mtbl_info(1) displays the following information about the MTBL files specified on the command line.
filename — the name of the MTBL file.
filesize — the total size of the MTBL file, in bytes.
indexbytes — the total number of bytes and proportion of the total file size consumed by the index.
datablockbytes — the total number of bytes and proportion of the total file size consumed by data
blocks.
datablocksize — the maximum size of an uncompressed data block.
datablockcount — the total number of data blocks.
entrycount — the total number of key-value entries.
keybytes — the total number of bytes that all keys in the file would occupy if stored end-to-end in a
byte array with no delimiters.
valuebytes — the total number of bytes that all values in the file would occupy if stored end-to-end in
a byte array with no delimiters.
compressionalgorithm — the algorithm used to compress data blocks. Possible values are "none", "snappy",
"zlib", "lz4", "lz4hc", and "zstd".
compactness — a rough metric comparing the total number of bytes in the key-value entries with the total
size of the MTBL file. It is calculated as (file size) / (key bytes + value bytes), and thus takes into
account the gains of data block compression and prefix key compression against the overhead of the index,
metadata, and data block offset arrays.
12/11/2016 MTBL_INFO(1)
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