public String getDBSubnetGroupName() {
        return this.dBSubnetGroupName;
    }
<p>
A DB subnet group for the DB instance. The new DB instance is created in the VPC associated with the DB subnet
group. If no DB subnet group is specified, then the new DB instance isn't created in a VPC.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
If supplied, must match the name of an existing DB subnet group.
</p>
</li>
<li>
<p>
The specified DB subnet group must be in the same Amazon Web Services Region in which the operation is running.
</p>
</li>
<li>
<p>
All read replicas in one Amazon Web Services Region that are created from the same source DB instance must
either:
</p>
<ul>
<li>
<p>
Specify DB subnet groups from the same VPC. All these read replicas are created in the same VPC.
</p>
</li>
<li>
<p>
Not specify a DB subnet group. All these read replicas are created outside of any VPC.
</p>
</li>
</ul>
</li>
</ul>
<p>
Example: <code>mydbsubnetgroup</code>
</p>

@return A DB subnet group for the DB instance. The new DB instance is created in the VPC associated with the DB
        subnet group. If no DB subnet group is specified, then the new DB instance isn't created in a VPC.</p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        If supplied, must match the name of an existing DB subnet group.
        </p>
        </li>
        <li>
        <p>
        The specified DB subnet group must be in the same Amazon Web Services Region in which the operation is
        running.
        </p>
        </li>
        <li>
        <p>
        All read replicas in one Amazon Web Services Region that are created from the same source DB instance
        must either:
        </p>
        <ul>
        <li>
        <p>
        Specify DB subnet groups from the same VPC. All these read replicas are created in the same VPC.
        </p>
        </li>
        <li>
        <p>
        Not specify a DB subnet group. All these read replicas are created outside of any VPC.
        </p>
        </li>
        </ul>
        </li>
        </ul>
        <p>
        Example: <code>mydbsubnetgroup</code>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/CreateDBInstanceReadReplicaRequest.java