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Add system.user_processes system table #50422

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KochetovNicolai opened this issue Jun 1, 2023 · 0 comments · Fixed by #50492

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KochetovNicolai commented Jun 1, 2023

Use case

Add table system.user_processes, which will show memory usage and profile counters per user. based on the info stored in ProcessListForUser.

In theory, information can be get from system.processes grouping by user. Motivation for adding a separate table:

Memory usage per user is not a sum of memory usage per query for the user. It may happen when memory is allocated in one scope and deallocated in another (which is usually a bug).
It may be not convenient to sum profile events (it's a map)
Entry for the user is stored even if there are no running queries. Info like peak memory usage may be useful.

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KochetovNicolai added the feature label

antaljanosbenjamin self-assigned this

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Add system.user_processes table #50492

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serxa closed this as completed in #50492

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