@Override
    public DBParameterGroup copyDBParameterGroup(CopyDBParameterGroupRequest request) {
        request = beforeClientExecution(request);
        return executeCopyDBParameterGroup(request);
    }
<p>
Copies the specified DB parameter group.
</p>
<note>
<p>
You can't copy a default DB parameter group. Instead, create a new custom DB parameter group, which copies the
default parameters and values for the specified DB parameter group family.
</p>
</note>

@param copyDBParameterGroupRequest
@return Result of the CopyDBParameterGroup operation returned by the service.
@throws DBParameterGroupNotFoundException
        <code>DBParameterGroupName</code> doesn't refer to an existing DB parameter group.
@throws DBParameterGroupAlreadyExistsException
        A DB parameter group with the same name exists.
@throws DBParameterGroupQuotaExceededException
        The request would result in the user exceeding the allowed number of DB parameter groups.
@sample AmazonRDS.CopyDBParameterGroup
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/CopyDBParameterGroup" target="_top">AWS API
     Documentation</a>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/AmazonRDSClient.java