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  Oracle Replication Tips by Burleson

Updating Oracle Materialized View Data

Materialized Views for replication are updated based either on a specific replication schedule or on demand. A refresh interval is defined when the materialized view is created on the remote site.  Oracle automatically creates a job to execute the refresh at the defined interval.  To create an Materialized View with a scheduled refresh, you would use the REFRESH FAST syntax, as demonstrated in the next example:

CREATE MATERIALIZED VIEW employees
REFRESH FAST NEXT sysdate + 1 AS
SELECT * FROM emp_user.employee@proddb;

This will cause an Materialized View called “employees” to be created. The Materialized View will be fast-refreshed every day at roughly the same time.

There are two other refresh methods that you can select when creating an Materialized View. The following table provides details about all three:

REFRESH METHOD

DESCRIPTION

NOTES

Fast

Causes replication based on row level changes.

Requires an Materialized View log be created at the master site.


This is an excerpt from Oracle Replication By Rampant TechPress (only $19.95).  You can click here to order a copy and get instant access to the code depot:

http://www.rampant-books.com/book_2003_2_replication.htm


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