如何修改数据库名(ORACLE)

1.用oracle自带的工具nid改数据库名
在本例中，假设原来的数据库名为test,要改成testdb,原实例名(service_name,instance_name)test,要改成testdb.
nid是自带的工具，在oracle_home/bin目录中.以下方法假设登陆到数据库本机做。
1.1 sqlplus "sys/password as sysdba"
1.2 sql>shutdown immediate --先停掉数据库
1.3 sql>startup mount --nid需要在mount状态下才能做。
1.4sql>host nid target=sys/password dbname=new_dbname --nid是一个在操作系统下执行的命令，在sqlplus环境中用host 去调用操作系统环境下的命令。命令中，当你想将数据库名字改为TESTDB时，应写成dbname=testdb
1.5执行后程序会询问：
Change database ID and database name TEST to TESTDB? (Y/[N]) =>y
敲y确定。
之后程序会对控制文件，数据文件进行修改：
Control File C:ORACLEORADATATESTCONTROL01.CTL - modified
Control File C:ORACLEORADATATESTCONTROL02.CTL - modified
Control File C:ORACLEORADATATESTCONTROL03.CTL - modified
Datafile C:ORACLEORADATATEST YSTEM01.DBF - dbid changed, wrote new name
Datafile C:ORACLEORADATATESTUNDOTBS01.DBF - dbid changed, wrote new nam
Datafile C:ORACLEORADATATESTINDX01.DBF - dbid changed, wrote new name
Datafile C:ORACLEORADATATESTTOOLS01.DBF - dbid changed, wrote new name
Datafile C:ORACLEORADATATESTUSERS01.DBF - dbid changed, wrote new name
Datafile D:DATAFILEPORMALS_SPA.DBF - dbid changed, wrote new name
Datafile C:ORACLEORADATATESTOEM_REPOSITORY.DBF - dbid changed, wrote ne
name
Datafile D:DATAFILEPORMALS_SPA_01.DBF - dbid changed, wrote new name
Datafile C:ORACLEORADATATESTTEMP01.DBF - dbid changed, wrote new name
Control File C:ORACLEORADATATESTCONTROL01.CTL - dbid changed, wrote new
name
Control File C:ORACLEORADATATESTCONTROL02.CTL - dbid changed, wrote new
name
Control File C:ORACLEORADATATESTCONTROL03.CTL - dbid changed, wrote new
name
Database name changed to TESTDB.
Modify parameter file and generate a new password file before restarting.
Database ID for database TESTDB changed to 2321050327.
All previous backups and archived redo logs for this database are unusabl