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怎么實(shí)現(xiàn)物理DataGuard客戶端無(wú)縫切換

這篇文章主要講解了“怎么實(shí)現(xiàn)物理DataGuard客戶端無(wú)縫切換”,文中的講解內(nèi)容簡(jiǎn)單清晰,易于學(xué)習(xí)與理解,下面請(qǐng)大家跟著小編的思路慢慢深入,一起來研究和學(xué)習(xí)“怎么實(shí)現(xiàn)物理DataGuard客戶端無(wú)縫切換”吧!

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    項(xiàng)目客戶一直想實(shí)現(xiàn)DataGuard的主備切換的自動(dòng)化,即主庫(kù)故障后自動(dòng)切換到備庫(kù),并此過程要讓應(yīng)用感知。咨詢了DG broker后,考慮到其可用性,易用性,和license問題,放棄了broker。但是物理備庫(kù)切換到主庫(kù)還是可以實(shí)現(xiàn)對(duì)應(yīng)用透明的。之前我有篇歪門邪道的文章,通過linux系統(tǒng)的IP漂移設(shè)置,實(shí)現(xiàn)主備切換對(duì)應(yīng)用的透明。對(duì)于oracle 11g的dataguard switchover,可以通過創(chuàng)建觸發(fā)器方式實(shí)現(xiàn)自動(dòng)切換。下面是主要操作步驟:

主庫(kù)執(zhí)行:

1.創(chuàng)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.創(chuàng)建存儲(chǔ)過程,主庫(kù)啟動(dòng)service監(jiān)聽

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.創(chuàng)建觸發(fā)器,主備切換時(shí)觸發(fā)

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.客戶端配置:

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)

               )

        )

)

感謝各位的閱讀,以上就是“怎么實(shí)現(xiàn)物理DataGuard客戶端無(wú)縫切換”的內(nèi)容了,經(jīng)過本文的學(xué)習(xí)后,相信大家對(duì)怎么實(shí)現(xiàn)物理DataGuard客戶端無(wú)縫切換這一問題有了更深刻的體會(huì),具體使用情況還需要大家實(shí)踐驗(yàn)證。這里是創(chuàng)新互聯(lián),小編將為大家推送更多相關(guān)知識(shí)點(diǎn)的文章,歡迎關(guān)注!


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