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前言

主库环境是19C RAC备库环境也是19C RAC，主库到备库做adg，dg配置和11g没有太大区别，RAC主库到单实例备库配置没有任何区别，19c和11g rac到rac备库配置唯一的区别在于19C修改db_unique_name的时候不能在实例层面直接修改，19C的db_unique_name是作为集群资源管理的，所有修改需要在集群层面进行操作。

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一、问题描述

备库在dg配置过程中修改db_unique_name报错：ORA-32017 ORA-65500，提示不能在实例层面编辑db_unique_name

[oracle@rac18c-n2 ~]$ oerr ora 65500
65500, 00000, "could not modify DB_UNIQUE_NAME, resource exists"
// *Cause:  DB_UNIQUE_NAME could not be modified, because a database resource
//          identified by DB_UNIQUE_NAME existed in the cluster.  To modify
//          DB_UNIQUE_NAME, any resource it identifies must first be removed.
// *Action: Remove the database resource identified by DB_UNIQUE_NAME before 

二、修改DB_UNIQUE_NAME

1.查看集群配置

[oracle@nptdb1dg ~]$ srvctl config database -d hip40
Database unique name: hip40
Database name: hip40
Oracle home: /u01/app/oracle/product/19.3.0.0/db_1
Oracle user: oracle
Spfile: +DATA/HIP40/PARAMETERFILE/spfile.280.1135195669
Password file: +DATA/HIP40/PASSWORD/pwdhip40    --19C的密码文件也存放在了存储中，并且命名也变了。
--spfile和密码文件的路径要记录一下，等会重新添加db的时候要用到
Domain: 
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: 
Disk Groups: DATA
Mount point paths: 
Services: 
Type: RAC
Start concurrency: 
Stop concurrency: 
OSDBA group: dba
OSOPER group: oper
Database instances: hip401,hip402
Configured nodes: nptdb1dg,nptdb2dg
CSS critical: no
CPU count: 0
Memory target: 0
Maximum memory: 0
Default network number for database services: 
Database is administrator managed

2.将hip40实例从集群中移除

[oracle@nptdb1dg ~]$ srvctl remove database -d hip40
PRKO-3141 : Database hip40 could not be removed because it was running
--报错提示实例正在运行，可以先停止实例，再移除，我这里加-f强制移除。
[oracle@nptdb1dg ~]$ srvctl remove database -d hip40 -f

3.修改db_unique_name

[oracle@nptdb1dg ~]$ sqlplus /nolog

SQL*Plus: Release 19.0.0.0.0 - Production on Thu May 4 10:11:20 2023
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

SQL> conn / as sysdba
Connected.
SQL> alter system set db_unique_name='hip40dg' scope=spfile sid='*';

System altered.

SQL> exit
Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
[oracle@nptdb1dg ~]$ srvctl config database -d hip40dg   --修改后还不能在集群资源中查看修改后的实例信息，需要将新的实例信息添加到集群资源中去。
PRCD-1120 : The resource for database hip40dg could not be found.
PRCR-1001 : Resource ora.hip40dg.db does not exist

4.将hip40dg实例添加到集群资源中

[oracle@nptdb1dg ~]$ srvctl add database -db hip40dg -dbname hip40
PRKO-2082 : Missing mandatory option -oraclehome
--提示要加上oraclehome
[oracle@nptdb1dg ~]$ srvctl add database -db hip40dg -dbname hip40 -oraclehome
PRKO-2388 : Command line option -oraclehome should be followed by a value.
[oracle@nptdb1dg ~]$ srvctl add database -db hip40dg -dbname hip40 -oraclehome /u01/app/oracle/product/19.3.0.0/db_1
[oracle@nptdb1dg ~]$ srvctl config database -d hip40dg
Database unique name: hip40dg
Database name: hip40
Oracle home: /u01/app/oracle/product/19.3.0.0/db_1
Oracle user: oracle
Spfile: 
Password file: 
Domain: 
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: 
Disk Groups: 
Mount point paths: 
Services: 
Type: RAC
Start concurrency: 
Stop concurrency: 
OSDBA group: dba
OSOPER group: oper
Database instances: 
Configured nodes: 
CSS critical: no
CPU count: 0
Memory target: 0
Maximum memory: 0
Default network number for database services: 
Database is administrator managed

[oracle@nptdb1dg ~]$ srvctl add instance -db hip40dg -instance hip401 -node nptdb1dg
[oracle@nptdb1dg ~]$ srvctl add instance -db hip40dg -instance hip402 -node nptdb2dg
--将db分别添加到两个节点
[oracle@nptdb1dg ~]$ srvctl config database -d hip40dg
Database unique name: hip40dg
Database name: hip40
Oracle home: /u01/app/oracle/product/19.3.0.0/db_1
Oracle user: oracle
Spfile: 
Password file: 
Domain: 
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: 
Disk Groups: 
Mount point paths: 
Services: 
Type: RAC
Start concurrency: 
Stop concurrency: 
OSDBA group: dba
OSOPER group: oper
Database instances: hip401,hip402
Configured nodes: nptdb1dg,nptdb2dg
CSS critical: no
CPU count: 0
Memory target: 0
Maximum memory: 0
Default network number for database services: 
Database is administrator managed


[oracle@nptdb1dg ~]$ srvctl modify database -db hip40dg -spfile '+DATA/HIP40/PARAMETERFILE/spfile.280.1135195669' -pwfile '+DATA/HIP40/PASSWORD/pwdhip40'
[oracle@nptdb1dg ~]$ srvctl config database -d hip40dg
Database unique name: hip40dg
Database name: hip40
Oracle home: /u01/app/oracle/product/19.3.0.0/db_1
Oracle user: oracle
Spfile: +DATA/HIP40/PARAMETERFILE/spfile.280.1135195669
Password file: +DATA/HIP40/PASSWORD/pwdhip40
Domain: 
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: 
Disk Groups: 
Mount point paths: 
Services: 
Type: RAC
Start concurrency: 
Stop concurrency: 
OSDBA group: dba
OSOPER group: oper
Database instances: hip401,hip402
Configured nodes: nptdb1dg,nptdb2dg
CSS critical: no
CPU count: 0
Memory target: 0
Maximum memory: 0
Default network number for database services: 
Database is administrator managed

5.重新启动实例

[oracle@nptdb1dg ~]$ srvctl stop database -d hip40dg
[oracle@nptdb1dg ~]$ srvctl start database -d hip40dg

三、19C RAC 密码文件替换

19C的密码文件保存在了ASM中，替换方式与11G不同。这里简单记录一下。

1.我们可以在主库将密码文件从asm中拷贝到系统本地，再将主库的密码文件拷贝到备库asm

ASMCMD> pwcopy pwdhip40.256.1135194859 /tmp
copying +data/hip40/password/pwdhip40.256.1135194859 -> /tmp/pwdhip40.256.1135194859

2.我们也可以在备库本地直接生成密码文件（注意密码文件名格式），然后将生成的密码文件拷贝到asm

[oracle@nptdb1dg ~]$orapwd file=pwdhip40 asm=data password=manager  
--这个没试过，可以试试

ASMCMD> pwcopy /u01/app/oracle/product/19.3.0.0/db_1/dbs/pwdhip40 .
copying /u01/app/oracle/product/19.3.0.0/db_1/dbs/pwdhip40 -> +DATA/hip40/password/pwdhip40

3.在集群中修改密码文件配置

[oracle@nptdb1dg ~]$srvctl modify database -d hip40 -pwfile +DATA/HIP40/PASSWORD/pwdhip40
--修改完可以通过命令srvctl config database -d hip40查看配置