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

marks_compress_block_size

Size, in uncompressed bytes, of blocks used when writing compressed mark files for new or rewritten data parts. Applies only when compress_marks is enabled. This controls compression framing and buffering; it does not change index granularity.

marks_compression_codec

Compression encoding used by marks, marks are small enough and cached, so the default compression is ZSTD(3).
Last modified on October 4, 2026