Excessive Disk Space - MongoDB
29 days ago by jwh
"You may notice that for a given set of data the MongoDB datafiles in /data/db are larger than the data set inserted into the database. There are several reasons for this."
mongodb
store
db
size
reference
29 days ago by jwh
Pragmatic Programming Techniques: MongoDb Architecture
4 weeks ago by jwh
"When there are multiple indexes available for a collection. When handling a query the first time, MongoDb will create multiple execution plans (one for each available index) and let them take turns (within certain number of ticks) to execute until the fastest plan finishes. The result of the fastest executor will be returned and the system remembers the corresponding index used by the fastest executor. Subsequent query will use the remembered index until certain number of updates has happened in the collection, then the system repeats the process to figure out what is the best index at that time."
architecture
mongodb
reference
queries
design
4 weeks ago by jwh
Inside MongoDB: the Internals of an Open-Source Database
4 weeks ago by jwh
25 slides with some detail
mongodb
reference
detail
slides
4 weeks ago by jwh
Multiagent Systems
8 weeks ago by jwh
Algorithmic, Game-Theoretic, and Logical Foundations-pdf format at top
pdf
multiagent
auction
market
book
reference
books
8 weeks ago by jwh
String metric - Wikipedia, the free encyclopedia
10 weeks ago by jwh
list of string metrics
reference
string
similarity
10 weeks ago by jwh
List of user agents for mobile phones - (wkpedia article)
august 2011 by jwh
"...This page has been deleted."
reference
user-agents
nonreference
august 2011 by jwh
Geologic time scale - (wkpdia article)
august 2011 by jwh
useful clock visualization
reference
time
graphics
august 2011 by jwh
Enterprise Partner Feed Relational
may 2011 by jwh
"Access to both formats requires login credentials and an active partnership with the affiliate program. Partners wishing to apply for access can do so by emailing EPFrequest@apple.com with the primary account holders contact info, proof of being active with the affiliate program and a short description explaining how they intend to use the EPF."
reference
iphone
appstore
feed
affiliate
may 2011 by jwh
Wikimedia Traffic Analysis Report - Operating Systems
november 2010 by jwh
site visitor operating systems
data
reference
os
november 2010 by jwh
Auctions and bidding: A guide for computer scientists ( 2009 .pdf )
june 2010 by jwh
"The main purpose of this paper is to survey this literature from a computer science perspective, primarily from the viewpoint of computer scientists who are interested in learning about auction theory, and to provide pointers into the economics literature for those who want a deeper technical understanding. In addition, since auctions are an increasingly important topic in computer science, we also look at work on auctions from the computer science literature. Overall, our aim is to identifying what both these bodies of work these tell us about creating electronic auctions."
auction
research
university
reference
filetype:pdf
media:document
june 2010 by jwh
Ad Hoc Data Analysis From The Unix Command Line - Wikibooks, collection of open-content textbooks
april 2010 by jwh
"These simple commands can be combined to quickly answer the kinds of questions for which most people would turn to a database, if only the data were already in a database."
analysis
cli
linux
reference
april 2010 by jwh
http://cr.yp.to/daemontools.html
march 2010 by jwh
"daemontools is a collection of tools for managing UNIX services"
reference
daemon
linux
tool
tools
toread
march 2010 by jwh
http://sed.sourceforge.net/sed1line.txt
february 2010 by jwh
some sed one liners
onliner
sed
cli
linux
reference
february 2010 by jwh
File system - (wkpdia article)
january 2010 by jwh
lengthy survey of the concept: "More formally, a file system is a special-purpose database for the storage, organization, manipulation, and retrieval of data."
filesystem
discussion
db
linux
reference
january 2010 by jwh
Flight Delay Information - Air Traffic Control System Command Center
january 2010 by jwh
From FAQ: "Every airport that I select on your Real-time Airport Status page reports the same information. Your site is obviously broken.
While this is technically not a question, we will address it anyway. If the same information is reported for every airport, it means one of two things:
1. There are no delays currently being reported for any airports.
2. There is a Traffic Management Initiative in effect that is affecting flights from all or many airports. For example, conditions at Chicago require a Traffic Management Initiative to control traffic volume. The initiative is implemented placing restrictions on all U.S. domestic flights destined to Chicago. Every airport that you check will then indicate that departures destined to Chicago are being delayed. "
travel
reference
While this is technically not a question, we will address it anyway. If the same information is reported for every airport, it means one of two things:
1. There are no delays currently being reported for any airports.
2. There is a Traffic Management Initiative in effect that is affecting flights from all or many airports. For example, conditions at Chicago require a Traffic Management Initiative to control traffic volume. The initiative is implemented placing restrictions on all U.S. domestic flights destined to Chicago. Every airport that you check will then indicate that departures destined to Chicago are being delayed. "
january 2010 by jwh
Usability Research on Federated Login (Google OAuth & Federated Login Research)
december 2009 by jwh
2008 - "Federated Login has been a 'holy grai' in the identity community for a long time. We have known how to do the technical part for a long time. However the industry has constantly tried, and failed, to find a model that was (1) simple for end users, and (2) had a reasonable trust model between the RP (the relying party, which is the site you want to log into) and the IDP (the identity provider, who will identify you to the RP). Google has been experimenting with different user interface models for federated login using the following design principles:"
interface
ui
research
usability
reference
december 2009 by jwh
Zoneinfo - (wkpdia article)
december 2009 by jwh
"The zoneinfo database, also called the tz database, is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems.[1] It is sometimes referred to as the Olson database after the founding contributor Arthur David Olson.[2] Paul Eggert is editor and maintainer of the tz database."
time
reference
december 2009 by jwh
Gary Johnson's Mutt Page
november 2009 by jwh
some detail on using mutt as email client
reference
linux
email
mutt
november 2009 by jwh
A Sample .bashrc File
november 2009 by jwh
nice sample .bashrc file
reference
cli
configuration
bashrc
bash
linux
november 2009 by jwh
Linux Setting processor affinity for a certain task or process
november 2009 by jwh
"CPU affinity is nothing but a scheduler property that "bonds" a process to a given set of CPUs on the SMP system. The Linux scheduler will honor the given CPU affinity and the process will not run on any other CPUs."
reference
cpu
linux
performance
documentation
november 2009 by jwh
Dr Chip's Vim Page
october 2009 by jwh
obsessive vim guy
reference
programming
linux
tutorial
vim
vi
smile
october 2009 by jwh
Pantz.org Technical Reference Site
september 2009 by jwh
extensive linux reference - use search to navigate
linux
reference
september 2009 by jwh
From Power Up To Bash Prompt
april 2009 by jwh
"...brief description of what happens in a Linux system, from the time that you turn on the power, to the time that you log in and get a bash prompt."
linux
tutorial
reference
april 2009 by jwh
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