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:

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.

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