Function rocksdb::properties::compression_ratio_at_level

pub fn compression_ratio_at_level(level: usize) -> PropertyName

“rocksdb.compression-ratio-at-level<N>” - returns string containing the compression ratio of data at level <N>, where <N> is an ASCII representation of a level number (e.g., “0”). Here, compression ratio is defined as uncompressed data size / compressed file size. Returns “-1.0” if no open files at level <N>.