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How to access two Database in one server


If you have two databases on the same server, how to  connect in SQL*Plus?
----------
C:\>set ORACLE_SID=orcl

 C:\>echo %oracle_sid%
orcl

C:\>SQLPLUS /NOLOG

SQL*Plus: Release 11.2.0.1.0 Production on Mon Sep 30 12:26:08 2013

 Copyright (c) 1982, 2010, Oracle.  All rights reserved.

 SQL> conn / as sysdba
Connected.
SQL> show user;
USER is "SYS"
SQL>
SQL> select * from global_name;

 GLOBAL_NAME
--------------------------------------------------------------------------------

 ORCL
SQL>

 C:\>set ORACLE_SID=orcl1

 C:\>echo %oracle_sid%
orcl1

C:\>SQLPLUS /NOLOG

SQL*Plus: Release 11.2.0.1.0 Production on Mon Sep 30 12:26:08 2013

 Copyright (c) 1982, 2010, Oracle.  All rights reserved.

 SQL> conn / as sysdba
Connected.
SQL> show user;
USER is "SYS"
SQL>
SQL> select * from global_name;

 GLOBAL_NAME
--------------------------------------------------------------------------------

 ORCL1
SQL>

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