2020-06-22 08:45:22 +00:00
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---
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machine_translated: true
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machine_translated_rev: 5decc73b5dc60054f19087d3690c4eb99446a6c3
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---
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2020-10-13 17:23:29 +00:00
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# 系统。metric_log {#system_tables-metric_log}
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包含表中度量值的历史记录 `system.metrics` 和 `system.events`，定期刷新到磁盘。
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打开指标历史记录收集 `system.metric_log`,创建 `/etc/clickhouse-server/config.d/metric_log.xml` 具有以下内容:
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``` xml
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<clickhouse>
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2020-06-22 08:45:22 +00:00
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<metric_log>
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<database>system</database>
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<table>metric_log</table>
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<flush_interval_milliseconds>7500</flush_interval_milliseconds>
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<collect_interval_milliseconds>1000</collect_interval_milliseconds>
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</metric_log>
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</clickhouse>
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```
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**示例**
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``` sql
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SELECT * FROM system.metric_log LIMIT 1 FORMAT Vertical;
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```
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``` text
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Row 1:
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──────
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event_date: 2020-02-18
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event_time: 2020-02-18 07:15:33
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milliseconds: 554
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ProfileEvent_Query: 0
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ProfileEvent_SelectQuery: 0
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ProfileEvent_InsertQuery: 0
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ProfileEvent_FileOpen: 0
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ProfileEvent_Seek: 0
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ProfileEvent_ReadBufferFromFileDescriptorRead: 1
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ProfileEvent_ReadBufferFromFileDescriptorReadFailed: 0
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ProfileEvent_ReadBufferFromFileDescriptorReadBytes: 0
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ProfileEvent_WriteBufferFromFileDescriptorWrite: 1
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ProfileEvent_WriteBufferFromFileDescriptorWriteFailed: 0
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ProfileEvent_WriteBufferFromFileDescriptorWriteBytes: 56
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...
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CurrentMetric_Query: 0
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CurrentMetric_Merge: 0
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CurrentMetric_PartMutation: 0
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CurrentMetric_ReplicatedFetch: 0
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CurrentMetric_ReplicatedSend: 0
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CurrentMetric_ReplicatedChecks: 0
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...
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```
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**另请参阅**
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2020-10-13 17:23:29 +00:00
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- [系统。asynchronous_metrics](../../operations/system-tables/asynchronous_metrics.md#system_tables-asynchronous_metrics) — Contains periodically calculated metrics.
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2020-06-22 08:45:22 +00:00
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- [系统。活动](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that occurred.
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- [系统。指标](../../operations/system-tables/metrics.md#system_tables-metrics) — Contains instantly calculated metrics.
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- [监测](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
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