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39 lines
3.1 KiB
Markdown
39 lines
3.1 KiB
Markdown
---
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machine_translated: true
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machine_translated_rev: 5decc73b5dc60054f19087d3690c4eb99446a6c3
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---
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## system.asynchronous_metric_log {#system-tables-async-log}
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包含每分钟记录一次的 `system.asynchronous_metrics`历史值. 默认开启.
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列：
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- `event_date` ([Date](../../sql-reference/data-types/date.md)) — 事件日期.
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- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — 事件时间.
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- `event_time_microseconds` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — 事件时间(微秒).
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- `name` ([String](../../sql-reference/data-types/string.md)) — 指标名.
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- `value` ([Float64](../../sql-reference/data-types/float.md)) — 指标值.
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**示例**
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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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**另请参阅**
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- [system.asynchronous_metrics](../../operations/system-tables/asynchronous_metrics.md#system_tables-asynchronous_metrics) — 包含在后台定期计算的指标.
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- [system.metric_log](../../operations/system-tables/metric_log.md#system_tables-metric_log) — 包含定期刷新到磁盘表 `system.metrics` 以及 `system.events` 中的指标值历史记录.
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