I apologise because I had pasted this question in the newbies forum first (because i am a bit of a newbie) but thought it might be better suited in here
if i have to sepearate parameters can I use this syntax especially the or part (||) and is this correct
if (6 Replies)
I would like to start coding on my mac, but I'm getting an error when I attempt to execute my script
-bash : testscript: command not found
I have verified that the #! line points to the correct directory.
If you have some insight it would be greatly appreciated!
- D (1 Reply)
Hi All,
I am new to pro*C. I have a select statement as
select a.ename,a.sal,a.empno from emp where &n=(select count(distinct(b.sal)) from emp b where a.sal<=b.sal
for this query I have to write a pro*C program. So can you please send me the complete code. Then I will foloow the same... (1 Reply)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I have to write a program in Unix to do the following.Given a phrase like george hates john, by... (0 Replies)
HI,
Can some one guide me how to make changes to the script below so that it can load the history of a program to IT server ?
Format of data:
YYYYMMDD065959.dsk.log
YYYYMMDD235959.dsk.log
currently both are loaded together. Need to separate them as above format.
Thanks in advance.
... (1 Reply)
HI,
Can some one guide me how to make changes to the script below so that it can load the history of a program to IT server ?
Format of data:
YYYYMMDD065959.dsk.log
YYYYMMDD235959.dsk.log
currently both are loaded together. Need to separate them as above format.
Thanks in advance.
... (2 Replies)
My company has an in house instant messaging system (like WhatsApp) where users can communicate with each other. I currently have code to email me certain items from my Sparc machine running SunOS 5.10. I want what I am emailing myself to now instant message me. The team that created the messenger... (5 Replies)
Discussion started by: shorty
5 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)