2020-08-06 08:50:29 +00:00
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# system.metric_log {#system_tables-metric_log}
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Содержит историю значений метрик из таблиц `system.metrics` и `system.events`, периодически сбрасываемую на диск.
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Для включения сбора истории метрик в таблице `system.metric_log` создайте `/etc/clickhouse-server/config.d/metric_log.xml` следующего содержания:
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``` xml
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<yandex>
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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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</yandex>
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```
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**Пример**
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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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**Смотрите также**
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2020-10-13 17:23:29 +00:00
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- [system.asynchronous_metrics](#system_tables-asynchronous_metrics) — таблица с периодически вычисляемыми метриками.
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2020-08-06 08:50:29 +00:00
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- [system.events](#system_tables-events) — таблица с количеством произошедших событий.
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- [system.metrics](#system_tables-metrics) — таблица с мгновенно вычисляемыми метриками.
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- [Мониторинг](../../operations/monitoring.md) — основы мониторинга в ClickHouse.
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[Оригинальная статья](https://clickhouse.tech/docs/ru/operations/system_tables/metric_log) <!--hide-->
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