ORA-12560: TNS:protocol adapter error

sys@orcl as SYSDBA

ORA-12560: TNS:protocol adapter error

此问题是由于oracle_sid没有设置或者设置错误导致的.

解决办法:

1:cmd命令行上:

C:\> set ORACLE_SID=orcl

orcl是设置的instance名字

在命令行上连接sqlplus如下:

C:\Documents and Settings\ldwtxwh>sqlplus

SQL*Plus: Release 10.1.0.2.0 - Production on 星期日 12月 20 18:22:28 2009

Copyright (c) 1982, 2004, Oracle. All rights reserved.

Enter user-name: system

Enter password:

Connected to:

Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production

With the Partitioning, OLAP and Data Mining options

SQL>

ok!连接完毕

2:C:\Documents and Settings\ldwtxwh>sqlplus

SQL*Plus: Release 10.1.0.2.0 - Production on 星期日 12月 20 18:33:31 2009

Copyright (c) 1982, 2004, Oracle. All rights reserved.

Enter user-name: sys@orcl SYSDBA

Enter password:

Connected to:

Oracle Database10gEnterpriseEdition Release10.2.0.1.0 - Production

With the Partitioning, OLAP and Data Mining options

SQL>

ok!连接完毕

现在用你的sqlplus就可以连接登陆了.