. starting and stopping DB without issues?
Using oracle 11gR2 on Windows 7 64bit, all is working normal.
Thanks,
Ayman
Edited by: aymanzone on Jun 15, 2011 9:27 AM

aymanzone wrote:
my oracle_sid is set to the name of one of my databases
echo %oracle_sid%
shows me the name of my first database.
Still not working though.
When I start the services of both databases using Services, I can connect and run queries from both of the database.
Edited by: aymanzone on Jun 15, 2011 11:47 AMFirstly ... the Oracle Service for the instance should be started for the DB you are trying to connect or start.
Next ... from the command prompt:
set oracle_sid=<Instance_Name>
sqlplus sys as sysdba
startup pfile='location of the respective db pfile'
Now, if you want to start or connect to another DB which is on the same server (again assuming the Service is STARTED) ...
From the same command prompt session or other ....
set oracle_sid=<Other_Instance_Name>
sqlplus sys as sysdba
startup pfile='location of the respective db pfile'
Edited by: Srikanth on Jun 16, 2011 12:27 AM

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