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asynchronous_metric_log.md

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docs/zh/operations/system-tables/asynchronous_metric_log.md
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---
machine_translated: true
machine_translated_rev: 5decc73b5dc60054f19087d3690c4eb99446a6c3
---
## system.asynchronous_metric_log {#system-tables-async-log}
包含每分钟记录一次的 `system.asynchronous_metrics`历史值. 默认开启.
包含每分钟记录一次的 `system.asynchronous_metrics`历史值。默认开启。
列：
- `event_date` ([Date](../../sql-reference/data-types/date.md)) — 事件日期.
- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — 事件时间.
- `event_time_microseconds` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — 事件时间(微秒).
- `name` ([String](../../sql-reference/data-types/string.md)) — 指标名.
- `value` ([Float64](../../sql-reference/data-types/float.md)) — 指标值.
- `event_date` ([Date](../../sql-reference/data-types/date.md)) — 事件日期。
- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — 事件时间。
- `event_time_microseconds` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — 事件时间(微秒)。
- `name` ([String](../../sql-reference/data-types/string.md)) — 指标名。
- `value` ([Float64](../../sql-reference/data-types/float.md)) — 指标值。
**示例**
``` sql