Change ORACLE SID

select name from v$database;
select instance_name from v$instance;
shutdown immediate;
C:\>set ORACLE_SID=sidorcl
C:\>net stop oracleservicesidorcl
C:\>ORADIM -DELETE -SID sidorcl
C:\>set ORACLE_SID=sidorclnew
C:\>ORAPWD FILE=c:\oracle\product\10.1.0\db_1\database\pwdsidorclnew.ora PASSWORD=oracle ENTRIES=5 FORCE=y
C:\>ORADIM -new -sid sidorclnew -startmode manual -spfile
C:\>oradim -edit -sid sidorclnew -startmode auto
C:\>rename c:\oracle\product\10.1.0\db_1\database\initSIDORCL.ORA initsidorclnew.ORA
C:\>sqlplus/nolog
conn sys as sysdba
create spfile from pfile;
startup
select name from v$database;
select instance_name from v$instance;