oracle 復制基於表復制配置過程；

規劃：

檢查oarcle數據庫是否支持高級復制功能，true

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

2,是否支持global_names

(當GLOBAL_NAMES參數設置為TRUE時，使用DATABASE LINK時，DATABASE LINK的名稱必須與被連接庫的GLOBAL_NAME一致)

>show parameter global_names ;結果為true

查看global_name配置：

>select * from global_name;

3，查看job_queue_processes; 在0-1000之間

>show parameter job_queue_processes;

4，查看open_links

>show parameter open_links; default：4 不可更改

5,查看全局數據庫名稱：

>select * from global_name;

6，設置全局數據庫名稱（安裝過程中由於字符串長度等原因，實際global_name配置不正確，安裝完成更改即可。否則dblink連接不上）：

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

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

1，創建數據庫，
    全局數據庫名稱分別為：masterone.test.com/mastertwo.test.com
    Serivce name 分別為：masterone.test.com/mastertwo.test.com
2，在兩個數據庫中tnsnames.ora配置客戶訪問：配置內容如下：
    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，打開SQL Plus測試鏈接（保證數據庫可聯通）
    >connect system@masterone;
    >connect system@mastertwo;
4，創建replication admin ，使用system連接masterone.test.com數據庫；
5，創建repadmin 執行命令
     Create user repadmin identified by repadmin;
6，賦予repadmin用戶可以創建和管理復制環境的權限
    Exec dbms_repcat_admin.grant_admin_any_schema(username=>‘repadmin‘);
    Grant comment any table to repadmin;
    Grant lock any table to repadmin;
    如果使用OEM管理工具，還需執行如下命令：
    GRANT SELECT ANY DICTIONARY TO repadmin;
7，註冊repadmin為傳播函數
    Exec dbms_defer_sys.register_propagator(username=>‘repadmin‘);
8，註冊repadmin為接受函數
        BEGIN
           DBMS_REPCAT_ADMIN.REGISTER_USER_REPGROUP (
              username => ‘repadmin‘,
              privilege_type => ‘receiver‘,
              list_of_gnames => NULL);
        END;
9，為了在檢查時保持延遲事務隊列的大小, 您應該清除已成功完成的延遲事務。SCHEDULE_PURGE 過程為您自動清除過程。使用repadmin登陸數據庫
    Connect repadmin;
    
    BEGIN
       DBMS_DEFER_SYS.SCHEDULE_PURGE (
          next_date => SYSDATE,
          interval => ‘SYSDATE + 1/24‘,
          delay_seconds => 0);
    END;
10，在mastertwo.mor.cr上執行相同操作4-9；

11，使用system在masterone.test.com上創建共有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上創建共有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登陸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); /*延遲時間可以設置小一點*/
    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，創建master group
    
    在創建同步組之前應該確保復制環境的中的每個數據庫中有相同的schema和表結構。例如在測試環境中定義的schema為hr，表結構為test
    
    只在master site上執行此操作：masterone.test.com作為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，添加額外的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;
    
    使用如下命令檢查，如果出現兩個數據庫的連接則操作成功
    SELECT DBLINK FROM DBA_REPSITES WHERE GNAME = ‘HRGROUP‘;
    mastertwo.test.com
    masterone.test.com
    
16，添加復制支持
    
    BEGIN 
        DBMS_REPCAT.GENERATE_REPLICATION_SUPPORT (
          sname => ‘hr‘,
          oname => ‘test‘, 
          type => ‘TABLE‘,
          min_communication => TRUE); 
    END;
    
    完成檢查通過命令檢查，返回0可繼續執行
    SELECT COUNT(*) FROM DBA_REPCATLOG WHERE GNAME = ‘HRGROUP‘;
17，啟用復制
    BEGIN 
       DBMS_REPCAT.RESUME_MASTER_ACTIVITY (
          gname => ‘hrgroup‘); 
    END;
18，測試
    在masterone.test.com上hr.test表中分別通過進行增刪改操作
        Insert into hr.test values (1,‘testuser1‘);
        Commit;(在SQL Plus上操作別忘提交)
    由於復制延遲為1200，毫秒所以不會很快同步到mastertwo.test.com上

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

oracle數據庫主主復制