關於oracle IP地址修改和主機名修改，其實對不同環境有不同的更改方法
1）單機single的資料庫修改 ;
2) ASM+single的修改；
3）RAC 叢集的修改。

單機single的資料庫修改

原主機名和IP
txld102057 192.168.102.57
更改為：
db1 192.168.102.59
步驟

1.重置密碼，後續註冊需要用到，如果記得知道密碼可以不用重置；

SYSMAN，SYS,DBSNMP

alter user SYSMAN account unlock IDENTIFIED BY syspassword;
alter user
 
 SYS account unlock IDENTIFIED BY syspassword;
alter user DBSNMP account unlock IDENTIFIED BY syspassword;

2.關閉資料庫

shutdown immediate;

3.關閉監聽（oracle使用者下）

lsnrctl stop

4.root 使用者下修改 /etc/hosts ，登出原來主機內容，加入如內容

192.168.102.59 db1

5.修改IP地址，並重啟

setup( centos 7以下版本）
nmtui（centos 7以上版本）
reboot

6.修改監聽，將txld10257改為 db1 （oracle使用者）

vim /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora

將HOST 如 HOST = db1

vim /u01/app/oracle/product/11.2.0/db_1/network/admin/tnsnames.ora 

7.啟動資料、啟動監聽

startup
lsnrctl start.

8.刪除原來的監聽 （Oracle執行狀態）

emca -deconfig dbcontrol db -repos drop

[[email protected]
 
 ~]$ emca -deconfig dbcontrol db -repos drop

STARTED EMCA at Sep 5, 2018 9:24:04 AM
EM Configuration Assistant, Version 11.2.0.3.0 Production
Copyright (c) 2003, 2011, Oracle.  All rights reserved.

Enter the following information:
Database SID: orcl
Listener port number: 1521
Password for SYS user:  
Password for SYSMAN user:  

----------------------------------------------------------------------
WARNING : While repository is dropped the database will be put in quiesce mode.
----------------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: Y  
Sep 5, 2018 9:25:13 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_2018_09_05_09_24_03.log.
Sep 5, 2018 9:25:14 AM oracle.sysman.emcp.EMDBPreConfig performDeconfiguration
WARNING: EM is not configured for this database. No EM-specific actions can be performed. Some of the possible reasons may be: 
 1) EM is configured with different hostname then physical host. Set environment variable ORACLE_HOSTNAME=<hostname> and re-run EMCA script 
 2) ORACLE_HOSTNAME is set. Unset it and re-run EMCA script
Sep 5, 2018 9:25:14 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) ...
Sep 5, 2018 9:27:41 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Enterprise Manager configuration completed successfully
FINISHED EMCA at Sep 5, 2018 9:27:41 AM

9.重建監聽

 emca -config dbcontrol db -repos create

[[email protected] ~]$ emca -config dbcontrol db -repos create

STARTED EMCA at Sep 5, 2018 9:29:08 AM
EM Configuration Assistant, Version 11.2.0.3.0 Production
Copyright (c) 2003, 2011, Oracle.  All rights reserved.

Enter the following information:
Database SID: orcl
Listener port number: 1521
Listener ORACLE_HOME [ /u01/app/oracle/product/11.2.0/db_1 ]: 
Password for SYS user:  
Password for DBSNMP user:  
Password for SYSMAN user:  
Password for SYSMAN user: Email address for notifications (optional): 
Outgoing Mail (SMTP) server for notifications (optional): 
-----------------------------------------------------------------

You have specified the following settings

Database ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/db_1

Local hostname ................ db1
Listener ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/db_1
Listener port number ................ 1521
Database SID ................ orcl
Email address for notifications ............... 
Outgoing Mail (SMTP) server for notifications ............... 

-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: Y
Sep 5, 2018 9:30:04 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_2018_09_05_09_29_08.log.
Sep 5, 2018 9:30:06 AM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Sep 5, 2018 9:36:13 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
Sep 5, 2018 9:36:20 AM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while) ...
Sep 5, 2018 9:38:10 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Uploaded configuration data successfully
Sep 5, 2018 9:38:15 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while) ...
Sep 5, 2018 9:38:29 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Database Control secured successfully.
Sep 5, 2018 9:38:29 AM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Sep 5, 2018 9:39:47 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Sep 5, 2018 9:39:48 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is https://db1:1158/em <<<<<<<<<<<
Sep 5, 2018 9:40:12 AM oracle.sysman.emcp.EMDBPostConfig invoke
WARNING: 
************************  WARNING  ************************

Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted.  The encryption key has been placed in the file: /u01/app/oracle/product/11.2.0/db_1/db1_orcl/sysman/config/emkey.ora. Ensure this file is backed up as the encrypted data will become unusable if this file is lost. 

***********************************************************
Enterprise Manager configuration completed successfully
FINISHED EMCA at Sep 5, 2018 9:40:12 AM

(如果重建監聽出現物件已存在或者sysman已存在錯誤，可以按以下操作
1.刪除早期DBCONSOLE建立的使用者：
sql>drop role MGMT_USER;
sql>drop user MGMT_VIEW cascade;
sql>drop user sysman cascade;
2.刪除早期DBCONSOLE建立的物件：
sql>drop PUBLIC SYNONYM MGMT_TARGET_BLACKOUTS;
sql>drop PUBLIC SYNONYM SETEMVIEWUSERCONTEXT;
然後再重新執行重建操作。）

10.檢查

檢查這些檔案主機名是否更新
ll /u01/app/oracle/product/11.2.0/db_1/oc4j/j2ee/
核對有沒OC4J_DBConsole_db1_orcl
是否存在這樣的目錄
ll /u01/app/oracle/product/11.2.0/db_1/db1_orcl/