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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Distributed Oracle Data Warehouses

HOW ORACLE SNAPSHOTS WORK

Here, you can see that MY_REPLICATED_TABLE is refreshed each morning at 3:00 AM, and the read-only name SNAP$_MY_REPLICATED_TABLE has been replaced with the synonym MY_REPLICATED_TABLE. Following is an example of the snapshot log syntax that needs to be run on the master database:

CREATE SNAPSHOT LOG ON customer_table
TABLESPACE ts2
STORAGE (initial 20k next 20k);


The dbms_snapshot.refresh_all procedure can be run at any time on the DESTINATION data warehouse to refresh the snapshot tables. To force a refresh of an individual table, execute the following:

EXECUTE dbms_snapshot.refresh('office','f');

Note: Any refresh errors are written to the alert.log file.

The snapshot log is a table that resides in the same database as the master table, which can be seen in the Remote DBA_tables view as a table with the name MLOG$_tablename. In our example, the snapshot log would be called MLOG$_CUSTOMER.


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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