ClickHouse Enable System Tables

ClickHouse monitoring relies on the system tables. You will need to enable some required tables in your cluster using these settings; otherwise, you will receive a missing error message.

Enable system.query_log: https://clickhouse.com/docs/en/operations/server-configuration-parameters/settings#query-log
Enable system.metric_log: https://clickhouse.com/docs/en/operations/server-configuration-parameters/settings#metric_log
Enable system.part_log: https://clickhouse.com/docs/en/operations/server-configuration-parameters/settings#part-log
Enable system.error_log: https://clickhouse.com/docs/en/operations/server-configuration-parameters/settings#error_log

Example settings:

Create /etc/clickhouse-server/config.d/enable_system_log_tables.xml with the following content:

<clickhouse>
  <query_log>
    <database>system</database>
    <table>query_log</table>
    <engine>Engine = MergeTree PARTITION BY event_date ORDER BY event_time TTL event_date + INTERVAL 30 day</engine>
    <flush_interval_milliseconds>7500</flush_interval_milliseconds>
    <max_size_rows>1048576</max_size_rows>
    <reserved_size_rows>8192</reserved_size_rows>
    <buffer_size_rows_flush_threshold>524288</buffer_size_rows_flush_threshold>
    <flush_on_crash>false</flush_on_crash>
  </query_log>
 
  <metric_log>
    <database>system</database>
    <table>metric_log</table>
    <flush_interval_milliseconds>7500</flush_interval_milliseconds>
    <collect_interval_milliseconds>1000</collect_interval_milliseconds>
    <max_size_rows>1048576</max_size_rows>
    <reserved_size_rows>8192</reserved_size_rows>
    <buffer_size_rows_flush_threshold>524288</buffer_size_rows_flush_threshold>
    <flush_on_crash>false</flush_on_crash>
  </metric_log>
 
  <query_metric_log>
    <database>system</database>
    <table>query_metric_log</table>
    <flush_interval_milliseconds>7500</flush_interval_milliseconds>
    <collect_interval_milliseconds>1000</collect_interval_milliseconds>
    <max_size_rows>1048576</max_size_rows>
    <reserved_size_rows>8192</reserved_size_rows>
    <buffer_size_rows_flush_threshold>524288</buffer_size_rows_flush_threshold>
    <flush_on_crash>false</flush_on_crash>
  </query_metric_log>
 
  <part_log>
    <database>system</database>
    <table>part_log</table>
    <partition_by>toMonday(event_date)</partition_by>
    <flush_interval_milliseconds>7500</flush_interval_milliseconds>
    <max_size_rows>1048576</max_size_rows>
    <reserved_size_rows>8192</reserved_size_rows>
    <buffer_size_rows_flush_threshold>524288</buffer_size_rows_flush_threshold>
    <flush_on_crash>false</flush_on_crash>
  </part_log>
 
  <error_log>
    <database>system</database>
    <table>error_log</table>
    <flush_interval_milliseconds>7500</flush_interval_milliseconds>
    <collect_interval_milliseconds>1000</collect_interval_milliseconds>
    <max_size_rows>1048576</max_size_rows>
    <reserved_size_rows>8192</reserved_size_rows>
    <buffer_size_rows_flush_threshold>524288</buffer_size_rows_flush_threshold>
    <flush_on_crash>false</flush_on_crash>
  </error_log>
 
</clickhouse>

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