SYNOPSIS

mtbl_info FILE [FILE]...

DESCRIPTION

mtbl_info(1) displays the following information about the MTBL files specified on the command line.

file name --- the name of the MTBL file.

file size --- the total size of the MTBL file, in bytes.

index bytes --- the total number of bytes and proportion of the total file size consumed by the index.

data block bytes --- the total number of bytes and proportion of the total file size consumed by data blocks.

data block size --- the maximum size of an uncompressed data block.

data block count --- the total number of data blocks.

entry count --- the total number of key-value entries.

key bytes --- 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.

value bytes --- 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.

compression algorithm --- the algorithm used to compress data blocks. Possible values are "none", "snappy", "zlib", "lz4", and "lz4hc".

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.