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Databases

A Tale of Two Databases, Revisited: DynamoDB and MongoDB 73

Questioning his belief in relational database dogma, new submitter Travis Brown happened to evaluate Amazon's Dynamo DB and MonogDB. His situation was the opposite of Jeff Cogswell's: he started off wanting to prefer Dynamo DB, but came to the conclusion that the benefits of Amazon managing the database for him didn't outweigh the features Mongo offers. From the article: "DynamoDB technically isn't a database, it's a database service. Amazon is responsible for the availability, durability, performance, configuration, optimization and all other manner of minutia that I didn't want occupying my mind. I've never been a big fan of managing the day-to-day operations of a database, so I liked the idea of taking that task off my plate. ... DynamoDB only allows you to query against the primary key, or the primary key and range. There are ways to periodically index your data using a separate service like CloudSearch, but we are quickly losing the initial simplicity of it being a database service. ... However, it turns out MongoDB isn't quite as difficult as the nerds had me believe, at least not at our scale. MongoDB works as advertised and auto-shards and provides a very simple way to get up and running with replica sets." His weblog entry has a few code snippets illustrating how he came to his conclusions.
Security

Zendesk Compromised; Twitter, Tumblr and Pinterest Users Affected 49

Trailrunner7 writes "In the wake of high-profile compromises of companies such as Facebook, the New York Times, Apple and others, officials at Zendesk, an online customer support provider, said that the company also had been compromised and the attackers had made off with the email addresses of customers of Twitter, Tumblr and Pinterest, all of which use Zendesk's services. All three companies sent out emails to affected customers, notifying them of the incident and warning that their email addresses may have been compromised. In what has become an almost daily occurrence now, Zendesk officials posted a notice on the company's blog with the heading "We've been hacked". The Zendesk hack notice says that the company became aware of the attack on its network sometime this week and that the company then identified and patched the vulnerability the attackers had used."
Advertising

CAPTCHA Using Ad-Based Verification 174

mk1004 writes "Yahoo news has an article explaining how the text-based CAPTCHA is giving way to ad-based challenge/response. It's claimed that users are faster at responding to familiar logos, shortening the amount of time they spend proving that they are human. From the article: 'Rather than taking just a mere glance to figure out, recent studies show that a typical CAPTCHA takes, on average, 14 seconds to solve, with some taking much, much longer. Multiply that by the millions and millions of verifications per day, and Web users as a whole are wasting years and years of their lives just trying to prove they're not actually computers. This has led many companies to abandon the age-old system in favor of something not only more secure, but also easier to use for your average Webgoer: Ad-based verification, which can actually cut the time it takes to complete the task in half.'"

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