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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Distributed Oracle Data Warehouses

REAL-WORLD TIPS AND TECHNIQUES FOR ORACLE SNAPSHOTS

For very static tables, designers can specify refreshes to run quarterly. The following example refreshes a table completely on the first Tuesday of each quarter:

CREATE SNAPSHOT cust_snap1
REFRESH COMPLETE
START WITH SYSDATE
NEXT NEXT_DAY(ADD_MONTHS(trunc(sysdate,’Q’),3),’TUESDAY’)
AS SELECT cust_nbr, cust_name FROM customer@hq

For dynamic tables that require refreshing daily, designers can specify that a table is refreshed at 11:00 AM each day:

CREATE SNAPSHOT cust_snap1
REFRESH FAST
START WITH SYSDATE
NEXT SYSDATE+11/24
AS SELECT cust_nbr, cust_name FROM customer@hq
SEE CODE DEPOT FOR FULL SCRIPT


In addition to using a time range specified in the CREATE SNAPSHOT syntax, you can also use Oracle stored procedures to achieve the same results. If you run the dbmssnap.sql script, you can refresh a snapshot by issuing the following command:

EXECUTE dbms_snapshot.refresh(‘customer’,’c’); /* complete refresh */
EXECUTE dbms_snapshot.refresh(‘customer’,’f’); /* forced refresh */
EXECUTE dbms_snapshot.refresh(‘customer’,’?’); /* fast refresh */


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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