ClickHouse/tests/integration/test_system_merges/configs/logs_config.xml

<clickhouse>
    <shutdown_wait_unfinished>3</shutdown_wait_unfinished>
    <logger>
        <level>trace</level>
        <log>/var/log/clickhouse-server/log.log</log>
        <errorlog>/var/log/clickhouse-server/log.err.log</errorlog>
        <size>1000M</size>
        <count>10</count>
        <stderr>/var/log/clickhouse-server/stderr.log</stderr>
        <stdout>/var/log/clickhouse-server/stdout.log</stdout>
    </logger>
    <part_log>
        <database>system</database>
        <table>part_log</table>
        <flush_interval_milliseconds>500</flush_interval_milliseconds>
    </part_log>
</clickhouse>