dashboards
包含通过 HTTP 接口 访问的 /dashboard
页面使用的查询。此表可用于监控和故障排除。该表包含每个仪表盘中每个图表的一行。
注意
/dashboard
页面不仅可以渲染来自 system.dashboards
的查询,还可以渲染来自具有相同模式的任何表的查询。这对于创建自定义仪表盘很有用。
示例
SELECT *
FROM system.dashboards
WHERE title ILIKE '%CPU%'
Row 1:
──────
dashboard: overview
title: CPU Usage (cores)
query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(ProfileEvent_OSCPUVirtualTimeMicroseconds) / 1000000
FROM system.metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32}
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}
Row 2:
──────
dashboard: overview
title: CPU Wait
query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(ProfileEvent_OSCPUWaitMicroseconds) / 1000000
FROM system.metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32}
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}
Row 3:
──────
dashboard: overview
title: OS CPU Usage (Userspace)
query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(value)
FROM system.asynchronous_metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32} AND metric = 'OSUserTimeNormalized'
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}
Row 4:
──────
dashboard: overview
title: OS CPU Usage (Kernel)
query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(value)
FROM system.asynchronous_metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32} AND metric = 'OSSystemTimeNormalized'
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}
列
dashboard
(String
) - 仪表盘名称。title
(String
) - 图表的标题。query
(String
) - 用于获取要显示数据的查询。