ORA-12514: TNS:listener does not currently know of service requested in connect

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配置data guard网络监听的时候，连接测试报错如下：

ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor

出错原因是由于，在修改init$ORACLE_SID.ora文件时，在主库里面新添加了一项db_unique_name=10gpri；

备库上新添加一项db_unique_name=10gstandby.

在配置监听文件和客户端tnsnames.ora时，就要修改GLOBAL_DBNAME 成相应的10gpri或10standby.

[oracle@dg01 admin]$ cat listener.ora
LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = 172.21.1.30)(PORT = 1521))
      )
    )
)
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /u01/oracle/product/10.2.0/db_1 )
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = 10gpri)
      (ORACLE_HOME = /u01/oracle/product/10.2.0/db_1)
      (SID_NAME = dg01)
    )
)

[oracle@dg01 admin]$ cat tnsnames.ora

10gpri=
(DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.21.1.30)(PORT = 1521))
    (CONNECT_DATA =
        (server=dedicated)
        (service_name = 10gpri)
    )
)

10gstandby=
(DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.21.1.31)(PORT = 1521))
    (CONNECT_DATA =
        (server=dedicated)
        (service_name = 10gstandby)
    )
)

在两个节点上测试如下：

节点dg01：

[oracle@dg01 dbs]$ sqlplus scott/tiger@10gstandby

SQL*Plus: Release 10.2.0.1.0 - Production on Wed Aug 24 03:29:28 2011

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SCOTT_S:138_P:28085_10gstandby> show parameter name

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string
db_name                              string      dg01
db_unique_name                       string      10gstandby
global_names                         boolean     FALSE
instance_name                        string      dg01
lock_name_space                      string
log_file_name_convert                string
service_names                        string      10gstandby

节点dg02:

[oracle@dg02 dbs]$ sqlplus scott/tiger@10gpri

SQL*Plus: Release 10.2.0.1.0 - Production on Wed Aug 24 03:29:28 2011

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SCOTT_S:145_P:22710_10gpri> show parameter name

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string
db_name                              string      dg01
db_unique_name                       string      10gpri
global_names                         boolean     FALSE
instance_name                        string      dg01
lock_name_space                      string
log_file_name_convert                string
service_names                        string      10gpri