ClickHouse/tests/integration/test_config_xml_main/configs/users.xml

<clickhouse>
    <profiles>
        <default>
            <max_memory_usage>10000000000</max_memory_usage>
            <max_block_size>64999</max_block_size>
        </default>
    </profiles>

    <users>
        <default>
            <password></password>
            <networks replace="replace">
                <ip>::/0</ip>
            </networks>
            <profile>default</profile>
        </default>
    </users>
</clickhouse>