LOAD_BALANCE FAILOVER SOURCE_ROUTE 组合分类

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1、按顺序尝试每个地址，直到有一个成功
tnsnames.ora 里面的配置是这样的
SUN =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 岑仁彪)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.5.100)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = sun)
    )
  )
默认情况下,LOAD_BALANCE=no,FAILOVER=true,SOURCE_ROUTE=no

2、随机尝试每个地址，直到成功
tnsnames.ora 里面的配置是这样的
SUN =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 岑仁彪)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.5.100)(PORT = 1521))
      (LOAD_BALANCE = yes)
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = sun)
    )
  )

3、随机选择尝试一个地址
tnsnames.ora 里面的配置是这样的
SUN =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 岑仁彪)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.5.100)(PORT = 1521))
      (LOAD_BALANCE = yes)
      (FAILOVER = false)
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = sun)
    )
  )

4、按顺序使用每个地址，直到到达目标
tnsnames.ora 里面的配置是这样的
SUN =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 岑仁彪)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.5.100)(PORT = 1521))
      (SOURCE_ROUTE = yes)
      (FAILOVER = false)
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = sun)
    )
  )

5、只使用第一个地址
SUN =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 岑仁彪)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.5.100)(PORT = 1521))
      (FAILOVER = false)
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = sun)
    )
  )

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