高级复制中如何应对主体站点故障

文章作者 100test 发表时间 2008:01:28 09:07:39
来源 100Test.Com百考试题网

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> 0select * from scott.dept.DEPTNO DNAME LOC------ -------------- ------------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON 33 ORACLE beijing 35 Oracle Beijing6 rows 0selectedSQL>

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 TESTORA9ORA-03113: end-of-file on communication channelORA-02068: following severe error from TESTORA9ORA-03113: end-of-file on communication channelSQL> 0select 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 insertedSQL> COMMIT.Commit completeSQL> 0select 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.0drop_master_repgroup(gname => @#rep_tt@#,0drop_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 completedSQL> 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 completedSQL> execute dbms_repcat.resume_master_activity(@#rep_tt@#,true).PL/SQL procedure successfully completedSQL>

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