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Top Forums UNIX for Dummies Questions & Answers Total file size of a subset list Post 302177560 by matt.d on Friday 21st of March 2008 01:27:18 PM
Old 03-21-2008
1. Not sure why they are using 1023, quite frankly.

2. If you have GB of files, divide x (or tot in my example) by 1073741824

3. %4.2f\n:

% is prefix to a format code
4 means four places to left of decimal
. format number with a decimal
2 means two places to right of decimal
f means end of format code
\n newline
 

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MTBL_INFO(1)															      MTBL_INFO(1)

NAME
mtbl_info - display information about an MTBL file 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" and "zlib". 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, trailer, and data block offset arrays. 05/29/2012 MTBL_INFO(1)
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