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Displaying posts with tag: challenge (reset)
MySQL NDB Cluster Backup/Restore Challenge

Hey, dolphins! Ready to test your NDB backup and restore skills?

Q1: You have a large database which takes 3 hours to back up. Insert/update/delete traffic will run during the backup. How do you run a backup so that none of the inserts/updates/deletes which are executed after the start of the backup are reflected in the backup files?…

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Grand prize winner Sun Student Reviews Contest

Hohoho! Christmas is coming early this year!

Yesterday the final results for the MySQL and GlassFish Sun Student Reviews Contest were published! Guess who the grand prize winner for the general students’ category is? Yes! It’s me! Thank you all and congratulations to others entries! Below the winners’ list:

Grand Prize Winner: Tomas Augusto Muller, Universidade de Santa Cruz do Sul, Brazil (review, project).

Second Prize Winners (alphabetically sorted by the first …

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Powering what you don’t see with Glassfish and Mysql

Have you ever heard about VoiceXML? It’s a W3C standard that allows you to build web pages that are accessed by voice! It can be used for services like travel tickets selling, hotel reservation, bank account information and so on. In this post, I’ll give you a general view of how to make a basic hotel reservation application with VoiceXML and how to run it using Glassfish and MySQL.

First of all, for VoiceXML applications, we need a voice gateway. I used Voxeo, it’s free and provides you with phone numbers that you can call for free using Skype. All you need to do is create a free account in Voxeo and register your application by informing it’s URL. After registering you’ll receive the unique phone number for your application.

I’ll assume you already know the basics of VoiceXML syntax for the rest of this …

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Talking with Neo4j graphs

Hello! In this post, I will be covering all the main details regarding the development of my entry for the Neo4j Challenge.

The main objective of this challenge is to create a Heroku-ready template or demo application using Neo4j. So, I thought to myself: — what kind of application would be nice to show up in this contest?

After many ideas, here it is!

In short, the application is a Stock Exchange symbol lookup using Neo4j and your voice.

Ok! Let me explain what I did.

My main objective was to try to combine all the joy of Ruby programming, with the power and ease of use provided by the awesome Spring Data Neo4j, Spring Framework, and JVM, to this …

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Replication stars

Working with replication, you come across many topologies, some of them sound and established, some of them less so, and some of them still in the realm of the hopeless wishes. I have been working with replication for almost 10 years now, and my wish list grew quite big during this time. In the last 12 months, though, while working at Continuent, some of the topologies that I wanted to work with have moved from the cloud of wishful thinking to the firm land of things that happen. My quest for star replication starts with the most common topology. One master, many slaves.

Fig 1. Master/Slave topology


It looks like a star, with the rays extending from the master to the slaves. This is the basis of most of the replication going on mostly everywhere nowadays, and it has few surprises. Setting aside the …

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Adding visual to your voice

Last year I started to develop a hotel booking application called Voice Hotel. The word Voice was used in the name because the user interface with all features offered by the system is through the voice. It was missing an interface for viewing the reservations made, and the situation of each one (confirmed, canceled, and so on).

This year I decided to study JavaFX language for developing an initial prototype for this interface, where it should at least allows visualizing existing reservations and the new reservations in real time.

Before I start, it was necessary to go back to the Voice Hotel project and make some modifications and improvements in the system architecture, as follows:

  • Added Jersey support to implement RESTful Web Services, offering an interface to communicate and exchange information with JavaFX application.
  • Jersey Spring contribution to use Spring Framework beans through …
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Seven quiet facts

I didn't want to get involved, but Jan caught me in the tell-seven-things-about-you game. The rules:

  • Link your original tagger(s), and list these rules on your blog.
  • Share seven facts about yourself in the post - some random, some weird.
  • Tag seven people at the end of your post by leaving their names and the links to their blogs.
  • Let them know they’ve been tagged by leaving a comment on their blogs and/or Twitter.

Here are the seven facts about me:

  1. Nobody among my parents and siblings speaks any foreign language. On the other hand, my wife speaks four languages, my sisters-in-law at least three each, and my father-in-law speaks seven languages fluently.
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A challenge: partition a character set in MySQL

How good are your SQL and/or general coding skills? I have a specific challenge I'd like your help solving. I am not sure it's possible, but I'd love to be proven wrong.

Showing entries 1 to 8