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Distributed Query Processing

Oracle Tips by Burleson Consulting

The Data Warehouse Development Life Cycle

Distributed Oracle Data Warehouses

Distributed Query Processing

Within Oracle, distributed query processing is much more than the ability to execute a query against more than one database. In Oracle, a distributed query splits the execution, sharing resources from each Oracle instance. In Oracle warehouses, a distributed query might query data items from widely distributed databases in a single query. For example, consider the following:

SELECT CUSTOMER.name, CUSTOMER.address, ORDER.order_number,
ORDER.order_date
FROM customer@tokyo, order@paris
SEE CODE DEPOT FOR FULL SCRIPT


Letís assume that the query is initiated from an Oracle database in New York. The retrieval of the rows from Tokyo and Paris will take place using the resources on their respective Oracle instances, while the New York host will perform the merge join of the results from the customer and order queries.


This is an excerpt from "High Performance Data Warehousing", copyright 1997.

If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.

 
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