Modifying Instance name SID in Oracle

Modifying Instance name SID in Oracle

Modify the ORACLE Instance name

System Environment: CentOS 6.5
ORACLE version: 10.2

1. Check the original database instance name
$ Echo $ ORACLE_SID
Orcl

$ Sqlplus/as sysdba
> Select instance from v $ thread;
INSTANCE
--------------------------------------------------------------------------------
Orcl


2. Shut down the database
> Shutdown immediate;
> Exit;


3. Modify the oracle ORACLE_SID environment variable, for example, from orcl to doiido.
$ Vi/home/oracle/. bash_profile
Export ORACLE_SID = doiido
$ Source/home/oracle/. bash_profile


4. Modify the/etc/oratab file and change the sid Name from orcl to doiido.
$ Vi/etc/oratab
Doiido:/u01/app/oracle/11.2/db_1: Y


5. Go to the $ ORACLE_HOME/dbs directory.
Modify all files whose names contain the original sid to the corresponding new sid
$ Cd $ ORACLE_HOME/dbs
$ Mv hc_zf.dat hc_doiido.dat
$ Mv lkZF lkDOIIDO
$ Mv orapwzf orapwdoiido
$ Mv spfilezf. ora spfiledoiido. ora


6. Rebuild the password file
Because the password file cannot be used in the new instance after it is renamed
$ Orapwd file = $ ORACLE_HOME/dbs/orapw $ ORACLE_SID password = 123456 entries = 5 force = y


7. Start the database
$ Sqlplus/as sysdba
> Startup
8. Check the database instance name
Check the database instance name using the following statement and find that the Instance name has changed from orcl to doiido.
> Select instance from v $ thread;
INSTANCE
--------------------------------------------------------------------------------
Doiido

At this time, although the Instance name has been changed to doiido, the Database Name (dbname) is still orcl, so the connection still cannot be established on the client. to connect, You need to modify the dbname