DG搭建常见问题处理

在搭建DG的过程中，会遇见好多问题，现在整理出部分产常见的错误及解决方法。

1、ORA-09925报错

报错1:

connected to auxiliary database (not started)
released channel: prmy1
released channel: prmy2
released channel: prmy3
released channel: prmy4
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 07/27/2018 10:48:43
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-04014: startup failed: ORA-09925: Unable to create audit trail file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 9925

原因:备库adump文件不存在
解决:

mkdri -p $ORACLE_HOME/admin/db_unique_name/adump

例如：

mkdir -p $ORACLE_BASE/admin/mssdbdg/adump

2、RMAN-05537报错

报错2:

Starting Duplicate Db at 27-JUL-18
released channel: prmy1
released channel: prmy2
released channel: prmy3
released channel: prmy4
released channel: stby
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 07/27/2018 10:57:28
RMAN-05501: aborting duplication of target database
RMAN-05537: DUPLICATE without TARGET connection when auxiliary instance is started with spfile cannot use SPFILE clause

原因:备库跑了duplicate脚本,没有删除spfile文件，重新启动数据库到nomount
解决:先删除spfile文件，重新启动数据库到nomount

3、ORA-17628: Oracle error 19505 报错

contents of Memory Script:
{
   backup as copy current controlfile for standby auxiliary format  '/ORADATA/RESNETDBDG/control01.ctl';
   restore clone primary controlfile to  '/ORADATA/fast_recovery_area/RESNETDBDG/control02.ctl' from
 '/ORADATA/RESNETDBDG/control01.ctl';
}
executing Memory Script
Starting backup at 26-JUL-2018 18:42:20
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
copying standby control file
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 07/26/2018 18:42:21
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 07/26/2018 18:42:21
ORA-17628: Oracle error 19505 returned by remote Oracle server

原因：目标端路径不存在，可能是文件系统路径不存在，也可能是权限不够，如果是ASM，请确认磁盘组是否存在，磁盘的权限是否正确
解决：mkdir -p /ORADATA/fast_recovery_area/RESNETDBDG/

4、ORA-01017报错
这里是报密码错误，SYS用户登录采用的是密码文件认证的方法，所以需要确保密码文件可读写和密码文件的名字中的ORACLE_SID与监听中的ORACLE_SID是对应的。密码错误分很多情况。

4.1 第一次搭建时报密码错误

4.1.1 密码文件不一致
通过在主库的一个节点修改密码后，将此节点的密码文件复制给其它所有的节点，包括主库的节点和备库的所有的节点，确认Oracle用户有对写的权限。

4.1.2 目标端报密码错误
已经完成4.1.1的操作，但是仍然报密码错误。这个时候很可能是静态监听里面的数据库ORACLE_SID与密码文件中的SID不一致。

5、日志不传输到备库分析方法

SELECT DESTINATION, STATUS, ERROR FROM V$ARCHIVE_DEST WHERE TARGET='STANDBY';

查看ERROR的报错代码，根据报错代码来解决问题。

6、ORA-00845报错

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 07/30/2018 02:22:10
RMAN-03015: error occurred in stored script Memory Script
RMAN-04014: startup failed: ORA-00845: MEMORY_TARGET not supported on this system

​由于使用AMM功能，但是SHM大小没有AMM那么大，所有需要重新SHM，并指定跟AMM相同的大小

mount -o remount,default,size=102G /dev/shm

修改/etc/fstab中的值

7、监听配置没问题，sqlplus测试没问题，tnsping也没问题，可还是报下边错误

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 08/05/2018 02:30:01
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of backup command on prmy2 channel at 08/05/2018 02:30:01
ORA-17629: Cannot connect to the remote database server
ORA-17627: ORA-12154: TNS:could not resolve the connect identifier specified
ORA-17629: Cannot connect to the remote database server
RMAN> 

解决：把tnsnames.ora的内容，在grid的network/admin下复制一份
可以在MOS上查看RMAN Active Duplicate on RAC fails with ORA-17629 and ORA-17627: ORA-12154 (文档 ID 1982003.1)

8、duplicate出错，查看原因是原库有两个数据文件没有使用OMF格式，无法传过去。

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 08/05/2018 20:42:25
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of backup command on prmy4 channel at 08/05/2018 20:01:35
ORA-17628: Oracle error 19505 returned by remote Oracle server
RMAN-03009: failure of backup command on prmy4 channel at 08/05/2018 20:01:20
ORA-17628: Oracle error 19505 returned by remote Oracle server

​解决：查看错误代码：MOS 1331986.1
注意，做之前先确定一下是不是OMF文件，若不是，先在asm的子层建好目录或在脚本里把子层目录写好。