oracle数据库主主复制

oracle 复制基于表复制配置过程；

规划：

检查oarcle数据库是否支持高级复制功能，true

>Select value from v$OPTION where parameter='advanced replicaiont'

2,是否支持global_names

(当GLOBAL_NAMES参数设置为TRUE时，使用DATABASE LINK时，DATABASE LINK的名称必须与被链接库的GLOBAL_NAME一致)

 

>show parameter global_names ;结果为true

查看global_name配置：

>select * from global_name;

3，查看job_queue_processes; 在0-1000之间

>show parameter job_queue_processes;

 

4，查看open_links

>show parameter open_links; default：4 不可更改

5,查看全局数据库名称：

>select * from global_name;

6，设置全局数据库名称（安装过程当中因为字符串长度等缘由，实际global_name配置不正确，安装完成更改便可。不然dblink链接不上）：

>alter database rename global_name to masterone.test.com;

>alter database rename global_name to mastertwo.test.com;

1，建立数据库，
    全局数据库名称分别为：masterone.test.com/mastertwo.test.com
    Serivce name 分别为：masterone.test.com/mastertwo.test.com
2，在两个数据库中tnsnames.ora配置客户访问：配置内容以下：
    MASTERTWO =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = mastertwo.test.com)(PORT = 1521))
        (CONNECT_DATA =
          (SERVER = DEDICATED)
          (SERVICE_NAME = mastertwo.test.com)
        )
      )
    MASTERONE =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = masterone.test.com)(PORT = 1521))
        (CONNECT_DATA =
          (SERVER = DEDICATED)
          (SERVICE_NAME = masterone.test.com)
        )
      )
    
3，打开SQL Plus测试连接（保证数据库可联通）
    >connect system@masterone;
    >connect system@mastertwo;
4，建立replication admin ，使用system链接masterone.test.com数据库；
5，建立repadmin 执行命令
     Create user repadmin identified by repadmin;
6，赋予repadmin用户能够建立和管理复制环境的权限
    Exec dbms_repcat_admin.grant_admin_any_schema(username=>'repadmin');
    Grant comment any table to repadmin;
    Grant lock any table to repadmin;
    若是使用OEM管理工具，还需执行以下命令：
    GRANT SELECT ANY DICTIONARY TO repadmin;
7，注册repadmin为传播函数
    Exec dbms_defer_sys.register_propagator(username=>'repadmin');
8，注册repadmin为接受函数
        BEGIN
           DBMS_REPCAT_ADMIN.REGISTER_USER_REPGROUP (
              username => 'repadmin',
              privilege_type => 'receiver',
              list_of_gnames => NULL);
        END;
9，为了在检查时保持延迟事务队列的大小, 您应该清除已成功完成的延迟事务。SCHEDULE_PURGE 过程为您自动清除过程。使用repadmin登录数据库
    Connect repadmin;
    
    BEGIN
       DBMS_DEFER_SYS.SCHEDULE_PURGE (
          next_date => SYSDATE,
          interval => 'SYSDATE + 1/24',
          delay_seconds => 0);
    END;
10，在mastertwo.mor.cr上执行相同操做4-9；

11，使用system在masterone.test.com上建立共有dblink
    Connect system@masterone
    Create public datebase link mastertwo.test.com using 'mastertwo';
    
    Connect repadmin@masterone
    Create database link mastertwo.test.com connect to repadmin identified by repadmin;
    
    使用system在mastertwo.test.com上建立共有dblink
    Connect system@mastertwo;
    Create public database link masterone.test.com using 'masterone';
    
    Connect repadmin@mastertwo
    Create database link masterone.mor.cr connect to repadmin identified by repadmin;
    
12，使用repadmin登录masterone.test.com/mastertwo.test.com
    Connect repadmin@masterone
    BEGIN
       DBMS_DEFER_SYS.SCHEDULE_PUSH (
          destination => 'mastertwo.test.com',
          interval => 'SYSDATE + (1/144)',
          next_date => SYSDATE,
          parallelism => 1,
          execution_seconds => 1500,
          delay_seconds => 1200); /*延迟时间能够设置小一点*/
    END;
    
    Connect repadmin@mastertwo
    BEGIN
       DBMS_DEFER_SYS.SCHEDULE_PUSH (
          destination => 'masterone.test.com',
          interval => 'SYSDATE + (1/144)',
          next_date => SYSDATE,
          parallelism => 1,
          execution_seconds => 1500,
          delay_seconds => 1200);
    END;
    
13，建立master group
    
    在建立同步组以前应该确保复制环境的中的每一个数据库中有相同的schema和表结构。例如在测试环境中定义的schema为hr，表结构为test
    
    只在master site上执行此操做：masterone.test.com做为master site
    Connect repadmin@masterone
    
    Exec dbms_repcat.create_master_repgroup('hrgroup')
14，向master group中添加object
    
    BEGIN
       DBMS_REPCAT.CREATE_MASTER_REPOBJECT (
          gname => 'hrgroup',
          type => 'TABLE',
          oname => 'test',
          sname => 'hr',
          use_existing_object => TRUE,
          copy_rows => FALSE);
    END;
    
15，添加额外的master site
    BEGIN
       DBMS_REPCAT.ADD_MASTER_DATABASE (
          gname => 'hrgroup',
          master => 'mastertwo.test.com',
          use_existing_objects => TRUE,
          copy_rows => FALSE,
          propagation_mode => 'ASYNCHRONOUS');
    END;
    
    使用以下命令检查，若是出现两个数据库的链接则操做成功
    SELECT DBLINK FROM DBA_REPSITES WHERE GNAME = 'HRGROUP';
    mastertwo.test.com
    masterone.test.com
    
16，添加复制支持
    
    BEGIN 
        DBMS_REPCAT.GENERATE_REPLICATION_SUPPORT (
          sname => 'hr',
          oname => 'test', 
          type => 'TABLE',
          min_communication => TRUE); 
    END;
    
    完成检查经过命令检查，返回0可继续执行
    SELECT COUNT(*) FROM DBA_REPCATLOG WHERE GNAME = 'HRGROUP';
17，启用复制
    BEGIN 
       DBMS_REPCAT.RESUME_MASTER_ACTIVITY (
          gname => 'hrgroup'); 
    END;
18，测试
    在masterone.test.com上hr.test表中分别经过进行增删改操做
        Insert into hr.test values (1,'testuser1');
        Commit;(在SQL Plus上操道别忘提交)
    因为复制延迟为1200，毫秒因此不会很快同步到mastertwo.test.com上

参考地址：https://docs.oracle.com/cd/B28359_01/server.111/b28327/rarmastergroup.htm#i1004613