搭建dg启动物理备库到nomount状态后,测试连通性时发现备库能正常连接主库,但主库却没法连接备库,报错ora-12528

问题描述:搭建dg启动物理备库到nomount状态后,测试连通性时发现备库能正常连接主库,但主库却没法连接备库,报错ora-12528,如下所示.
主库:主机名 risdb + oracle 11.2.0.4
备库:主机名 risnewdg + oracle 11.2.0.4
1、问题重现

搭建dg启动物理备库到nomount状态后,测试连通性时发现备库能正常连接主库,但主库却没法连接备库,报错ora-12528

2、问题排查
--查备库监听文件
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = simnewdg)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)

ADR_BASE_LISTENER = /u01/app/oracle

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = simnewdg)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(SID_NAME = simnewdg)
)
)
--查备库tnsnames.ora文件
[oracle@simnewdg admin]$ cat tnsnames.ora
risdb =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = risdb)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = simdb1)
)
)

SIMNEWDG =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = simnewdg)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = simdb1)
)
)
--查备库数据库信息
SQL> show parameter name

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cell_offloadgroup_name string
db_file_name_convert string /u01/app/oracle/oradata/spectr
a/datafile/, /data/risdb/, /u0
1/app/oracle/oradata/spectra/t
empfile/, /data/risdb/
db_name string spectra
db_unique_name string simnewdg
global_names boolean FALSE
instance_name string simnewdg
lock_name_space string
log_file_name_convert string /u01/app/oracle/oradata/spectr
a/logfile/, /data/risdb/
processor_group_name string
service_names string simdb1

解决方案:
a、修改监听文件中global_dbname=simdb1
或者
b、修改tnsname.ora 中的 simdb1 的服务名 service_name=simnewdg