Oracle Err "listener does not currently know of SID given in connect descriptor"

关于启动数据库后提示ora-12505的解决方法：
"listener does not currently know of SID given in connect descriptor"

第一种可能
是配置得数据库SID名不正确localhost:1521:oracle即红字部份不是你本机的SID。

第二种可能
发现SID配置没有错误，但是还是报错，那可能就是oracle得监听配置出了问题，需要检查listener.ora文件，用记事本打开，增加以下部份代码:
(SID_DESC =
      (GLOBAL_DBNAME = oracle)
      (ORACLE_HOME = \app\oracle\product\10.2.0\db_1)
      (SID_NAME = oracle)
)
红字部份的SID改成oracle创建时候的SID保存退出。

正确配置如下：

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = e:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = oracle)
      (ORACLE_HOME = e:\oracle\product\10.2.0\db_1)
      (SID_NAME = oracle)
    )
  )
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )