有关Oracle数据库的问题，登入不进去

[ouyangbin523]

登入oracle数据库时，连接身份选择Normal时，登入时提示：“当前授予您的数据库权限不足以运行此应用程序”，而通过plsql还是能正常登入，然后我连接身份选择SYSDBA登入时，则提示：“ORA-01031：insufficient privileges”，这是什么原因？

我的listener.ora文件如下
# listener.ora Network Configuration File: F:\OracleInstantClient_10_2\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = F:\oracle\product\10.2.0\client_1)
(PROGRAM = extproc)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 202.195.71.242)(PORT = 1521))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
)

sqlnet.ora文件如下：
# sqlnet.ora Network Configuration File: F:\OracleInstantClient_10_2\NETWORK\ADMIN\sqlnet.ora
# Generated by Oracle configuration tools.

SQLNET.AUTHENTICATION_SERVICES= (NTS)

NAMES.DIRECTORY_PATH= (TNSNAMES)

tnsnames.ora文件如下：
# tnsnames.ora Network Configuration File: F:\OracleInstantClient_10_2\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.

ORCL_202.195.71.242 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 202.195.71.242)(PORT = 1521))
)
(CONNECT_DATA =
(SID = orcl)
(SERVER = DEDICATED)
)
)

ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 202.195.71.242)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

请各位高手指点迷津，不甚感谢！

[linwaterbin]

从OEM上登入的吗？

[ouyangbin523]

恩，从Enterprise Manager console 中登入的

[sych888]

发给10gR2的TNS配置文件部分片段，您参考一下 ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ****)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) )

[ouyangbin523]

我tnsnames.ora文件贴出来了，你帮我看看有什么问题吧！

[Wentasy]

使用的什么用户？

[沉---枫]

你尝试下给你登入的用户赋予DBA权限看看