mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 05:32:52 +00:00
40 lines
3.1 KiB
Markdown
40 lines
3.1 KiB
Markdown
## system.asynchronous_metric_log {#system-tables-async-log}
|
|
|
|
Contains the historical values for `system.asynchronous_metrics`, which are saved once per minute. This feature is enabled by default.
|
|
|
|
Columns:
|
|
|
|
- `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.
|
|
- `name` ([String](../../sql-reference/data-types/string.md)) — Metric name.
|
|
- `value` ([Float64](../../sql-reference/data-types/float.md)) — Metric value.
|
|
|
|
**Example**
|
|
|
|
``` sql
|
|
SELECT * FROM system.asynchronous_metric_log LIMIT 10
|
|
```
|
|
|
|
``` text
|
|
┌─event_date─┬──────────event_time─┬────event_time_microseconds─┬─name─────────────────────────────────────┬─────value─┐
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ CPUFrequencyMHz_0 │ 2120.9 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.arenas.all.pmuzzy │ 743 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.arenas.all.pdirty │ 26288 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.background_thread.run_intervals │ 0 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.background_thread.num_runs │ 0 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.retained │ 60694528 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.mapped │ 303161344 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.resident │ 260931584 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.metadata │ 12079488 │
|
|
│ 2020-09-05 │ 2020-09-05 15:56:30 │ 2020-09-05 15:56:30.025227 │ jemalloc.allocated │ 133756128 │
|
|
└────────────┴─────────────────────┴────────────────────────────┴──────────────────────────────────────────┴───────────┘
|
|
```
|
|
|
|
**See Also**
|
|
|
|
- [system.asynchronous_metrics](../system-tables/asynchronous_metrics.md) — Contains metrics that are calculated periodically in the background.
|
|
- [system.metric_log](../system-tables/metric_log.md) — Contains history of metrics values from tables `system.metrics` and `system.events`, periodically flushed to disk.
|
|
|
|
[Original article](https://clickhouse.tech/docs/en/operations/system_tables/asynchronous_metric_log) <!--hide-->
|