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These settings are available in system.merge_tree_settings and are autogenerated from ClickHouse source.

zero_copy_concurrent_part_removal_max_postpone_ratio

Max percentage of top level parts to postpone removal in order to get smaller independent ranges. Recommended not to change.

zero_copy_concurrent_part_removal_max_split_times

Max recursion depth for splitting independent Outdated parts ranges into smaller subranges. Recommended not to change.

zero_copy_merge_mutation_min_parts_size_sleep_before_lock

If zero copy replication is enabled sleep random amount of time before trying to lock depending on parts size for merge or mutation

zero_copy_merge_mutation_min_parts_size_sleep_no_scale_before_lock

If zero copy replication is enabled sleep random amount of time up to 500ms before trying to lock for merge or mutation.
Last modified on July 23, 2026