參考：
https://blog.csdn.net/iteye_14608/article/details/82162620
--操作環境
redhat 7.5
oracle 11.2.0.4
--數據庫名稱
原sid和dbname: testdbutf8
新sid和dbname: testdb2
#######步驟一：修改數據庫sid#######
1、關庫
sqlplus / as sysdba
shutdown immediate;
exit
2、修改/etc/oratab文件,替換所有sid爲testdb2
vi /etc/oratab
testdb2:/u01/app/oracle/product/11.2.0/db_1:N
3、修改bash_profile,替換所有sid爲testdb2
vi /home/oracle/.bash_profile
export ORACLE_SID=testdb2
source .bash_profile
4、修改數據庫參數文件名稱
cd $ORACLE_HOME/dbs
mv hc_testdbutf8.dat hc_testdb2
mv inittestdbutf8.ora inittestdb2.ora
mv lkTESTDBUTF8 lkTESTDB2
mv orapwtestdbutf8 orapwtestdb2
mv spfiletestdbutf8.ora spfiletestdb2.ora
[oracle@testdb-utf8 dbs]$ ll
total 28
-rw-rw---- 1 oracle oinstall 1544 May 22 14:03 hc_testdb2.dat
-rw-r--r-- 1 oracle oinstall 2851 May 15 2009 init.ora
-rw-r--r-- 1 oracle oinstall 1316 May 22 13:54 inittestdb2.ora
-rw-r----- 1 oracle oinstall 24 May 22 09:09 lkTESTDB2
-rw-r----- 1 oracle oinstall 2048 May 22 11:27 orapwtestdb2
-rw-r----- 1 oracle oinstall 3584 May 26 04:00 spfiletestdb2.ora
5、重新生成密碼文件
orapwd file=$ORACLE_HOME/dbs/orapw$ORACLE_SID password=sys entries=5 force=y
6、啓動並登陸數據庫，查看實例名稱
sqlplus / as sysdba
startup
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
testdb2
########步驟二：修改數據庫dbname #######
1、接上一步驟，備份控制文件
alter database backup controlfile to trace resetlogs;
2、關庫
shutdown immediate;
exit
3、進入控制文件備份目錄
cd /u01/app/oracle/diag/rdbms/testdb2/testdb2/trace/
tail -200 alert_testdb2.log
找到下面這句話：
alter database backup controlfile to trace resetlogs
Backup controlfile written to trace file /u01/app/oracle/diag/rdbms/testdbutf8/testdb2/trace/testdb2_ora_20847.trc
Completed: alter database backup controlfile to trace resetlogs
4、複製一份備份文件
cp testdb2_ora_20847.trc testdb2.sql
5、編輯testdb2.sql
去掉多餘部分，替換所有testdbutf8爲testdb2
把CREATE CONTROLFILE REUSE 改爲 CREATE CONTROLFILE SET
註釋掉 --RECOVER DATABASE USING BACKUP CONTROLFILE
最終結果如下：
vi testdb2.sql
STARTUP NOMOUNT
CREATE CONTROLFILE SET DATABASE "TESTDB2" RESETLOGS NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
LOGFILE
GROUP 1 '/oradata/datafile/testdb2/redo01.log' SIZE 500M BLOCKSIZE 512,
GROUP 2 '/oradata/datafile/testdb2/redo02.log' SIZE 500M BLOCKSIZE 512,
GROUP 3 '/oradata/datafile/testdb2/redo03.log' SIZE 500M BLOCKSIZE 512,
GROUP 4 '/oradata/datafile/testdb2/redo04.log' SIZE 500M BLOCKSIZE 512,
GROUP 5 '/oradata/datafile/testdb2/redo05.log' SIZE 500M BLOCKSIZE 512
DATAFILE
'/oradata/datafile/testdb2/system01.dbf',
'/oradata/datafile/testdb2/sysaux01.dbf',
'/oradata/datafile/testdb2/undotbs01.dbf',
'/oradata/datafile/testdb2/users01.dbf'
CHARACTER SET AL32UTF8
;
--RECOVER DATABASE USING BACKUP CONTROLFILE
ALTER DATABASE OPEN RESETLOGS;
ALTER TABLESPACE TEMP ADD TEMPFILE '/oradata/datafile/testdb2/temp01.dbf'
SIZE 61865984 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M;
6、生成pfile
sqlplus / as sysdba
create pfile='?/dbs/inittestdb2.ora' from spfile;
7、修改目錄
--閃回恢復區
cd /u01/app/oracle/fast_recovery_area
mv testdbutf8 testdb2
mv TESTDBUTF8 TESTDB2
--數據文件目錄
cd /oradata/datafile
mv testdbutf8 testdb2
--日誌文件目錄
cd /u01/app/oracle/diag/rdbms
mv testdbutf8 testdb2
cd /u01/app/oracle/admin
mv testdbutf8 testdb2
8、備份老控制文件
cd /oradata/datafile/testdb2
mv control01.ctl control01.ctl.bak
cd /u01/app/oracle/fast_recovery_area/testdb2
mv control02.ctl control02.ctl.bak
9、修改pfile,刪除testdbutf8相關的參數，替換所有參數值中testdbutf8爲testdb2，修改結果如下
cd $ORACLE_HOME/dbs
vi inittestdb2.ora
testdb2.__db_cache_size=9026142208
testdb2.__java_pool_size=33554432
testdb2.__large_pool_size=67108864
testdb2.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
testdb2.__pga_aggregate_target=2147483648
testdb2.__sga_target=10737418240
testdb2.__shared_io_pool_size=0
testdb2.__shared_pool_size=1543503872
testdb2.__streams_pool_size=0
*.audit_file_dest='/u01/app/oracle/admin/testdb2/adump'
*.audit_trail='NONE'
*.compatible='11.2.0.4.0'
*.control_files='/oradata/datafile/testdb2/control01.ctl','/u01/app/oracle/fast_recovery_area/testdb2/control02.ctl'
*.db_block_size=8192
*.db_domain=''
*.db_files=500
*.db_name='testdb2'
*.db_recovery_file_dest='/u01/app/oracle/fast_recovery_area'
*.db_recovery_file_dest_size=5218762752
*.db_unique_name='testdb2'
*.deferred_segment_creation=FALSE
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers=''
*.fast_start_mttr_target=300
*.job_queue_processes=10
*.log_archive_format='%t_%s_%r.arc'
*.open_cursors=1000
*.optimizer_index_caching=5
*.optimizer_index_cost_adj=90
*.parallel_max_servers=256
*.parallel_servers_target=64
*.pga_aggregate_target=2147483648
*.processes=3000
*.remote_login_passwordfile='EXCLUSIVE'
*.resource_limit=TRUE
*.session_cached_cursors=500
*.sessions=3305
*.sga_target=10737418240
*.undo_retention=3600
*.undo_tablespace='UNDOTBS1'
10、登錄數據庫，生成spfile
sqlplus / as sysdba
create spfile from pfile='?/dbs/inittestdb2.ora';
11、運行之前的testdb2.sql
@/u01/app/oracle/diag/rdbms/testdb2/testdb2/trace/testdb2.sql
SQL> @/u01/app/oracle/diag/rdbms/testdb2/testdb2/trace/testdb2.sql
ORACLE instance started.
Total System Global Area 1.0689E+10 bytes
Fixed Size 2262656 bytes
Variable Size 1644169600 bytes
Database Buffers 9026142208 bytes
Redo Buffers 16900096 bytes
Control file created.
Database altered.
Tablespace altered.
12、驗證數據庫名稱是否已改
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ WRITE
SQL> show parameter name
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cell_offloadgroup_name string
db_file_name_convert string
db_name string testdb2
db_unique_name string testdb2
global_names boolean FALSE
instance_name string testdb2
lock_name_space string
log_file_name_convert string
processor_group_name string
service_names string testdb2
SQL> select name from v$database;
NAME
---------
TESTDB2
SQL> exit
#######完成修改#######