TNS:listener does not currently know of service requested in connect descriptor错误改正

(SID_LIST =
 (SID_DESC =
  (SID_NAME = PLSExtProc)
  (ORACLE_HOME = E:oracleproduct10.2.0db_1)
  (PROGRAM = extproc)
  )

)原先在listener.ora中是这样的

改成下面

(SID_LIST =
 (SID_DESC =
  (SID_NAME = PLSExtProc)
  (ORACLE_HOME = E:oracleproduct10.2.0db_1)
  (PROGRAM = extproc)
  ) (SID_DESC =
     (GLOBAL_DBNAME = ORCL)
     (ORACLE_HOME = E:oracleproduct10.2.0db_1)
     (SID_NAME = ORCL)
  )
)

其中注意更改oracle_home路径为本机路径

然后去重启oracle服务和监听器即可