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ClickHouse Queries

Helps to visualize most frequent, slowest, failed queries. Shows queries rate per second, table with last queries

Dashboard based on information from ClickHouse system table system.query_log.
Template variables:

  • type - type of the query, documented in dashboard
  • top elements - number of elements to display; for example: top 5 or top 10
  • initial user - user who initiated query execution
  • query type - select or insert

Charts:

  • Graph Top queries rate - graph shows top executed queries per second
  • Top slow queries - table shows slowest queries
  • Top memory consumers queries - table shows most memory expensive queries
  • Top failed queries - table shows failed queries ordered by count
  • Request charts - two graphs shows queries-per-second rate and query duration
  • Query log table - shows last executed queries

How to install

To enable ClickHouse query logging you will need to add <log_queries>1</log_queries> param into section to your user configuration section. For example:

  <!-- Profiles of settings. -->
    <profiles>
        <!-- Default settings. -->
        <default>
             <log_queries>1</log_queries>

After this, ClickHouse should create table system.query_log.

Important: CH do not log values for insert queries

To query data from ClickHouse use https://grafana.com/plugins/vertamedia-clickhouse-datasource

If you need to show queries from ClickHouse cluster - create distributed table. For example:

CREATE TABLE system.query_log_all AS system.query_log ENGINE = Distributed(<your_cluster_name>, system, query_log);

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