View using db link

Question

I have 3 databases with identical table structure installed in 3 different servers.(East ,West & South) To view consumers bill information
from any database I am using view with db link.
v_bill_CASH_data is base view created in every datbase
In east database my script for view creation is
create or replace view v_atp_bill_data as
select *
from v_bill_CASH_data
union
select *
from v_bill_CASH_data@westg
union
select *
from v_bill_CASH_data@southg;
where westg and southg are db links to connect to database of west and south.
The problem is when any one of the machine is not up I am not able to view consumer's data in other two database.
Should I change the script of view v_atp_bill_data or other way around?

Answer 1

You should go in various directions
a) make sure all databases are up 7 x 24, do not run this code during scheduled maintenance of any of the databases.
b) Included proper error trapping
c) consider consolidating three databases into one, adding an extra column, partioning on that column
d) consider using Advanced Replication, Streams or Change Data Capture, or whatever applies to your version to make sure all data is available everywhere,
when c) isn't possible.
All other 'solutions' are doomed to failure,
Sybrand Bakker
Senior Oracle DBA