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Cargo cult data science
Data science as a cargo cult
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The latest blog posts to take off on Hacker News. 332 posts.
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Practical Guide to SQL Transaction Isolation
You may have seen isolation levels in the documentation for your database, felt mildly uneasy, and went on with life. Few day-to-day examples of using transactions really mention isolation. Most use the database’s default isolation level and hope for the best. It’s a fundamental topic to understand however and you’ll…
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Implementing State Machines in PostgreSQL
Finite-state machine (FSM) is a wonderful model of computation that has many practical applications. One of my favorites is turning business logic into simple FSMs. For example consider the following requirements for an order management system:
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1.1B taxi rides benchmark on the GPU- and PostgreSQL-powered BrytlytDB
Benchmarks & Tips for Big Data, Hadoop, AWS, Google Cloud, PostgreSQL, Spark, Python & More...
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A Comparison of Distributed Machine Learning Platforms
This paper surveys the design approaches used in distributed machine learning (ML) platforms and proposes future research directions. This ...
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Pev: Postgres ‘Explain’ Visualizer (2016)
Postgres Explain Visualizer (Pev) is a tool I wrote to make EXPLAIN output easier to grok. It creates a graphical representation of the query plan.
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What's so hard about histograms?
An interactive essay on the joys and pitfalls of histograms
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ArangoDB 3.2 GA RocksDB, Pregel, Fault-Tolerant Foxx and Satellite Collections
The only enterprise AI data platform that cuts complexity, reduces costs, and gets you to production faster.
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What Does It Take to Track a Million Cell Phones?
You can find anything and everything on the internet, yet nothing that explains how to track cell phones. Let us clarify right away, we are not talking about how to track your own cell phone in cas…
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Announcing RethinkDB 2.3.6: the first release under community governance
We’re pleased to announce the availability of RethinkDB 2.3.6, the first release since RethinkDB transitioned to community governance. This update includes a range of bugfixes and stability improvements. For a complete list of changes in this update, you can refer to the release notes .
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What is Eventual Consistency?
On this post we're going to talk about Eventual Consistency in the context of lock-free and wait-free data structures, with focus on the C++...
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Lessons learned teaching data analysis with Python
A San Diego State journalism professor shares her experience with “First Python Notebook”
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Getting Started with Event Sourcing in Postgres
In a previous post we explored how our application tracks sent emails. We set things up to update or insert a record for each email with the current state (delivered, dropped, etc). In this post we'll look at an alternative data model where we'll store each event as its own record and then roll up t
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Hard Drive Cost per Gigabyte
For hard drive prices, the race to zero is over: nobody won. As you’ll see, the hard drive pricing curve has flattened out.
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Datomic: this is not the history you're looking for
In this post, I'll describe some common pitfalls regarding the use of the 'time-travel' features of Datomic ( db.asOf() , db.history() , :db/txInstant ).
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Postgres Job Queues and Failure by MVCC
How Postgres’ concurrency model coupled with long-lived transactions can degrade the performance of indexes on hot tables in your database.
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There are very few suitable use cases for DynamoDB
Edit: This article is firmly out of date now. I have not gone back to try dynamoDB but I have heard they have changed how throughput is…
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Where machine learning meets rule-based systems
Summary: This post addresses some high-level questions like: Longer term, how much of the verification of Intelligent Autonomous Systems can be done with just Machine Learning (ML)? Should most req…