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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
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.metricsиsystem.events.