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Man Pages


Manual Reference Pages  -  MTBL_INFO (1)

.ds Aq ’

NAME

mtbl_info - display information about an MTBL file

CONTENTS

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.

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& MTBL_INFO (1) 07/17/2015

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