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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

  1. SELECT * FROM system.asynchronous_metrics LIMIT 10
  1. ┌─metric──────────────────────────────────┬──────value─┐
  2. │ jemalloc.background_thread.run_interval │          0 │
  3. │ jemalloc.background_thread.num_runs     │          0 │
  4. │ jemalloc.background_thread.num_threads  │          0 │
  5. │ jemalloc.retained                       │  422551552 │
  6. │ jemalloc.mapped                         │ 1682989056 │
  7. │ jemalloc.resident                       │ 1656446976 │
  8. │ jemalloc.metadata_thp                   │          0 │
  9. │ jemalloc.metadata                       │   10226856 │
  10. │ UncompressedCacheCells                  │          0 │
  11. │ MarkCacheFiles                          │          0 │
  12. └─────────────────────────────────────────┴────────────┘

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.