ClickHouse/tests/integration/test_merge_tree_settings_constraints/users.xml

<clickhouse>
    <profiles>
        <default>
            <constraints>
                <merge_tree_min_bytes_for_wide_part>
                    <min>1000</min>
                    <max>100000000</max>
                </merge_tree_min_bytes_for_wide_part>
                <merge_tree_storage_policy>
                    <const/>
                </merge_tree_storage_policy>
            </constraints>
        </default>

        <readonly>
            <readonly>1</readonly>
        </readonly>
    </profiles>

    <users>
        <default>
            <password></password>

            <networks>
                <ip>::/0</ip>
            </networks>

            <profile>default</profile>
        </default>
    </users>
</clickhouse>