Please give me idea now I compile all branch data in head office only new r

Question

Hi master
Sir I have 5 office In different city and one head office in Karachi all branch have same oracle system my question is how I get new data and compile for accumulative reporting
I want only new record and modify record not old record
Old record already I import
When I use oracle import and export tool that no give me right result
If xxx table exists in database then import tool not replace and no insert or no replace with previous data with new modify data
Such as
First time
V_no=897 have debit amount 3998 is Islamabad branch and i export form Islamabad and import in Karachi office
Next time
Islamabad office change v_no=897 debit amount with 76555 and add many new record
I export form Islamabad and import in Karachi office but system no change and not add new record in Karachi office
Please give me idea now I compile all branch data in head office only new record and modify record
Thanks
aamir

Answer 1

Here a very simple example with table EMP, assuming source table has a primary key. Firstly you create a materialized view log on source table (necessary for fast refresh) :
SYS@db102 SQL> conn test/test
Connected.
TEST@db102 SQL> create materialized view log on emp including new values;
Materialized view log created.
TEST@db102 SQL> then at destination DB/user :
TEST@db102 SQL> conn scott/tiger@test10
Connected.
SCOTT@test10 SQL> create database link test
  2  connect to test identified by test
  3  using 'db102';
Database link created.
SCOTT@test10 SQL> create materialized view emp_mv
  2  refresh fast
  3  as select * from emp@test;
Materialized view created.
SCOTT@test10 SQL>Now emp_mv is the exact copy of emp. To refresh the MV, to reflect changes :
SCOTT@test10 SQL> exec dbms_mview.refresh('EMP_MV','F');
PL/SQL procedure successfully completed.
SCOTT@test10 SQL>                                                                  ...but I strongly recommend you to read the documentation...