ORA-12514: TNS:监听程序当前无法识别连接描述符中请

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若Oracle出现“监听程序当前无法识别连接描述符中请求的服务”这个错误可以按照以下方法解决：

可以通过这个路径找到一个文本文件： oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora 还一个在同路径下的tnsnames.ora文件，这两个文本中的一些信息要是这样的： listener.ora # 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 = PLSExtProc)       (ORACLE_HOME = F:\oracle\product\10.2.0\db_1)       (PROGRAM = extproc)     )      (SID_DESC =       (GLOBAL_DBNAME = orcl)       (ORACLE_HOME = F:\oracle\product\10.2.0\db_1)       (SID_NAME = orcl)     )
)
LISTENER = (DESCRIPTION_LIST =     (DESCRIPTION =       (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))     ) )
出现“监听程序当前无法识别连接描述符中请求的服务”一般是因为缺少了上面中间位置的

(SID_DESC =       (GLOBAL_DBNAME = orcl)       (ORACLE_HOME = F:\oracle\product\10.2.0\db_1)       (SID_NAME = orcl)     ) 只要把它加在上面就ＯＫ了！！！！！！！！！！！！！
tnsnames.ora # 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 = 127.0.0.1)(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)     ) )

ORA-12514: TNS:监听程序当前无法识别连接描述符中请

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原文地址：http://www.cnblogs.com/outlooking/p/4263385.html