如何在高级的复制中切换主体定义站点

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下面的这个示例是一个同步的复制环境，在同步复制中，任何一个站点Down掉都将会导致数据库服务的中断。

◆1.首先停掉主体的定义站点(CONNER.HURRAY.COM.CN)

[oracle@jumper oracle] $ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Thu Feb 17 16:07:26 2005

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

◆2.登陆的主体站点(TESTORA9.HURRAY.COM.CN)

SQL> select * from dept;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON
        60 ORACLE         BEIJING
        70 oracle         beijing

6 rows selected.

注意：此时主体站点上对于扶植对象的任何DML都不能进行了。

SQL> insert into dept values(80,'oracle','beijing');
insert into dept values(80,'oracle','beijing')
*
ERROR at line 1:
ORA-02068: following severe error from CONNER
ORA-03113: end-of-file on communication channel
ORA-02068: following severe error from CONNER
ORA-03113: end-of-file on communication channel

◆3.然后大家可以使用复制管理员登陆主体站点

假如此时尝试删除复制对象，打破复制关系都会收到错误。

ORA-23312说明这不是主体定义站点。

以下是代码片段：
SQL> connect repadmin/repadmin                                                               
Connected.
SQL> exec DBMS_REPCAT.DROP_MASTER_REPOBJECT(sname => 'scott',oname => 'dept',type => 'table');
BEGIN DBMS_REPCAT.DROP_MASTER_REPOBJECT(sname => 'scott',oname => 'dept',type => 'table'); END;

*
ERROR at line 1:
ORA-23312: not the masterdef according to TESTORA9.HURRAY.COM.CN
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_REPCAT_UTL4", line 2928
ORA-06512: at "SYS.DBMS_REPCAT_UTL4", line 2720
ORA-06512: at "SYS.DBMS_REPCAT", line 643
ORA-06512: at line 1

◆4.此处需要使用DBMS_REPCAT.RELOCATE_MASTERDEF切换主体定义站点

SQL> BEGIN
  2  DBMS_REPCAT.RELOCATE_MASTERDEF (
  3        gname => 'rep_tt',
  4        old_masterdef => 'CONNER.HURRAY.COM.CN',
  5        new_masterdef => 'TESTORA9.HURRAY.COM.CN',
  6        notify_masters => TRUE,
  7        include_old_masterdef => FALSE);
  8  END;
  9  /

PL/SQL procedure successfully completed.

◆5.然后把原主体定义站点(CONNER.HURRAY.COM.CN)从主体库中删除

SQL> execute dbms_repcat.remove_master_databases

(gname=>'rep_tt',master_list=>'CONNER.HURRAY.COM.CN');

PL/SQL procedure successfully completed.

◆6.复制关系被打破以后，DML操作得以继续使用

SQL> connect scott/tiger
Connected.
SQL> select * from dept;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON
        60 ORACLE         BEIJING
        70 oracle         beijing

6 rows selected.

SQL> insert into dept values (80,'oracle','beijing');

1 row created.

SQL> commit;

Commit complete.

SQL>

◆7.假如原站点恢复正常后，大家可以再次添加至复制组中。