高级复制中如何应对主体站点故障

高级复制中如何应对主体站点故障

作者:eygle

出处:http://blog.eygle.com

日期:February 18, 2005

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在同步复制中
一旦任意主体站点出现故障，数据库将会出现问题。

SQL> select * from scott.dept; DEPTNO DNAME LOC ------ -------------- ------------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON 33 ORACLE beijing 35 Oracle Beijing 6 rows selected SQL>

此时DML操作不能进行

SQL> insert into scott.dept values (36,'Oracle','Beijing'); insert into scott.dept values (36,'Oracle','Beijing') ORA-02068: following severe error from TESTORA9 ORA-03113: end-of-file on communication channel ORA-02068: following severe error from TESTORA9 ORA-03113: end-of-file on communication channel SQL> select gname,dblink,masterdef from dba_repsites; GNAME DBLINK MASTERDEF ------------------------------ ---------------------------------- REP_TT CONNER.HURRAY.COM.CN Y REP_TT TESTORA9.HURRAY.COM.CN N

简单的,我们可以移除出问题的主体站点

SQL> exec dbms_repcat.remove_master_databases(gname => 'rep_tt',master_list => 'TESTORA9.HURRAY.COM.CN'); PL/SQL procedure successfully completed

此后DML操作可以继续:

SQL> insert into scott.dept values (36,'Oracle','Beijing'); 1 row inserted SQL> COMMIT; Commit complete SQL> select gname,dblink,masterdef from dba_repsites; GNAME DBLINK MASTERDEF ------------------------------ ---------------------------------- REP_TT CONNER.HURRAY.COM.CN Y

如果故障站点修复之后，需要重新加入复制组，可以先在故障站点删除复制组:

SQL> exec dbms_repcat.drop_master_repgroup(gname => 'rep_tt',drop_contents => false,all_sites => false) PL/SQL procedure successfully completed

然后在主体定义站点重新加入该主体站点:

SQL> exec dbms_repcat.suspend_master_activity(gname => 'rep_tt') PL/SQL procedure successfully completed SQL> execute dbms_repcat.add_master_database(gname=>'rep_tt', master=>'TESTORA9.HURRAY.COM.CN',use_existing_objects=>true, copy_rows=>false, propagation_mode => 'synchronous'); PL/SQL procedure successfully completed SQL> execute dbms_repcat.resume_master_activity('rep_tt',true); PL/SQL procedure successfully completed SQL>

此时复制恢复正常。
接下来你需要解决的是数据冲突，可以参考: 使用 dbms_rectifier_diff解决高级复制中的数据冲突问题