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  Consistency between Redis Cache and SQL Database

Nowadays, Redis has become one of the most popular cache solution in the Internet industry. Although relational database systems (SQL) bring many awesome properties such as ACID, the performance of the database would degrade under high load in order to maintain these properties. In order to fix this problem, many companies & websites have decided to add a cache layer between the application layer (i.e., the backend code which handles the business logic) and the storage layer (i.e., the SQL d...

   REDIS,CACHE,DATABASE     2019-07-07 08:14:16

  Concise bash programming skills

The following are some concise bash programming skills which we may need in our daily programming work. 1. Check status of command execution The usual way: echo abcdee | grep -q abcd   if [ $? -eq 0 ]; then echo "Found" else echo "Not found" fi Concise way: if echo abcdee | grep -q abc; then echo "Found" else echo "Not found" fi Of course you can remove if...else with following code [Sun Nov 04 05:58 AM] [kodango@devops] ~/workspace $ echo abcdee | grep -q ...

   bash, skill,tip     2012-11-06 10:38:42

  How Query Optimizer Works in RDBMS

In a previous post, we discussed how the various relational operators are implemented in relational database systems. If you have read that post, you probably still remember that there are a few alternative implementations for every operator. Thus, how should RDBMS determine which algorithm (or implementation) to use? Obviously, to optimize the performance for any query, RDBMS has to select the correct the algorithm based on the query. It would not be desirable to always use the same algori...

   DATABASE,DATABASE DESIGN,DATABASE OPTIMIZATION     2019-04-20 07:26:32

  Understand GoLang WaitGroup internals and how it works

Background Before getting into the main content, let me give a brief introduction to WaitGroup and its related background knowledge. Here, the focus is on the basic usage of WaitGroup and the fundamental knowledge of system semaphores. For those who are familiar with these, you can skip this section directly. WaitGroup WaitGroup is one of the most common concurrency control techniques in Golang, and its function can be roughly compared to the join() in concurrency control of other languages' mul...

   GOLANG,WAITGROUP,SOURCE CODE     2023-04-26 08:02:01

  â€œBuild something people want” is not enough

Most people take “Build something people want” to mean “Pick a problem to solve and solve it well.” This is not sufficient to build a world changing company.“Why now?” is the question entrepreneurs really need to answer. “Why now” encompasses two important and closely related concepts:Why have previous attempts at this idea failed?What enabling factors have emerged that enable you to succeed today?The world is full of smart people who have the same...

   User requirement,User friendly,Example,People needs     2011-11-16 08:18:45

  proftpd FTP Server setup on Ubuntu

A- The GUI way (for beginners only)For those who are new to linux and don't want to use a FTP server without GUI, or just for those who don't use often their FTP server and wish to set it quickly without a high level of security, there is a GTK GUI for proftpd.Be careful, it's less secure than configuring yourself your server.1- Install proftpd and gproftpd with synaptic or with this command :Code:sudo apt-get install proftpd gproftpd2-Play with the GUI and set up quickly your server.Beware...

   FTP Server,proftpd,Ubuntu,Setup     2011-04-27 11:23:10

  What is pjax and why we should use it?

What is pjax? Now many websites such as Facebook, Twitter support one browsing style which is when you click one link on their sites, the page will not be redirected, instead only the page contents are updated and URL on address bar is changed. This kind of user experience is much better compared to load the whole page with a blink. There is one important component in the above browsing experience, these websites' AJAX refresh support browser history, when refreshing the page, the address on the...

   pjax,AJAX,history     2013-04-23 12:22:37

  Installing Python Packages

Now that you have you system and project environment all setup you probably want to start developing. But you likely don’t want to start writing an entire project fully from scratch, as you dive in you’ll quickly realize theres many tools helping you build projects and sites faster. For example making a request to a website there’s Requests, for handling processing images there’s Python Imaging Library, or for a full framework to help you in building a sit...

   Python,Package,Installation,Library,Unix     2011-11-02 12:57:45

  Why Emacs?

PreludeIf you are a professional writer – i.e., if someone else is getting paid to worry about how your words are formatted and printed – Emacs outshines all other editing software in approximately the same way that the noonday sun does the stars. It is not just bigger and brighter; it simply makes everything else vanish.Neal StephensonIn the Beginning … Was the Command LineI’m an Emacs user and I’m proud of the fact. I know my reasons for using it (and loving i...

   Emacs,Linux,IDE,Editor,Usage     2011-11-21 10:22:05

  List of freely available programming books

Meta-ListsHow to Design Programs: An Introduction to Computing and Programming25 Free Computer Science EbooksFree Tech BooksMindView IncWikibooks: ProgrammingCheat Sheets (Free)CodePlex List of Free E-BooksBook Training - On Video!Sofware Program Managers Network - Free EBooksEBook Share @ linbai.infoFreeBooksClub.NetTheassayer.orgO'Reilly's Open Books ProjectTechBooksForFree.comGalileo Computing (German)Microsoft Press: Free E-BooksGraphics ProgrammingGPU GemsGPU Gems 2 - ch 8,14...

   Free,eBook,Links,Programming,List     2011-11-14 08:03:34

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