Oracle??™s replication capabilities are delivered today in the Oracle Streams product.
Streams includes log-based replication and Advanced Queues and is covered in more
detail in Chapter 13.
Key considerations in setting up a replication environment include the following:
Tolerance for data divergence
The smaller the data divergence, the more individual replication actions will
have to be performed. You will reduce the resources needed to implement the
replication by increasing the data divergence.
Performance requirements
Since replication requires resources, it can have an impact on performance.
However, since Oracle Database 10g, Oracle Streams can capture change data
from log files, which greatly reduces the performance impact of replication on an
active database.
Network bandwidth
Since replication uses network bandwidth, you have to consider the availability
of this resource.
Distance between sites
The more distance between sites, the longer the physical transfer of data will
take and the longer each application will take.
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