Running more than one instance of the database on oracle 9i

I have a oracle 9i database on linux 8 . I had created a database db1 . Its working fine
then i created another database db2 on the same server.
When i am trying to start the database with the command
sqlplus /nolog
sql> set instance db2
it gives error sid coudn't be found.
How can i resolve it. My other database is running fine at startup also.
Is there any modification needed in startscript to start this database also

Hi
the SID is an environment variable, so try:
at the unix-prompt:
$ ORACLE_SID=DB2
$ export ORACLE_SID
$ sqlplus /nolog
SQL> connect / as sysdba
getting:
SQL> connected to an idle instance
and now
SQL> startup
regards
Roman

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