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asynchronous_metric_log

Contains the historical values for system.asynchronous_metrics, which are saved once per time interval (one second by default). Enabled by default.

Columns:

Example

SELECT * FROM system.asynchronous_metric_log LIMIT 3 \G
Row 1:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-11-14
event_time: 2023-11-14 14:39:07
metric: AsynchronousHeavyMetricsCalculationTimeSpent
value: 0.001

Row 2:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-11-14
event_time: 2023-11-14 14:39:08
metric: AsynchronousHeavyMetricsCalculationTimeSpent
value: 0

Row 3:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-11-14
event_time: 2023-11-14 14:39:09
metric: AsynchronousHeavyMetricsCalculationTimeSpent
value: 0

See Also

  • system.asynchronous_metrics — Contains metrics, calculated periodically in the background.
  • system.metric_log — Contains history of metrics values from tables system.metrics and system.events, periodically flushed to disk.