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ClickHouse/docs/en/operations/system-tables/asynchronous_metrics.md
Anna a6fb067a75
DOCSUP-1915: Split system-table.md into separate files. (#13160) 
* Corrected en files

* Split system-tables.md into separate files

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* Add toc_folder_title and translate

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Co-authored-by: Anna Devyatova <annadevyatova@yandex-team.ru>
Co-authored-by: Sergei Shtykov <bayonet@yandex-team.ru>
Co-authored-by: alexey-milovidov <milovidov@yandex-team.ru>
2020-08-06 11:50:29 +03:00

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system.asynchronous_metrics

Contains metrics that are calculated periodically in the background. For example, the amount of RAM in use.

Columns:

  • metric (String) — Metric name.
  • value (Float64) — Metric value.

Example

SELECT * FROM system.asynchronous_metrics LIMIT 10

┌─metric──────────────────────────────────┬──────value─┐
│ jemalloc.background_thread.run_interval │          0 │
│ jemalloc.background_thread.num_runs     │          0 │
│ jemalloc.background_thread.num_threads  │          0 │
│ jemalloc.retained                       │  422551552 │
│ jemalloc.mapped                         │ 1682989056 │
│ jemalloc.resident                       │ 1656446976 │
│ jemalloc.metadata_thp                   │          0 │
│ jemalloc.metadata                       │   10226856 │
│ UncompressedCacheCells                  │          0 │
│ MarkCacheFiles                          │          0 │
└─────────────────────────────────────────┴────────────┘

See Also

  • Monitoring — Base concepts of ClickHouse monitoring.
  • system.metrics — Contains instantly calculated metrics.
  • system.events — Contains a number of events that have occurred.
  • system.metric_log — Contains a history of metrics values from tables system.metrics и system.events.

Original article