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system.metric_log

Содержит историю значений метрик из таблиц system.metrics и system.events, периодически сбрасываемую на диск.

Столбцы:

  • event_date (Date) — дата события.
  • event_time (DateTime) — время события.
  • event_time_microseconds (DateTime64) — время события в микросекундах.

Пример

SELECT * FROM system.metric_log LIMIT 1 FORMAT Vertical;
Row 1:
──────
event_date:                                                 2020-02-18
event_time:                                                 2020-02-18 07:15:33
milliseconds:                                               554
ProfileEvent_Query:                                         0
ProfileEvent_SelectQuery:                                   0
ProfileEvent_InsertQuery:                                   0
ProfileEvent_FileOpen:                                      0
ProfileEvent_Seek:                                          0
ProfileEvent_ReadBufferFromFileDescriptorRead:              1
ProfileEvent_ReadBufferFromFileDescriptorReadFailed:        0
ProfileEvent_ReadBufferFromFileDescriptorReadBytes:         0
ProfileEvent_WriteBufferFromFileDescriptorWrite:            1
ProfileEvent_WriteBufferFromFileDescriptorWriteFailed:      0
ProfileEvent_WriteBufferFromFileDescriptorWriteBytes:       56
...
CurrentMetric_Query:                                        0
CurrentMetric_Merge:                                        0
CurrentMetric_PartMutation:                                 0
CurrentMetric_ReplicatedFetch:                              0
CurrentMetric_ReplicatedSend:                               0
CurrentMetric_ReplicatedChecks:                             0
...

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