ClickHouse/tests/config/config.d/transactions.xml

<yandex>
    <allow_experimental_transactions>42</allow_experimental_transactions>

    <merge_tree>
    </merge_tree>

    <transactions_info_log>
        <database>system</database>
        <table>transactions_info_log</table>
        <flush_interval_milliseconds>7500</flush_interval_milliseconds>
    </transactions_info_log>

    <transaction_log>
        <zookeeper_path>/test/clickhouse/txn</zookeeper_path>

        <fault_probability_before_commit>0.0</fault_probability_before_commit>

        <!-- Fault injection after commit should not affect tests, because default waiting mode is WAIT_UNKNOWN -->
        <fault_probability_after_commit>0.01</fault_probability_after_commit>
    </transaction_log>
</yandex>