使用sqlplus登录看看
sqlplus / as sysdba
如果可以正常登录的话，一般信息如下：
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Nov 30 15:48:35 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
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