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listener does not currently know of SID异常

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Oracle中"listener does not currently know of SID given in connect descriptor"异常
大概意思:连接Oracle数据库时,监听无法识别SID

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
配置的数据库SID名不正确localhost:1521:oracle 即红字部分不是你本机的SID,那么如何查看本机得SID呢?用如下命令 select name from v$database;在sqlplus中执行就可以看到,把红字部分换成查询出来的SID就可以。
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监听配置出了问题,需要检查listener.ora文件,用记事本打开,
正确配置如下:
# listener.ora Network Configuration File: D:\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 = D:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )
  )
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = ljq-PC)(PORT = 1521))
    )
  )
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