怎么实现物理DataGuard客户端无缝切换
这篇文章主要讲解了"怎么实现物理DataGuard客户端无缝切换"，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习"怎么实现物理DataGuard客户端无缝切换"吧！
项目客户一直想实现DataGuard的主备切换的自动化，即主库故障后自动切换到备库，并此过程要让应用感知。咨询了DG broker后，考虑到其可用性，易用性，和license问题，放弃了broker。但是物理备库切换到主库还是可以实现对应用透明的。之前我有篇歪门邪道的文章，通过linux系统的IP漂移设置，实现主备切换对应用的透明。对于oracle 11g的dataguard switchover,可以通过创建触发器方式实现自动切换。下面是主要操作步骤：
主库执行：
1.创建service
begin
DBMS_SERVICE.CREATE_SERVICE(service_name => 'dg_taf_pri',
network_name => 'dg_taf_pri',
aq_ha_notifications => TRUE,
failover_method => 'BASIC',
failover_type => 'SELECT',
failover_retries => 30,
failover_delay => 5);
end;
/
2.创建存储过程，主库启动service监听
create or replace procedure dg_taf_proc is
v_role VARCHAR(30);
begin
select DATABASE_ROLE into v_role from V$DATABASE;
if v_role = 'PRIMARY' then
DBMS_SERVICE.START_SERVICE('dg_taf_pri');
else
DBMS_SERVICE.STOP_SERVICE('dg_taf_pri');
end if;
end;
/
select owner,object_name ,procedure_name from dba_procedures where procedure_name='dg_taf_proc'; --procedure_name列出package中的procedure、function
select owner,object_name ,procedure_name from dba_procedures where object_name='DG_TAF_PROC';
select distinct name,owner from dba_source where name like 'DG_TAF_PROC%';
3.创建触发器，主备切换时触发
create or replace TRIGGER dg_taf_trg_startup
after startup or db_role_change on database
begin
dg_taf_proc;
end;
/
select trigger_name, trigger_name
from dba_triggers where trigger_name = 'DG_TAF_TRG_STARTUP';
4.客户端配置：
dg_taf =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = tcp)(HOST = 12.12.12.123)(PORT = 1521))
(ADDRESS = (PROTOCOL = tcp)(HOST = 12.12.12.125)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = dg_taf_pri)
(FAILOVER_MODE =
(TYPE = session)
(METHOD = basic)
(RETRIES = 180)
(DELAY = 5)
)
)
)
感谢各位的阅读，以上就是"怎么实现物理DataGuard客户端无缝切换"的内容了，经过本文的学习后，相信大家对怎么实现物理DataGuard客户端无缝切换这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！
