Some benefits compare to RDBMS (MySQL, Postgres, Oracle …) I come up with after few months using MongoDB and Neo4J.* No model caching thanks to high performance * No join thanks to embedded docs or graph DB * Data-to-object matching is dead simple thanks to no-join and document-oriented * No SQL injection attack * No DB migration thanks to schemaless * Scale horizontally * Social computation made easy with graph DB * No DB roll-up thanks to high volume and cap-collection Q: How do I do data query & tabulation without SQL? A: I do data query via MongoDB indexing & JSON query syntax and do data tabulation via...
You also program in Ruby, right? Three languages! Can you contrast the 3 languages Scala, Clojure and Ruby? That’s a very interesting thing to think about, because Clojure and Ruby have sort of a similar feel in the sense that they are both more dynamically typed than statically typed. Clojure has an interesting relationship with Java, obviously, because it lets you use Java objects, but it doesn’t have type annotations all over the place, like you would have in Java or Scala. I think this general debate of static versus dynamic typing is kind of pointless in some sense, meaning that a lot of times it’s the application that really should dictate what’s best.If you are building something like a typical website that may need a lot of iterations very quickly and there is an informal model of the domain, then maybe it’s not so important to have the formalism of type theory. But, on the other hand, if you are building something that you wanted to behave in a mathematically precise way, then it’s great to have it. They type system of statically language that bakes in the almost provably correct behavior, at the fundamental building blocks. For example, if I’m building a financial application that manages money in some sense, I’d be more likely to want a statically typed language like Scala where I can very precisely specify the behavior of money. Then, build my account objects and so forth on top of that, knowing that they will be robust at this very fundamental level. But, if I’m building a website, where users may be specifying withdrawals...
Zan did a great job of comparing several payment gateways in Singapore. In summary, below are what i found to be important. Available Options in Singapore: Paypal Website Payment Standard Paypal Payflow Gateway E-Nets E-Clearing World Pay Payment Express Cybersource 2c2p Cost Comparison World Pay Enets Paypal Payment express Set up fees S$250 S$200 Free S$150 Annual fees S$650 S$450 Free S$600 Transaction fees 4.50% 4.50% 3.4% + S$0.50 100 free transactions, S$0.50 per transaction thereafter Final Decision? Eventually, we decided to use Paypal Website Payment Standard. Why? First, the cost is the lowest. There are no set up fees or monthly fees. You only pay when there’re purchases. Second, the process is easy to set up. All I needed is a credit card. Applying for a merchant account at the banks is a hassle in comparison. There is processing time, and added charges for the set up can be quite...
About The Neo4j Graph Database Neo4j, the world’s leading graph database, stores data in graphs rather than relational tables. This makes Neo4j especially suitable for applications that handle data with complex relationships, like social networks, life sciences, intelligence and financial applications. Neo4j offers users: extremely high performance on deep traversals and mining of complex data, rapid schema evolution for changing business requirements, and simplified development through perfect match between domain model and database schema. These advantages make Neo4j the most effective database choice by many social networking services and other applications that manage ever more complex business data. via blogs.neotechnology.com * Reading Linked * Exploring Neo4j * Thinking of using Neo4j in one of my current...
Scott: As you mentioned, there is an Apache version of Hadoop and then there’s the Cloudera version. As different companies wrap themselves around different open source projects, they’re structured in different ways. Talk a little bit about Cloudera and what you add to the public open source version of Hadoop, in terms of additional software, support, or services. Amr: I should start by saying that Cloudera is an enterprise software company. Open source is an enabler for us, and it’s part of what we do, but our mission is about building enterprise software for large-scale data processing in internal or external clouds. via...
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