public String getDBParameterGroupName() {
        return this.dBParameterGroupName;
    }
<p>
The name of the DB parameter group to associate with this DB instance.
</p>
<p>
If you don't specify a value for <code>DBParameterGroupName</code>, then Amazon RDS uses the
<code>DBParameterGroup</code> of the source DB instance for a same Region read replica, or the default
<code>DBParameterGroup</code> for the specified DB engine for a cross-Region read replica.
</p>
<p>
Specifying a parameter group for this operation is only supported for MySQL DB instances for cross-Region read
replicas and for Oracle DB instances. It isn't supported for MySQL DB instances for same Region read replicas or
for RDS Custom.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Must be 1 to 255 letters, numbers, or hyphens.
</p>
</li>
<li>
<p>
First character must be a letter.
</p>
</li>
<li>
<p>
Can't end with a hyphen or contain two consecutive hyphens.
</p>
</li>
</ul>

@return The name of the DB parameter group to associate with this DB instance.</p>
        <p>
        If you don't specify a value for <code>DBParameterGroupName</code>, then Amazon RDS uses the
        <code>DBParameterGroup</code> of the source DB instance for a same Region read replica, or the default
        <code>DBParameterGroup</code> for the specified DB engine for a cross-Region read replica.
        </p>
        <p>
        Specifying a parameter group for this operation is only supported for MySQL DB instances for cross-Region
        read replicas and for Oracle DB instances. It isn't supported for MySQL DB instances for same Region read
        replicas or for RDS Custom.
        </p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        Must be 1 to 255 letters, numbers, or hyphens.
        </p>
        </li>
        <li>
        <p>
        First character must be a letter.
        </p>
        </li>
        <li>
        <p>
        Can't end with a hyphen or contain two consecutive hyphens.
        </p>
        </li>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/CreateDBInstanceReadReplicaRequest.java