||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 17 -
Oracle’s Grid Integration Technologies
Streams Methodology allows users to enqueue messages, propagate
messages to subscribing queues, and dequeue messages. When the Streams
method is utilized for data replication, it captures the DML and DDL
changes made to the database objects and then replicates those changes
to one or more destination databases, the so called consumers or
to the event management and notification mechanism, the Streams
Methodology provides a powerful communication infrastructure.
Applications can enqueue an event explicitly or a database event can
be captured implicitly. Such events, being dequeued at a destination
environment, may very well serve as a notification mechanism. For
instance, events pushed to a queue may be dequeued by a messaging
application and then used to generate e-mail notification or a
wireless message, based on the type of event content.
a data warehouse involves periodic data refreshing and summarizing or
analyzing loads of data. Operational data is fed into a data warehouse
by a typical ETL (Extract, Transform, and Load) mechanism.
Streams-based feed mechanisms can capture the necessary data changes
from the operational database and send it to the destination data
warehouse. The use of redo information by the Streams capture process
avoids unnecessary overhead on the production database. As the apply
process allows transformation or selection of data at the consumer
end, data loading gets additional flexibility to reformat and update
the data warehouses with the received information.
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