@Override
    public DeleteDBSubnetGroupResult deleteDBSubnetGroup(DeleteDBSubnetGroupRequest request) {
        request = beforeClientExecution(request);
        return executeDeleteDBSubnetGroup(request);
    }
<p>
Deletes a DB subnet group.
</p>
<note>
<p>
The specified database subnet group must not be associated with any DB instances.
</p>
</note>

@param deleteDBSubnetGroupRequest
@return Result of the DeleteDBSubnetGroup operation returned by the service.
@throws InvalidDBSubnetGroupStateException
        The DB subnet group cannot be deleted because it's in use.
@throws InvalidDBSubnetStateException
        The DB subnet isn't in the <i>available</i> state.
@throws DBSubnetGroupNotFoundException
        <code>DBSubnetGroupName</code> doesn't refer to an existing DB subnet group.
@sample AmazonRDS.DeleteDBSubnetGroup
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/DeleteDBSubnetGroup" target="_top">AWS API
     Documentation</a>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/AmazonRDSClient.java