datasource.url=jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.216)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.217)(PORT = 1521))(LOAD_BALANCE = yes)(FAILOVER = yes)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = cbl)(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RETIRES = 180)(DELAY = 15))))
至此oracle 11g adg服务高可用配置完毕
总结：这时候可以测试下，当你主库shutdown abort的时候，你的从库自动转换成主库，然后触发器启动dbha服务，然后pmon自动注册监听，然后由于你配置了TAF特性，所以你的服务并不会报错(ORA-0133:ORACLE initialization or shutdown in progress错误)，而是自动的连接到新的主库!
验证过程：
1.客户端配置tnsnames.ora
dbha=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.9.21.178)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.9.21.179)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = dbha)
)
)
2.使用dbha服务连接数据库，
[oracle@beijing-fuli-Hadoop-02 admin]$ sqlplus liuwenhe/liuwenhe@dbha
SQL*Plus: Release 11.2.0.4.0 Production on Sat Jul 13 17:11:55 2019
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
确认连接的是主库db2
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
db2
3.异常关闭db2
SQL> shu abort
ORACLE instance shut down.
4.在之前连接好的会话继续查询实例名字，不报错但是卡着，因为主库db2已经关闭了，而dg库
db1还在自动转换中，所以都无法提供服务(大概10秒)，然后连接上了db1:
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
db2
SQL> select instance_name from v$instance; -----卡了10秒大概之后显示了db1
INSTANCE_NAME
----------------
db1
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