Oralce TNS:监听程序当前无法识别连接

安装Oralce之后，想连接一下，结果通过客户端PL/SQL，怎么也连不上，提示TNS:监听程序当前无法识别连接解决办法：1.查看本机的/$

安装Oralce之后，想连接一下，，结果通过客户端PL/SQL，怎么也连不上，提示TNS:监听程序当前无法识别连接
解决办法：

1.查看本机的/$/Oracle/oracle/network/admin/
vi tnsnames.ora 没改之前后面的端口是1523 ，我把它改成1521了

SALES =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = sales)
)
)

LISTENER_SALES =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))


EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC3))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

2.再查看listener.ora
默认没有修改的是这样：其中没有上文tnsnames.ora中sales
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /mapbar/oracle/oracle)
(PROGRAM = extproc)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC3))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1523))
)

需要增加：红色部分是新增加的
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /$/oracle/oracle)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = sales)
(ORACLE_HOME = /$/oracle/oracle)
(SID_NAME = sales)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC3))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
)
)

3.执行 lsnrctl stop
lsnrctl start