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系统。metric_log
包含表中度量值的历史记录 system.metrics
和 system.events
,定期刷新到磁盘。
打开指标历史记录收集 system.metric_log
,创建 /etc/clickhouse-server/config.d/metric_log.xml
具有以下内容:
<yandex>
<metric_log>
<database>system</database>
<table>metric_log</table>
<flush_interval_milliseconds>7500</flush_interval_milliseconds>
<collect_interval_milliseconds>1000</collect_interval_milliseconds>
</metric_log>
</yandex>
示例
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
...
另请参阅
- 系统。asynchronous_metrics — Contains periodically calculated metrics.
- 系统。活动 — Contains a number of events that occurred.
- 系统。指标 — Contains instantly calculated metrics.
- 监测 — Base concepts of ClickHouse monitoring.