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ClickHouse/docs/zh/operations/system-tables/asynchronous_metric_log.md
Rory Crispin c9a26d43c5 (docs) Remove async_metric_log event_time_microseconds 
event_time_microseconds was removed from the
system.asynchronous_metric_log in
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slug
/zh/operations/system-tables/asynchronous_metric_log

system.asynchronous_metric_log

包含每分钟记录一次的 system.asynchronous_metrics历史值。默认开启。

列：

  • event_date (Date) — 事件日期。
  • event_time (DateTime) — 事件时间。
  • name (String) — 指标名。
  • value (Float64) — 指标值。

示例

SELECT * FROM system.asynchronous_metric_log LIMIT 10

┌─event_date─┬──────────event_time─┬─name─────────────────────────────────────┬─────value─┐
│ 2020-09-05 │ 2020-09-05 15:56:30 │ CPUFrequencyMHz_0                        │    2120.9 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.arenas.all.pmuzzy               │       743 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.arenas.all.pdirty               │     26288 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.background_thread.run_intervals │         0 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.background_thread.num_runs      │         0 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.retained                        │  60694528 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.mapped                          │ 303161344 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.resident                        │ 260931584 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.metadata                        │  12079488 │
│ 2020-09-05 │ 2020-09-05 15:56:30 │ jemalloc.allocated                       │ 133756128 │
└────────────┴─────────────────────┴──────────────────────────────────────────┴───────────┘

另请参阅