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New
The latest blog posts to take off on Hacker News. 1,888 posts.
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Using Python and heat maps to determine the best place to aim on a dart board
Over break I went out with a buddy of mine and played some darts. This got me to thinking, where exactly should someone aim in order t...
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MongoDB, Data Durability and Improvements coming in 1.8
Last weekend I tweeted two links to two tweets by a poor guy who apparently got his MongoDB database into an unrecoverable state during shutdown whilst upgrading to a newer version. That tweet quickly made the rounds, and the next morning I saw myself staring at replies stating that it was all his fault, because he…
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Cassandra vs MongoDB vs CouchDB vs Redis vs Riak comparison
The big Cassandra vs Mongodb vs CouchDB vs Redis, vs Riak vs HBase vs Couchbase (ex-Membase) vs OrientDB vs Aerospike vs Neo4j vs Hypertable vs ElasticSearch vs Accumulo vs VoltDB vs Scalaris vs RethinkDB vs Kyoto Tycoon comparison. While SQL databases are insanely useful tools, their monopoly in the last decades is…
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A table that should exist in all projects with a database
Links to social profiles of Ioannis Cherouvim
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The Best Free and Open Source Data Mining Software
The process of extracting patterns from data is called data mining. It is recognized as an essential tool by modern business since it is ab...
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Peewee, a lightweight python ORM
For the past month or so I've been working on writing my own ORM in Python. The project grew out of a need for a lightweight persistence layer for use in Flask web apps. As I've grown so familiar with the Django ORM over the past year, many of the ideas in Peewee are analagous to the concepts in Django. My goal from…
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The Incredible Power of the Amazon EC2 Cluster GPU Instances
Today Amazon Web Services takes another step on the continuous innovation path by announcing a new Amazon EC2 instance type: The Cluster GPU Instance. Based on the Cluster Compute instance type, the Cluster GPU instance adds two NVIDIA Telsa M2050 GPUs offering GPU-based computational power of over one TeraFLOPS per…
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Using MySQL as a NoSQL - A story for exceeding 750,000 qps on a commodity server
UPDATE: Oracle officially released memcached daemon plugin that talks with InnoDB. I'm glad to see that NoSQL+MySQL has become an official ...
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Redis, from the Ground Up
A deep dive into the data structure server: origins, design decisions, feature set, applications, and more.
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Mysql "Swap Insanity"
Update: Also read A brief update on NUMA and MySQL. The “swap insanity” problem, in brief When running MySQL on a large system (e.g., 64GB RAM and dual quad core CPUs) with a large Inno…
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Most common words unique to 1-star and 5-star App Store reviews
I wrote a script to crawl U.S. App Store customer reviews for the top 100 apps from every category (minus duplicates) and compute the most common words in 1-star and 5-star reviews, excluding words that were also common in 3-star reviews.
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Edward Tufte: Sparklines: theory and practice
A forum moderated by author and artist Edward Tufte, including discussion and questions dealing with information design.
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Scalable ACID
(This post is coauthored by Alexander Thomson and Daniel Abadi ) It is a poorly kept secret that NoSQL is not really about eliminating SQL ...
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A Story of O(racle)
In recent days I’ve been thinking of JavaOne, as we kicked it around and decided we just couldn’t send speakers ; and of Oracle OpenWorld , to which JavaOne will now serve as an appendage. It reminded me of a conversation I had last year about Oracle.
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Racket vs Clojure (it's all about the data structures)
I've been asked by several people to explain why I use Clojure for my professional work rather than Racket. ABOUT RACKET I have been using R...
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A Simple Guide to Five Normal Forms in Relational Database Theory
William Kent, "A Simple Guide to Five Normal Forms in Relational Database Theory", Communications of the ACM 26(2), Feb. 1983, 120-125. Also IBM Technical Report TR03.159, Aug. 1981. Also presented at SHARE 62, March 1984, Anaheim, California. Also in A.R. Hurson, L.L. Miller and S.H. Pakzad, Parallel Architectures…