Hi
May I know is there a way to read/copy a mainframe (IBM OS/390) dataset (sequential file) into a UNIX directory?
Thank you for your time.
IcyGuava (4 Replies)
Hi,
I have a huge file of bibliographic records in some standard format.I need a script to do some repeatable task as follows:
1. Needs to create folders as the strings starts with "item_*" from the input file
2. Create a file "contents" in each folders having "license.txt(tab... (5 Replies)
Hello All,
I need some assistance to extract a piece of information from a huge file.
The file is like this one :
database information
ccccccccccccccccc
ccccccccccccccccc
ccccccccccccccccc
ccccccccccccccccc
os information
cccccccccccccccccc
cccccccccccccccccc... (2 Replies)
Hello everyone,
i have to normalize this dataset (with 20.000 rows):
2,4,4,3,2,7,8,2,9,11,7,7,1,8,5,6
4,7,5,5,5,5,9,6,4,8,7,9,2,9,7,10
7,10,8,7,4,8,8,5,10,11,2,8,2,5,5,10
4,9,5,7,4,7,7,13,1,7,6,8,3,8,0,8,8
6,7,8,5,4,7,6,3,7,10,7,9,3,8,3,7,8
in this form:... (1 Reply)
I am looking for an opensource dataset library for C. Something equivalent to ADO.Net.
Specifically, I am looking for the following features:
1. Create a Dataset from a file (XML or CSV).
2. Create a Dataset from a select query using an ODBC connection.
3. Load a created Dataset into a... (1 Reply)
Hi All,
I want to write a script to create flar images on multiple servers. In non zfs filesystem I am using -X option to refer a file to exclude mounts on different servers.
but on ZFS -X option is not working. I want multiple mounts to be ignore on ZFS base system during flarecreate.
I... (0 Replies)
Hello. I was wondering if anyone could help. I have a file containing a large table in the format:
marker1 marker2 marker3 marker4
position1 position2 position3 position4
genotype1 genotype2 genotype3 genotype4
with marker being a name, position a numeric... (2 Replies)
I have a huge list of files (about 300,000) which have a pattern like this.
.I 1
.U
87049087
.S
Am J Emerg
.M
Allied Health Personnel/*; Electric Countershock/*;
.T
Refibrillation managed by EMT-Ds:
.P
ARTICLE.
.W
Some patients converted from ventricular fibrillation to organized... (1 Reply)
Hi Guys,
Is there a way to export a sas file i.e .sas7bdat file to .csv file with header and data using unix. I dont want to use SAS program instead using unix tool or unix scripting is it possible ? (25 Replies)
Discussion started by: Master_Mind
25 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)