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Damn Cool Algorithms: Cardinality Estimation
Posted by Nick Johnson | Filed under python , cardinality-estimation , damn-cool-algorithms
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Probabilistic Data Structures For Web Analytics And Data Mining
Statistical analysis and mining of huge multi-terabyte data sets is a common task nowadays, especially in the areas like web analytics and Internet advertising. Analysis of such large data sets oft…
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NoSQL Data Modeling Techniques
NoSQL databases are often compared by various non-functional criteria, such as scalability, performance, and consistency. This aspect of NoSQL is well-studied both in practice and theory because sp…
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EC2 I/O
SentinelOne unifies AI-powered endpoint, cloud, identity, and data protection—enhanced by our Security Data Lake for seamless and efficient cybersecurity.
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Using python and k-means to find dominant colors in images
I'm working on a little photography website for my Dad and thought it would be neat to extract color information from photographs. I tried a couple of different approaches before finding one that works pretty well. This approach uses k-means clustering to cluster the pixels in groups based on their color. The center…
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In-memory key-value store in C, Go and Python
"Coder's paternity leave turns into polyglot key-value store adventure"
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RethinkDB 1.3 is out, now available on OS X
We’ve released RethinkDB 1.3 ( Metropolis ) which has a large number of enhancements, and adds support for OS X and several other platforms. As of the 1.3 release, the server can now be installed on the following platforms:
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PostgreSQL when it is not your job
( Note beforehand: I didn’t get everything. You really also have to look at his slides for the details. Thanks Christophe for posting the slides right afterwards !)
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MapReduce Patterns, Algorithms, and Use Cases
In this article I digested a number of MapReduce patterns and algorithms to give a systematic view of the different techniques that can be found on the web or scientific articles. Several practical…
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Understanding Postgres Performance
Update theres a more recent post that expands further on where to start optimizing specific queries, and of course if you want to dig into optimizing your infrastructure High Performance PostgreSQL is still a great read For many application developers their database is a black box. Data goes in, comes back out and in…
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Relational shell programming
Unix is a bestiary of ad hoc databases: comma-, colon-, tab- and space-separated tables. Think of /etc/* or /var/log/* , or of columnar commands.
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Building a MongoDB Clone in Postgres
I had a crazy thought. Don't all good ideas start with that phrase? Well, this one was suitably crazy: why not build my own version of MongoDB right on top of Postgres? It sounds a little far-fetched, but in all honesty it's pretty simple.
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Lying with pictures: Smartphone manufacturer share by OS
As steer and drplokta pointed out yesterday , the Nielsen diagram was grossly out of proportion, so it looked like RIM and MS were better than they were. I passed the data to steer, who then played around with R (code is in the other post), and produced the second diagram. I've tried to line them…
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