Two Different Databases Tables Synchronisation

Question

Hello,
In my case DATABASE A is always updating table TABLE XYZ of DATABASE B through MQ Series using online messages. Due to some reasons that link is down, could any one suggest how we keep continue synchronisation of these two databases, we can not modify any thing on DATABASE A we can only read it as it is master database while DATABSE B is updated by A.
Table of DATABASE A is containing 2 Million records same with B. Can any one let me know how to compare the rows of the tables of each database and if some rows are missing in DATABASE B it should be updated by DATABASE A.
Please suggest any solution so that both databases should be kepy synchroinised at table rows level.
Thanks

Answer 1

Hi,
why post three times the same thread ?
Synchronisation between two databases tables
Synchronisation between two databases tables
updating table TABLE XYZ of DATABASE B through MQ SeriesAnyway, have you think about materialized view through dblink ? A matarialized view can be refresh on commit on master table or at point in time.
To compare table try :
  1* create table tab4 (col1 date, col2 number)
SQL> /
Table created.
SQL> ed
Wrote file afiedt.buf
  1* insert into tab4 values (sysdate,1)
SQL> /
1 row created.
SQL> ed
Wrote file afiedt.buf
  1* insert into tab4 values (sysdate,2)
SQL> /
1 row created.
SQL> ed
Wrote file afiedt.buf
  1* insert into tab4 values (sysdate,3)
SQL> /
1 row created.
SQL> create table tab5 as select * from tab4;
Table created.
SQL> update tab4 set col1 = sysdate where col2=1;
1 row updated.
SQL> select * from tab4
  2  minus
  3  select * from tab5;
COL1            COL2
12-APR-06          1
SQL> So try :
select * from tabA@databaseA
minus
select * from tabB;Nicolas.