GoldenGate 反向切换步骤

Posted 2020-10-07 长城之上是千亿的星空，星空之上是不灭的守望。

1 事先配置好反向复制链路；

 

2 停止源端的应用程序;

 

3 确认源端Capture已捕获所有的Redo信息；

GGSCI>info all

GGSCI>info ext_app

 

4 确认源端所有queue中无积压数据

GGSCI>info all

GGSCI>info ext_app

GGSCI>info pmp_app

 

5 把源端的压缩表和要复制的接口表等复制到目标端;

 

6 确认目标端的sequence的next_value大于等于源端的值，如不满足要求需要对目标端的

sequence进行调整;

 

7 比对源端和目标端表的数据是否一致;[minus或者count(*)或者hash value对比]；或用

vardata工具抽样进行全表对比；

 

8 启用目标端的约束和外键以及job；

select ‘alter table ‘||owner||‘.‘||table_name||‘ enable constraint ‘||constraint_name||‘;‘

from dba_constraints

where constraint_type in (‘R‘) and

owner in(‘APPUSR‘)

order by status,owner;

select ‘alter trigger ‘||owner||‘.‘||trigger_name||‘ enable;‘

from dba_triggers

where owner in(‘APPUSR‘)

order by status,owner;

SQL>alter system set job_processes=10 scope=both sid=’*’;

 

9 停止源端的约束和外键以及job;

select ‘alter table ‘||owner||‘.‘||table_name||‘ disable constraint ‘||constraint_name||‘;‘

from dba_constraints

where constraint_type in (‘R‘) and

owner in(‘APPUSR‘)

order by status,owner;

select ‘alter trigger ‘||owner||‘.‘||trigger_name||‘ disable;‘

from dba_triggers

where owner in(‘APPUSR‘)

order by status,owner;

SQL>alter system set job_processes=0 scope=both sid=’*’;

 

10 启动反向复制的Capture进程，如有可能启动DataPump进程;

 

11 把应用程序切换到目标端;

 

12 确认目标端Capture进程状态正常；

 

13 源端数据库修复后,需要进行反向回切,在此过程中可能需要将数据库从目标端初始化到源端，视具体情况而定；

 

14 启动反向复制DataPump进程和Replicat进程，将数据从目标端Apply到源端;

 

15 停止目标端的应用

 

16 确认源端的Replicat队列没有数据了；

 

17 把目标端的压缩表和要复制的接口表等复制到源端

 

18 比对源端和目标端表的数据是否一致;[minus或者count(*)或者hash value对比]

Internal Partner Win Story

19 确认源端的sequence的next_value大于等于目标端的值，如果不是，则需要调整源端的Sequence;

 

20 启用源端的trigger和约束，以及job

select ‘alter table ‘||owner||‘.‘||table_name||‘ enable constraint ‘||constraint_name||‘;‘

from dba_constraints

where constraint_type in (‘R‘) and

owner in(‘APPUSR‘)

order by status,owner;

select ‘alter trigger ‘||owner||‘.‘||trigger_name||‘ enable;‘

from dba_triggers

where owner in(‘APPUSR‘)

order by status,owner;

SQL>alter system set job_processes=10 scope=both sid=’*’;

 

21 停止目标端的约束和外键以及job

select ‘alter table ‘||owner||‘.‘||table_name||‘ disable constraint ‘||constraint_name||‘;‘

from dba_constraints

where constraint_type in (‘R‘) and

owner in(‘APPUSR‘)

order by status,owner;

select ‘alter trigger ‘||owner||‘.‘||trigger_name||‘ disable;‘

from dba_triggers

where owner in(‘APPUSR‘)

order by status,owner;

SQL>alter system set job_processes=0 scope=both sid=’*’;

 

22 启动目标端的Replicat

 

23 源端启用应用,回切完成