mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-27 18:12:02 +00:00
43 lines
3.3 KiB
Markdown
43 lines
3.3 KiB
Markdown
---
|
|
slug: /en/operations/system-tables/metrics
|
|
---
|
|
# metrics
|
|
|
|
Contains metrics which can be calculated instantly, or have a current value. For example, the number of simultaneously processed queries or the current replica delay. This table is always up to date.
|
|
|
|
Columns:
|
|
|
|
- `metric` ([String](../../sql-reference/data-types/string.md)) — Metric name.
|
|
- `value` ([Int64](../../sql-reference/data-types/int-uint.md)) — Metric value.
|
|
- `description` ([String](../../sql-reference/data-types/string.md)) — Metric description.
|
|
|
|
The list of supported metrics you can find in the [src/Common/CurrentMetrics.cpp](https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/CurrentMetrics.cpp) source file of ClickHouse.
|
|
|
|
**Example**
|
|
|
|
``` sql
|
|
SELECT * FROM system.metrics LIMIT 10
|
|
```
|
|
|
|
``` text
|
|
┌─metric───────────────────────────────┬─value─┬─description────────────────────────────────────────────────────────────┐
|
|
│ Query │ 1 │ Number of executing queries │
|
|
│ Merge │ 0 │ Number of executing background merges │
|
|
│ PartMutation │ 0 │ Number of mutations (ALTER DELETE/UPDATE) │
|
|
│ ReplicatedFetch │ 0 │ Number of data parts being fetched from replicas │
|
|
│ ReplicatedSend │ 0 │ Number of data parts being sent to replicas │
|
|
│ ReplicatedChecks │ 0 │ Number of data parts checking for consistency │
|
|
│ BackgroundMergesAndMutationsPoolTask │ 0 │ Number of active merges and mutations in an associated background pool │
|
|
│ BackgroundFetchesPoolTask │ 0 │ Number of active fetches in an associated background pool │
|
|
│ BackgroundCommonPoolTask │ 0 │ Number of active tasks in an associated background pool │
|
|
│ BackgroundMovePoolTask │ 0 │ Number of active tasks in BackgroundProcessingPool for moves │
|
|
└──────────────────────────────────────┴───────┴────────────────────────────────────────────────────────────────────────┘
|
|
```
|
|
|
|
**See Also**
|
|
|
|
- [system.asynchronous_metrics](../../operations/system-tables/asynchronous_metrics.md#system_tables-asynchronous_metrics) — Contains periodically calculated metrics.
|
|
- [system.events](../../operations/system-tables/events.md#system_tables-events) — Contains a number of events that occurred.
|
|
- [system.metric_log](../../operations/system-tables/metric_log.md#system_tables-metric_log) — Contains a history of metrics values from tables `system.metrics` and `system.events`.
|
|
- [Monitoring](../../operations/monitoring.md) — Base concepts of ClickHouse monitoring.
|