2020-08-06 08:50:29 +00:00
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# system.metric_log {#system_tables-metric_log}
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2020-06-18 08:24:31 +00:00
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Contains history of metrics values from tables `system.metrics` and `system.events`, periodically flushed to disk.
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2020-10-27 07:22:14 +00:00
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2020-06-18 08:24:31 +00:00
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To turn on metrics history collection on `system.metric_log`, create `/etc/clickhouse-server/config.d/metric_log.xml` with following content:
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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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2020-10-27 07:22:14 +00:00
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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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2020-06-18 08:24:31 +00:00
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**Example**
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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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2020-09-05 23:36:38 +00:00
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event_date: 2020-09-05
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event_time: 2020-09-05 16:22:33
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event_time_microseconds: 2020-09-05 16:22:33.196807
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milliseconds: 196
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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_FailedQuery: 0
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ProfileEvent_FailedSelectQuery: 0
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2020-06-18 08:24:31 +00:00
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...
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...
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2020-09-05 23:36:38 +00:00
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CurrentMetric_Revision: 54439
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CurrentMetric_VersionInteger: 20009001
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CurrentMetric_RWLockWaitingReaders: 0
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CurrentMetric_RWLockWaitingWriters: 0
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CurrentMetric_RWLockActiveReaders: 0
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CurrentMetric_RWLockActiveWriters: 0
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CurrentMetric_GlobalThread: 74
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CurrentMetric_GlobalThreadActive: 26
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CurrentMetric_LocalThread: 0
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CurrentMetric_LocalThreadActive: 0
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CurrentMetric_DistributedFilesToInsert: 0
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2020-06-18 08:24:31 +00:00
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```
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**See also**
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2020-10-13 17:23:29 +00:00
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- [system.asynchronous_metrics](../../operations/system-tables/asynchronous_metrics.md) — Contains periodically calculated metrics.
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2020-07-28 19:38:52 +00:00
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- [system.events](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that occurred.
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2020-07-23 12:15:01 +00:00
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- [system.metrics](../../operations/system-tables/metrics.md) — Contains instantly calculated metrics.
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2020-06-18 08:24:31 +00:00
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- [Monitoring](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
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2020-08-06 08:50:29 +00:00
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[Original article](https://clickhouse.tech/docs/en/operations/system_tables/metric_log) <!--hide-->
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