2022-08-28 13:53:52 +00:00
|
|
|
---
|
2022-08-28 13:58:27 +00:00
|
|
|
slug: /en/operations/system-tables/metric_log
|
2022-08-28 13:53:52 +00:00
|
|
|
---
|
2022-06-02 10:55:18 +00:00
|
|
|
# metric_log
|
2020-06-18 08:24:31 +00:00
|
|
|
|
|
|
|
|
Contains history of metrics values from tables `system.metrics` and `system.events`, periodically flushed to disk.
|
2020-10-27 07:22:14 +00:00
|
|
|
|
|
|
|
|
Columns:
|
2023-11-27 15:52:25 +00:00
|
|
|
- `hostname` ([LowCardinality(String)](../../sql-reference/data-types/string.md)) — Hostname of the server executing the query.
|
2023-04-19 15:55:29 +00:00
|
|
|
- `event_date` ([Date](../../sql-reference/data-types/date.md)) — Event date.
|
|
|
|
|
- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Event time.
|
|
|
|
|
- `event_time_microseconds` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — Event time with microseconds resolution.
|
2020-10-27 07:22:14 +00:00
|
|
|
|
2020-06-18 08:24:31 +00:00
|
|
|
**Example**
|
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SELECT * FROM system.metric_log LIMIT 1 FORMAT Vertical;
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
``` text
|
|
|
|
|
Row 1:
|
|
|
|
|
──────
|
2023-11-15 02:22:36 +00:00
|
|
|
hostname: clickhouse.eu-central1.internal
|
2020-09-05 23:36:38 +00:00
|
|
|
event_date: 2020-09-05
|
|
|
|
|
event_time: 2020-09-05 16:22:33
|
|
|
|
|
event_time_microseconds: 2020-09-05 16:22:33.196807
|
|
|
|
|
milliseconds: 196
|
|
|
|
|
ProfileEvent_Query: 0
|
|
|
|
|
ProfileEvent_SelectQuery: 0
|
|
|
|
|
ProfileEvent_InsertQuery: 0
|
|
|
|
|
ProfileEvent_FailedQuery: 0
|
|
|
|
|
ProfileEvent_FailedSelectQuery: 0
|
2020-06-18 08:24:31 +00:00
|
|
|
...
|
|
|
|
|
...
|
2020-09-05 23:36:38 +00:00
|
|
|
CurrentMetric_Revision: 54439
|
|
|
|
|
CurrentMetric_VersionInteger: 20009001
|
|
|
|
|
CurrentMetric_RWLockWaitingReaders: 0
|
|
|
|
|
CurrentMetric_RWLockWaitingWriters: 0
|
|
|
|
|
CurrentMetric_RWLockActiveReaders: 0
|
|
|
|
|
CurrentMetric_RWLockActiveWriters: 0
|
|
|
|
|
CurrentMetric_GlobalThread: 74
|
|
|
|
|
CurrentMetric_GlobalThreadActive: 26
|
|
|
|
|
CurrentMetric_LocalThread: 0
|
|
|
|
|
CurrentMetric_LocalThreadActive: 0
|
|
|
|
|
CurrentMetric_DistributedFilesToInsert: 0
|
2020-06-18 08:24:31 +00:00
|
|
|
```
|
|
|
|
|
|
|
|
|
|
**See also**
|
|
|
|
|
|
2023-04-19 15:55:29 +00:00
|
|
|
- [metric_log setting](../../operations/server-configuration-parameters/settings.md#metric_log) — Enabling and disabling the setting.
|
|
|
|
|
- [system.asynchronous_metrics](../../operations/system-tables/asynchronous_metrics.md) — Contains periodically calculated metrics.
|
|
|
|
|
- [system.events](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that occurred.
|
|
|
|
|
- [system.metrics](../../operations/system-tables/metrics.md) — Contains instantly calculated metrics.
|
|
|
|
|
- [Monitoring](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
|
