How it can be achieved ?

Question

Hi,
I am having two servers one at london another in new york. On London server I can not do any changes in database while in new york server I can do any changes and I want to replicate a data of a single table london server to new york server.
Suppose in London server I have table call 'a' which should be replaced on newyork server. Table 'a' is currently having less number of insert records and no deletees and expected to large no of rows in future.
How can I achive this ? I thought using mv on newyork server using refresh fast but I can not create mv log in london server I had tried this
drop database link s0055;
create database link s0055
connect to scott
identified by tiger
using 'test'
create materialized view log on t@s0055 with rowid;
create materialized view t
with rowid
as
select *
from t@s0055
11:33:17 SQL> @benoit
Database link dropped.
Database link created.
create materialized view log on t@s0055 with rowid
ERROR at line 1:
ORA-00949: illegal reference to remote database
with rowid
ERROR at line 2:
ORA-00905: missing keyword
Kindly suggest urgently.
thanks & regards
PJP

Answer 1

Can you use MERGE statement to cynchronize two tables???
create database link remote_db_scott
connect to scott identified by tiger using 'v9'
NOW USE FOLLOWING QUERY TO ACCESS REMOTE EMP
select * from emp@remote_db_scott;
CREATE A SYNONYM FOR "emp@remote_db_scott"
create synonym remoteEMP for emp@main_db_scott;
NOW REMOTE EMP CAN BE ACCESSES USING THIS SYNONYM
select * from remoteEMP;
WRITING A MERGE STATEMENT TO SYNCHRONIZE THE LOCAL EMP TABLE WITH REMOTE EMP TABLE. THIS STATEMENT WILL
ADD NEW ROWN AND ALSO UPDATE EXISTING ROIWS TO SYNCHRONIZE THE LOCAL EMP TABLE WITH REMOTE EMP TABLE BUT IF SOMT ROWS HAVE
BEEN DELETED FROM THE REMOTE EMP. THOSE WILL STILL REMAIN IN LOCAL EMP
merge into emp le using remoteEMP re on (le.empno=re.empno)
when matched then
update set le.ename=re.ename,le.job=re.job,le.mgr=re.mgr,le.hiredate=re.hiredate,le.sal=re.sal,le.comm=re.comm,le.deptno=re.deptno
when not matched then
insert values(re.empno,re.ename,re.job,re.mgr,re.hiredate,re.sal,re.comm,re.deptno);
FOR SYNCHRONIZATION OF DELETE ROWN IN REMOTE TABLE, USE FOLLOWING STATEMENT
delete from emp where empno not in(select empno from remoteEMP);