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

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

XML code

SID_LIST_LISTENER =  (SID_LIST =    (SID_DESC =      (SID_NAME = PLSExtProc)      (ORACLE_HOME = /u01/oracle)      (PROGRAM = extproc)    )   (SID_DESC =    (GLOBAL_DBNAME =lsnode2)    (ORACLE_HOME = /u01/oracle)    (SID_NAME = dgdemo)   )  )LISTENER =  (DESCRIPTION_LIST =    (DESCRIPTION =      (ADDRESS = (PROTOCOL = TCP)(HOST = node2)(PORT = 1521))      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))    )  )

tnsnames.ora

XML code

LSNODE2 =  (DESCRIPTION =    (ADDRESS_LIST =      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.189)(PORT = 1521))    )    (CONNECT_DATA =      (SERVICE_NAME = dgdemo)    )  )LSNODE1 =  (DESCRIPTION =    (ADDRESS_LIST =      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.188)(PORT = 1521))    )    (CONNECT_DATA =      (SERVICE_NAME = dgdemo)    )  )EXTPROC_CONNECTION_DATA =  (DESCRIPTION =    (ADDRESS_LIST =      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))    )    (CONNECT_DATA =      (SID = PLSExtProc)      (PRESENTATION = RO)    )  )

SQL code

[oracle@node2 admin]$ sqlplus system/oracle@lsnode1SQL*Plus: Release 10.2.0.1.0 - Production on Wed Mar 3 11:30:32 2010Copyright (c) 1982, 2005, Oracle.  All rights reserved.ERROR:ORA-12514: TNS:listener does not currently know of service requested in connectdescriptorEnter user-name: 

[解决办法]
DG环境？


sqlplus system/oracle@lsnode1


LSNODE1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.188)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = dgdemo)
)
)


贴出node1上的listen.ora
[解决办法]
你的服务没有启动吧,数据库实例启动了?