Running Mulitple instances concurrently

I have installed oracle 8.1.7 on windows 2000 Advanced server. I have created two instances and appropriate listener files for these instances. However I cannot run these two instances concurrently. at any point of time only one can run.
I have to switch back and forth between two instances , whereas my requirement is to have both instances running con currently.
Anyone please help to resolve this.
Thanks in Advance.
Srini

hey! if you are sure you have install two instances successfully, then you can always have both of them running concurrently.
lets assume the two instane names are oracle1 & oracle2 respectively
Make sure that the databases are registered correctly with the listener.check the "listener.ora" in your 'orahome\network\admin folder. Also verify the connect descriptor for the databases in your "tnsnames.ora file" also in the same directory....
If all check is successful then you can attempt starting up the instances../
C:\>set oracle_sid=oracle1
C:\>sqlplus/nolog
SQL>conn / as sysdba
If you recieve a reply of connected, then you are connected to oracle1
ELSE ("you recieve connected to an idle instance") then type:
SQL>startup and the instance will be started.
when the instance is started and you are sucessfully connected as a sysdba, then type:
SQL>conn /@oracle2 as sysdba (If you get "connected to an idle instance", then the instance isn't started, Type:
SQL>startup
the instance will start and try to mount corresponding database.
Remember, in future whenever you want to connect to database 'oracle2', you will have to type:
SQL> conn /@oracle2 as sysdba
OR
SQL>host set oracle_sid=oracle2
SQL>conn / as sysdba
Now your defoult SID has become oracle2.
If you still have problems, mail me [email protected]

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