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40 lines
3.1 KiB
Markdown
40 lines
3.1 KiB
Markdown
## system.asynchronous_metric_log {#system-tables-async-log}
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Contains the historical values for `system.asynchronous_metrics`, which are saved once per minute. Enabled by default.
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Columns:
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- `event_date` ([Date](../../sql-reference/data-types/date.md)) — Event date.
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- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Event time.
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- `event_time_microseconds` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — Event time with microseconds resolution.
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- `name` ([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_metric_log LIMIT 10
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```
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``` text
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┌─event_date─┬──────────event_time─┬────event_time_microseconds─┬─name─────────────────────────────────────┬─────value─┐
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ CPUFrequencyMHz_0 │ 2120.9 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.arenas.all.pmuzzy │ 743 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.arenas.all.pdirty │ 26288 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.background_thread.run_intervals │ 0 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.background_thread.num_runs │ 0 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.retained │ 60694528 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.mapped │ 303161344 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.resident │ 260931584 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.metadata │ 12079488 │
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│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.allocated │ 133756128 │
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└────────────┴─────────────────────┴────────────────────────────┴──────────────────────────────────────────┴───────────┘
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```
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**See Also**
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- [system.asynchronous_metrics](../system-tables/asynchronous_metrics.md) — Contains metrics, calculated periodically in the background.
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- [system.metric_log](../system-tables/metric_log.md) — Contains history of metrics values from tables `system.metrics` and `system.events`, periodically flushed to disk.
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[Original article](https://clickhouse.com/docs/en/operations/system-tables/asynchronous_metric_log) <!--hide-->
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