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  Oracle Replication Tips by Burleson

Oracle Materialized View Logs

In most situations, you will want the data in the Materialized View to be as current as possible. Also, many applications cannot tolerate data divergence, a difference between the data at the master site and the Materialized View site. Materialized View Logs (Materialized View Logs), created at the master site, allow Oracle to keep track of changes to the master table. Materialized View logs are created through the CREATE MATERIALIZED VIEW LOG command.

Materialized View Logs are used to apply row level changes to the remote Materialized View sites. Materialized View Logs can be created either on a table’s primary key or on the table’s ROWID, or you can create an Materialized View log on a combination of primary keys and ROWIDs.

The Materialized View log should be created on the primary key of the table whenever possible, as the use of the primary key involves fewer restrictions. In any case, materialized views used for replication must be rebuilt if the structure of the underlying table is changed.

Also, ROWID-based Materialized Views and Materialized View logs are impacted by reorganization and truncate operations on the source table.  In the cases of reorganization and truncate operations, you will need to completely refresh the Materialized Views built on that table.

Here is an example of the creation of an Materialized View Log based on the primary key (the default) of the master table:

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:

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