如何在高级的复制中切换主体定义站点

2024-07-21 02:42:15

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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 2005Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.Connected to:Oracle9i Enterprise Edition Release 9.2.0.4.0 - ProductionWith the Partitioning optionJServer Release 9.2.0.4.0 - ProductionSQL> 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         beijing6 rows selected.

注意：此时主体站点上对于扶植对象的任何DML操作都不能进行了。

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 CONNERORA-03113: end-of-file on communication channelORA-02068: following severe error from CONNERORA-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。

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.CNORA-06512: at "SYS.DBMS_SYS_ERROR", line 86ORA-06512: at "SYS.DBMS_REPCAT_UTL4", line 2928ORA-06512: at "SYS.DBMS_REPCAT_UTL4", line 2720ORA-06512: at "SYS.DBMS_REPCAT", line 643ORA-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/tigerConnected.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         beijing6 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。

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