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38 lines
2.0 KiB
Markdown
38 lines
2.0 KiB
Markdown
# system.asynchronous_metrics {#system_tables-asynchronous_metrics}
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Contains metrics that are calculated periodically in the background. For example, the amount of RAM in use.
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Columns:
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- `metric` ([String](../../sql-reference/data-types/string.md)) — Metric name.
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- `value` ([Float64](../../sql-reference/data-types/float.md)) — Metric value.
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**Example**
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``` sql
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SELECT * FROM system.asynchronous_metrics LIMIT 10
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```
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``` text
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┌─metric──────────────────────────────────┬──────value─┐
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│ jemalloc.background_thread.run_interval │ 0 │
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│ jemalloc.background_thread.num_runs │ 0 │
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│ jemalloc.background_thread.num_threads │ 0 │
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│ jemalloc.retained │ 422551552 │
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│ jemalloc.mapped │ 1682989056 │
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│ jemalloc.resident │ 1656446976 │
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│ jemalloc.metadata_thp │ 0 │
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│ jemalloc.metadata │ 10226856 │
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│ UncompressedCacheCells │ 0 │
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│ MarkCacheFiles │ 0 │
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└─────────────────────────────────────────┴────────────┘
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```
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**See Also**
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- [Monitoring](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
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- [system.metrics](../../operations/system-tables/metrics.md#system_tables-metrics) — Contains instantly calculated metrics.
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- [system.events](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that have occurred.
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- [system.metric_log](../../operations/system-tables/metric_log.md#system_tables-metric_log) — Contains a history of metrics values from tables `system.metrics` и `system.events`.
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[Original article](https://clickhouse.tech/docs/en/operations/system_tables/asynchronous_metrics) <!--hide--> |