DGrady

Query Oracle databases with Python and SQLAlchemy

N.B. SQLAlchemy now incorporates all of this information in its documentation; I’m leaving this post here, but recommend referring to SQLAlchemy instead of these instructions.

Install requirements

1. We’ll assume you already have SQLAlchemy and Pandas installed; these are included by default in many Python distributions.
2. Install the cx_Oracle package in your Python environment, using either pip or conda, for example:

vancluever

Disabling GNOME Tracker and Other Info

GNOME's tracker is a CPU and privacy hog. There's a pretty good case as to why it's neither useful nor necessary here: http://lduros.net/posts/tracker-sucks-thanks-tracker/

After discovering it chowing 2 cores, I decided to go about disabling it.

Directories

onefoursix

#!/usr/bin/python

## *******************************************************************************************
##  impalaQueries.py
##
##  Getting Info on Impala Queries
##
##  Usage: ./impalaQueries.py  
##
## *******************************************************************************************

hadley

If you were to give recommendations to your "little brother/sister" on things that they need to do to become a data scientist, what would those things be?

I think the "Data Science Venn Diagram" (http://drewconway.com/zia/2013/3/26/the-data-science-venn-diagram) is a great place to start. You need three things to be a good data scientist:

• Statistical knowledge
• Programming/hacking skills
• Domain expertise

Statistical knowledge

sayak-sarkar

#!/bin/sh
SHORTCUT="[Desktop Entry]
Name=Sublime Text 3
Comment=Edit text files
Exec=/opt/sublime_text_3/sublime_text
Icon=/opt/sublime_text_3/Icon/128x128/sublime-text.png
Terminal=false
Type=Application
Encoding=UTF-8
Categories=Utility;TextEditor;"

chenzx

网站运维技术与实践
跳转至： 导航、 搜索
目录

    1 服务器监测
    2 产品访问监测
    3 数据采集、传输与过滤
    4 数据分析与报警
    5 测试评估
    6 集群架构规划

v5tech

Ganglia监控Hadoop及Hbase集群性能(安装配置)

1. 在主节点上安装ganglia-webfrontend和ganglia-monitor

sudo apt-get install ganglia-webfrontend ganglia-monitor

在主节点上安装ganglia-webfrontend和ganglia-monitor。在其他监视节点上，只需要安装ganglia-monitor即可

将ganglia的文件链接到apache的默认目录下

JosefJezek

How to use Pelican on GitHub Pages

Author: Josef Jezek

Install on Ubuntu

Installing Python tools

sudo apt-get install python-setuptools

dsparks

doInstall <- TRUE  # Change to FALSE if you don't want packages installed.
toInstall <- c("ggplot2", "reshape2", "RColorBrewer")
if(doInstall){install.packages(toInstall, repos = "http://cran.us.r-project.org")}
lapply(toInstall, library, character.only = TRUE)

# Generate a random matrix
# This can be any type of numeric matrix,
# though we often see heatmaps of square correlation matrices.
nRow <- 9
nCol <- 16

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs