ORA-12514:TNS:listener does not currently know of service requested in connect descriptor

1、错误描述

2、错误原因

      确保OracleServiceORCL、OracleDBConsoleorcl和OracleOraDb11g_home1TNSListener三个已经启动，但是OracleDBConsoleorcl未启动

3、解决办法

     开启OracleDBConsoleorcl

原文：http://blog.csdn.net/you23hai45/article/details/50160551