v$session 视图中的 FAILOVER_TYPE 字段

如果我们的连接串中含有 FAILOVER_MODE 字段（图一），那么连上来的session 中FAILOVER_TYPE 的值为session （图二）

否则为NONE

NEWKFDB1 =
(DESCRIPTION =
(LOAD_BALANCE = OFF)
(FAILOVER = ON)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = XXXXX)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 135.10.55.53)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = JYKFSERV)
(FAILOVER_MODE=(TYPE=SESSION)(METHOD=BASIC)(RETRIES = 4)(DELAY = 1))
)
)

图一

SQL> select FAILOVER_TYPE from v$session where USERNAME='HUANG';

FAILOVER_TYPE
---------------------------------------
SESSION

图二

否则这个字段为空 ：none