Added documentation for CurrentMetrics #3010

[alexey-milovidov]

No description provided.

[lfundaro]

Hey guys, I didn't see/understand in this documentation, if one can know what's the time a select query takes. From my clickhouse logs I see how much it takes, but I was wondering if i can get the same in metrics sent to graphite. Thanks !

[alexey-milovidov]

There is no such metric.

Explanation of related metrics:

ProfileEvents.Query
ProfileEvents.SelectQuery
ProfileEvents.InsertQuery

• number of queries started in time interval (for example, one minute, if you export per-minute metrics to Graphite)

Metrics.Query

• number of queries currently executing and the point of time.

We can add a metric about total time spent in queries execution. For example, we already have MergesTimeMilliseconds.

Also in current master version of ClickHouse there are other related metrics:

ClickHouse.ProfileEvents.UserTimeMicroseconds
ClickHouse.ProfileEvents.SystemTimeMicroseconds
ClickHouse.ProfileEvents.RealTimeMicroseconds
ClickHouse.ProfileEvents.OSCPUVirtualTimeMicroseconds

(that may be very similar to what you expect)

PS. For detailed info, I recommend to enable query_log.
https://clickhouse.yandex/docs/en/operations/settings/settings/#log_queries

[lfundaro]

Thank you @alexey-milovidov . Looking forward to see the addition of total time spent in queries execution