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<h1>11. Data Replication, Synchronization and Transformation Services</h1>
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<h2>11.1. Introduction</h2>
<p>Virtuoso provides several replication methods:</p>
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<h3>11.1.1. Snapshot replication</h3>
Virtuoso provides the following flavors of snapshot replication:
<ul>
<li>
<p>Non-incremental snapshot replication</p>
<p>Non-incremental snapshot replication is useful when the data
is changed infrequently or when data is modified in large portions
at a time.
</p>
</li>
<li>
<p>Incremental snapshot replication</p>
<p>Incremental snapshot replication is useful when
the data is changed frequently and implements incremental
updates using a snapshot log.</p>
</li>
<li>
<p>Bi-directional snapshot replication</p>
<p>Bi-directional snapshot replication allows data to be modified
on both publisher and subscribers. This is useful
read-write access to the replicas is needed.</p>
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<p>Snapshot replication can be used in heterogeneous environments
to set up replication between non-Virtuoso databases.</p>
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<h3>11.1.2. Transactional replication</h3>
<p>Transactional replication allows subscribers to receive data
in near-real time. ACID properties of transactions are maintained
in transactional replication as well. Virtuoso implements the following
flavors of transactional replication:
<ul>
<li>
<p>Ordinary transactional replication</p>
<p>Ordinary transactional replication flavor implements one-way data
replication and is useful when data can be modified on only one server
with other servers participating in replication providing read-only
data access.</p>
</li>
<li>
<p>Bi-directional transactional replication</p>
<p>Bi-directional transactional replication is useful when there is
a requirement to allow data updates on multiple servers.</p>
</li>
</ul>
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