chungth

# use the following command step by step in terminal 

import pymongo

#get Client 
client = pymongo.MongoClient("localhost", 27017)
#show all mongo document databases
client.database_names()

# choose a database 

ngocphamm

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Scaling Twitter: Making Twitter 10000 Percent Faster
• Scaling Twitter
• Blaine Cook on Scaling Twitter - YouTube

mdesantis

# Schedule script for using Whenever toghether with rbenv
#
#   Whenever: https://github.com/javan/whenever
#   rbenv:    https://github.com/sstephenson/rbenv

set :env_path,    '"$HOME/.rbenv/shims":"$HOME/.rbenv/bin"'

# doesn't need modifications
# job_type :command, ":task :output"

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

cdmwebs

Friendly URLs

By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:

/people/6

But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.

hgmnz

Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

napcs

if has('win32') || has ('win64')
  let $VIMHOME = $HOME."/Dropbox/dotfiles/.vim"

  if !empty($CONEMUBUILD)
    set term=xterm
    set t_Co=256
    let &t_AB="\e[48;5;%dm"
    let &t_AF="\e[38;5;%dm"
  endif