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

compact_parts_max_bytes_to_buffer

Only available in ClickHouse Cloud. Maximal number of bytes to write in a single stripe in compact parts

compact_parts_max_granules_to_buffer

Only available in ClickHouse Cloud. Maximal number of granules to write in a single stripe in compact parts

compact_parts_merge_max_bytes_to_prefetch_part

Only available in ClickHouse Cloud. Maximal size of compact part to read it in a whole to memory during merge.
Last modified on July 23, 2026