jcontrol (about oracle) Development Environment Setup Walkthrough - WG: Programmer's Cafe Information This is a walkthrough for setting up a Sakai development environment on a laptop or desktop. These instructions will also work for setting up a development server though I suggest slightly beefier settings for memory. Notes for windows users Icon change the "/" to "\" for all directory paths except those specified in the maven build.properties fileadd the drive letter (C:) to your pathsuse %VARIABLE% instead of $VARIABLE with environment variablesset your environment variables in Control Panel -> System -> Advanced -> Environment Variables All of sakai and related programs should be installed in an opt directory which you will need full write access to, put this directory anywhere you want, this document will assume you have placed it in your root directory
setting up cassandra multi node cluster on a single ubuntu server Install Oracle Java 7 in Ubuntu via PPA Repository We've previously written about installing Oracle JDK 7 in Ubuntu using a script with a GUI provided by Zenity. Some may find this method hard to use and also, it comes with GTK dependencies. So as an alternative that doesn't have any GTK dependencies and comes with automatic updates too, I've set up an Ubuntu PPA for the latest Oracle Java 7 (JDK). The PPA should work not only with Ubuntu but also Linux Mint and other Ubuntu-based Linux distributions. If you really need to use Oracle (ex Sun) Java instead of OpenJDK in Ubuntu, here's an easy way to do it: a PPA repository to install and keep your computer up to date with the latest Oracle Java 7 (Java JDK which includes JRE). Please note that this package is currently in alpha and is offered without any guarantees, so it may or may not work! Update: our Oracle Java 7 installer now supports ARM. Update 2: Oracle Java 8 (stable) was released. Install Oracle Java 7 in Ubuntu or Linux Mint via PPA java -version Removing Oracle Java 7
installation - Where to install programs 4 Reasons Why Data Engineers Don't Use Cassandra - Open Source Three years ago, I was stuck trying to get a use case fit into my Oracle database. It was getting expensive fast and I was running out of budget. A friend suggested I try Apache Cassandra for the task and the time series use case was perfect. It's not a perfect database and it was really hard to get my head around the data model and the driver support was scattered. There were a few points where I was ready to just give up and pay Oracle but I stuck with it. Cassandra was the solution that fit my problem, and after a long uphill climb, it worked better than I'd expected. A few weeks ago, Apache Cassandra passed a significant milestone - It's five years old! Consistency is flakey If you have been working with relational databases for a while, the term “Eventual Consistency” seems just like crazy talk. Reads are slow Cassandra was optimized from the beginning for fast writes. You have to be a master at tuning the JVM Cassandra is written in Java. It’s hard to use as a developer
Java Plugin on Linux See JDK 7 and JRE 7 Installation Guide for general information about installing JDK 7 and JRE 7. When you install the Java platform, the Java plugin file is included as part of that install. If you want to use Java within Firefox, you need to manually create a symbolic link from the plugin file in the release to one of the locations that Firefox expects. To make the plugin available to all users, create the link inside of the Firefox application's directory, in the plugins subdirectory. Alternatively, you can create the symbolic link in your home directory, in ~/.mozilla/plugins. In the remainder of this document, the text, "Firefox plugins directory", implies either of these locations. Note: For Firefox version 21 and higher, you must create the symbolic link in your home directory, ~/.mozilla/plugins. This release provides the Next-Generation Java plugin. The locaton of the plugin file for Linux varies according to the chip architecture of the underlying platform. 1. 2. 3. 4. Notes
Tweeting via Pidgin on Ubuntu Pidgin is a multi-featured instant messaging desktop client that is very popular among Linux users. It supports a wide range of chat networks like Yahoo!, AIM, Google Talk, ICQ, and IRC. You can even send and receive SMS (Text Messages) for free via Pidgin. --Yes it does. For Ubuntu users, here's a simple tutorial on installing this Twitter plugin on Pidgin: 1. deb hardy main deb-src hardy main or deb intrepid main deb-src intrepid main deb jaunty main deb-src jaunty main You can easily add software sources by opening Synaptic Package Manager, and then going to Settings --> Repositories --> Third-Party Software: After adding the above repositories, close the Synaptic Package Manager. 2. Then: sudo apt-get update 3. 4. 5. 6. 7.