高级复制中如何应对主体站点故障
作者:eygle
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
