一个数据库如何在不同端口上监听

如题，周五在客户现场，看到客户在baidu搜索相关的信息，就讨论下他的需求：

由于收市后（证券公司），默认的1521端口会被切断，但是出于维护需要连接上这个数据库。

客户的想法是同一个监听2个端口,我的想法是2个监听。在此记录下2中不同的方式。

原listener.ora配置文件：

# listener.ora Network Configuration File: /opt/oracle/db/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gtlions)(PORT = 1521))
    )
  )

ADR_BASE_LISTENER = /opt/oracle/db

1、一个监听对应2个端口 1521 1522

listener.ora配置如下：

# listener.ora Network Configuration File: /opt/oracle/db/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = TEST)
      (ORACLE_HOME = /opt/oracle/db/db_1)
      (SID_NAME = TEST)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gtlions)(PORT = 1521))
    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gtlions)(PORT = 1522))
    )
  )

ADR_BASE_LISTENER = /opt/oracle/db

tnsnames.ora配置如下：

# tnsnames.ora Network Configuration File: /opt/oracle/db/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

TEST =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = TEST)
    )
  )

TEST2 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1522))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = TEST)
    )
  )
测试

通过TEST和TEST2均能够连接和使用，但是stop掉监听listener之后2个端口无法都无法使用。

2、2个监听对应2个端口1521 1522

listener.ora配置如下：

# listener.ora Network Configuration File: /opt/oracle/db/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = TEST)
      (ORACLE_HOME = /opt/oracle/db/db_1)
      (SID_NAME = TEST)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gtlions)(PORT = 1521))
    )
  )

SID_LIST_TEST =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = TEST)
      (ORACLE_HOME = /opt/oracle/db/db_1)
      (SID_NAME = TEST)
    )
  )

TEST =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gtlions)(PORT = 1522))
    )
  )

ADR_BASE_LISTENER = /opt/oracle/db

tnsnames.ora配置不变。
测试

通过TEST和TEST2均能够连接和使用，而且因为2个端口分别由2个listener管理，单独停掉或被封住一个端口并不影响另一个端口使用。

小结

第1种方式一个监听对应2个端口，带来的问题是无法单独关掉这个端口的监听。

-The End-