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

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max_number_of_merges_with_ttl_in_pool

When there is more than specified number of merges with TTL entries in pool, do not assign new merge with TTL. This is to leave free threads for regular merges and avoid “Too many parts”

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max_number_of_mutations_for_replica

Limit the number of part mutations per replica to the specified amount. Zero means no limit on the number of mutations per replica (the execution can still be constrained by other settings).
Last modified on July 23, 2026