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No More Full Table Vacuums in PostgreSQL
I just committed a very important patch to PostgreSQL. The short summary for the patch is " Don't vacuum all-frozen pages. " and it follows...
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The latest blog posts to take off on Hacker News. 1,888 posts.
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Data is a Toxic Asset
Thefts of personal information aren’t unusual. Every week, thieves break into networks and steal data about people, often tens of millions at a time. Most of the time it’s information that’s needed to commit fraud, as happened in 2015 to Experian and the IRS. Sometimes it’s stolen for purposes of embarrassment or…
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Playing “Moneyball” on EA FIFA 16
I'm an EA FIFA enthusiast. More than that, I’ve played since 1994. Last year, I was talking with a friend about the game and he asked me if I was playing Career Mode. My first answer was: "That is boring ... I want to play the real game and not play as a manager". From that day, he decided to convince me to play…
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Data Structures in JavaScript
Freelance web developer, lover of JS and all new stuff #reactjs, #redux, #docker #machinelearning... Co-founder and CTO @AppBubbleBD, involved in @AllOverSequins, @recursecenter alumni
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Interactive NBA Shot Charts with R and Shiny
Make your own NBA shot charts. Open-source, interactive dashboard interface to NBA Stats API built with R and Shiny
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Working with the Clinton State Dept Email Dumps in R, Part 1
This isn’t a post about politics. I do have opinions about the now infamous e-mail server (which will no doubt come out here), but when the WSJ folks made it possible to search the Clinton email releases I though it would be fun to get the data into R to show how well the igraph and ggnetwork packages could work…
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R, the master troll of statistical languages (2012)
Warning: what follows is a somewhat technical discussion of my love-hate relationship with the R statistical language, in which I somehow manage to waste 2,400 words talking about a single line of …
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The dark side of big data
Everybody (1, 2, 3) is talking about big data and the chances that are not to be missed. So it would be fatal to miss this opportunity, for instance, by impo...
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Text Mining South Park
pop culture + data science
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Jepsen: RethinkDB 2.2.3 reconfiguration
In the previous Jepsen analysis of RethinkDB , we tested single-document reads, writes, and conditional writes, under network partitions and process pauses. RethinkDB did not exhibit any nonlinearizable histories in those tests. However, testing with more aggressive failure modes, on both 2.1.5 and 2.2.3, has…
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OFFSET is bad for skipping previous rows
OFFSET doesn’t deliver stable results and makes the query slow. Key-set pagination does neither.
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Top Books on Amazon Based on Links in Hacker News Comments
This visualization shows the top 30 books ranked by total number of links to Amazon in Hacker News comments from Oct 2006 to Oct 2015.
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Voynich Manuscript: word vectors and t-SNE visualization of some patterns
Update 17/01: reddit discussion thread. Update 19/01: hacker news thread. The codex The Voynich Manuscript is a hand-written codex written in an unknown system and carbon-dated to the early 15th century (1404–1438). Although the manuscript has been studied by some famous cryptographers of the World War I and II…
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Parsing 10TB of Metadata, 26M Domain Names and 1.4M SSL Certs for $10 on AWS
Last May I was working on hobby project similar to this: https://github.com/zakjan/cert-chain-resolver/. As I found the cert-chain-resolver project a couple of days later I did nothing with the results, but I got some…
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Introduction to PostgreSQL physical storage
I initially wrote this post for myself, I wanted to understand enough about the underlying physical storage to be able to grasp other concepts which can affect your database. This post is probably more aimed to people with similar interests, I will try to keep it accurate but the aim is to make it simpler to…
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A Tale of Twenty-Two Million Citi Bikes: Analyzing the NYC Bike Share System
Analysis and visualization of the New York City bike share system
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A visual exploration of the spatial patterns in endings of German town names
A visual exploration of the spatial patterns in the endings of German town and village names.
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Moving away from HDF5
Cyrille Rossant,
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Jepsen: RethinkDB 2.1.5
In this Jepsen report, we’ll verify RethinkDB’s support for linearizable operations using majority reads and writes, and explore assorted read and write anomalies when consistency levels are relaxed. This work was funded by RethinkDB, and conducted in accordance with the Jepsen ethics policy .
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