How to view memory usage for mutations in ClickHouse?

Question

I'm performing alter table update mutation and want to know how much memory is used by it.

I looked into system.query_log but there are all zeros in read_rows/read_bytes/written_rows/written_bytes/memory_usage. system.mutations also doesn't contain this information.

Is there a way to get it?

Answer 1

system.merges where is_mutation