本文主要是介绍Windows7旗舰版安装PLSQLDeveloper连接数据库遇到：ora-12514 问题和ORA-12545:因目标主机或对象不存在，连接失败”解决方法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1、 解决ora-12514 问题
找到F:\oracle\product\10.2.0\db_1\NETWORK\ADMIN目录下的tnsnames.ora文件
将如下内容替换tnsnames.ora文件内容：
# tnsnames.ora Network Configuration File:F:\oracle\product\10.2.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Win7-PC)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
替换完后重启oracle服务
ORA-12545:因目标主机或对象不存在，连接失败”问题的解决
在F:\oracle\product\10.2.0\db_1\NETWORK\ADMIN目录下找到listenner.ora文件
将内容做如下替换：
# listener.ora Network Configuration File:F:\oracle\product\10.2.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = ORCL)
(ORACLE_HOME = F:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = Win7-PC)(PORT = 1521))
)
)
替换完后重启oracle服务和监听服务
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