ClickHouse/docs/zh/operations/system-tables/asynchronous_metrics.md

machine_translated	machine_translated_rev
true	5decc73b5d

系统。asynchronous_metrics

包含在后台定期计算的指标。 例如，在使用的RAM量。

列:

• metric (字符串) — Metric name.
• value (Float64) — Metric value.

示例

SELECT * FROM system.asynchronous_metrics LIMIT 10

┌─metric──────────────────────────────────┬──────value─┐
│ jemalloc.background_thread.run_interval │          0 │
│ jemalloc.background_thread.num_runs     │          0 │
│ jemalloc.background_thread.num_threads  │          0 │
│ jemalloc.retained                       │  422551552 │
│ jemalloc.mapped                         │ 1682989056 │
│ jemalloc.resident                       │ 1656446976 │
│ jemalloc.metadata_thp                   │          0 │
│ jemalloc.metadata                       │   10226856 │
│ UncompressedCacheCells                  │          0 │
│ MarkCacheFiles                          │          0 │
└─────────────────────────────────────────┴────────────┘

另请参阅

• 监测 — Base concepts of ClickHouse monitoring.
• 系统。指标 — Contains instantly calculated metrics.
• 系统。活动 — Contains a number of events that have occurred.
• 系统。metric_log — Contains a history of metrics values from tables system.metrics и system.events.