DROP TABLE IF EXISTS hits_none; CREATE TABLE hits_none (Title String CODEC(NONE)) ENGINE = MergeTree ORDER BY tuple() SETTINGS index_granularity = 8192, index_granularity_bytes = '10Mi'; INSERT INTO hits_none SELECT Title FROM test.hits SETTINGS enable_filesystem_cache_on_write_operations=0, max_insert_threads=16; SET min_bytes_to_use_mmap_io = 1; SELECT sum(length(Title)) FROM hits_none; DROP TABLE hits_none;