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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Distributed Oracle Data Warehouses

USING SNAPSHOTS TO PROPAGATE SUBSETS OF MASTER TABLES

As you have seen, snapshot replication is very handy for taking a master and copying it to a remote location. But, what if we only want to replicate a portion of the tables? Fortunately, Oracle provides a method for excluding certain rows and columns from replicated tables. For example, let’s assume we are replicating a central employee table for use by our New York branch. However, we only want to replicate employee records for those who work at the New York branch, and we want to exclude confidential columns, such as the employee’s salary. The snapshot would appear as follows:

CREATE SNAPSHOT emp_ny
REFRESH FAST
START WITH SYSDATE
NEXT NEXT_DAY(trunc(sysdate),’TUESDAY’)+6/24
AS
SELECT
emp_nbr,
emp_name,
emp_phone,
emp_hire_date
FROM emp@hq WHERE department = ‘NY’;


This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:
http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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