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69 lines
2.3 KiB
Markdown
69 lines
2.3 KiB
Markdown
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---
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slug: /en/operations/system-tables/dashboards
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---
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# dashboards
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Contains queries used by `/dashboard` page accessible though [HTTP interface](/docs/en/interfaces/http.md).
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This table can be useful for monitoring and troubleshooting. The table contains a row for every chart in a dashboard.
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:::note
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`/dashboard` page can render queries not only from `system.dashboards`, but from any table with the same schema.
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This can be useful to create custom dashboards.
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:::
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Example:
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``` sql
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SELECT *
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FROM system.dashboards
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WHERE title ILIKE '%CPU%'
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```
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``` text
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Row 1:
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──────
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dashboard: overview
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title: CPU Usage (cores)
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query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(ProfileEvent_OSCPUVirtualTimeMicroseconds) / 1000000
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FROM system.metric_log
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WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32}
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GROUP BY t
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ORDER BY t WITH FILL STEP {rounding:UInt32}
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Row 2:
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──────
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dashboard: overview
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title: CPU Wait
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query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(ProfileEvent_OSCPUWaitMicroseconds) / 1000000
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FROM system.metric_log
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WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32}
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GROUP BY t
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ORDER BY t WITH FILL STEP {rounding:UInt32}
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Row 3:
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──────
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dashboard: overview
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title: OS CPU Usage (Userspace)
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query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(value)
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FROM system.asynchronous_metric_log
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WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32} AND metric = 'OSUserTimeNormalized'
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GROUP BY t
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ORDER BY t WITH FILL STEP {rounding:UInt32}
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Row 4:
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──────
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dashboard: overview
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title: OS CPU Usage (Kernel)
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query: SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(value)
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FROM system.asynchronous_metric_log
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WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32} AND metric = 'OSSystemTimeNormalized'
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GROUP BY t
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ORDER BY t WITH FILL STEP {rounding:UInt32}
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```
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Columns:
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- `dashboard` (`String`) - The dashboard name.
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- `title` (`String`) - The title of a chart.
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- `query` (`String`) - The query to obtain data to be displayed.
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