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Databases & Data

The most popular blog posts about databases & data on Hacker News. 1,888 posts.

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574

Guide to Making 3D Maps with Satellite Imagery in R

E ver since I released rayshader to the public, there’s been one question that comes up time and time again: “How do I use rayshader to overlay satellite imagery onto a 3D surface?” And I can see why: 3D maps with real satellite images are super cool, and there are few detailed tutorials out there on how it’s done in…

575

Call me maybe: RabbitMQ

RabbitMQ is a distributed message queue, and is probably the most popular open-source implementation of the AMQP messaging protocol. It supports a wealth of durability, routing, and fanout strategies, and combines excellent documentation with well-designed protocol extensions. I’d like to set all these wonderful…

579

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…

581

PgBouncer is useful, important, and fraught with peril

Updated 2024-09-17 to reflect updated PgBouncer support for protocol-level prepared statements 🐘 To start, I want to say that I’m appreciative that PgBouncer exists and the work its open source maintainers put into it. I also love working with PostgreSQL, and I’m thankful for the incredible amount of work and…

582

Image Completion with Deep Learning in TensorFlow

Content-aware fill is a powerful tool designers and photographers use to fill in unwanted or missing parts of images. Image completion and inpainting are closely related technologies used to fill in missing or corrupted parts of images. There are many ways to do content-aware fill, image completion, and inpainting. In…

584

Why isn't differential dataflow more popular?

Differential dataflow is a library that lets you write simple dataflow programs and a) then runs them in parallel and b) efficiently updates the outputs when new inputs arrive. Compared to competition like spark and kafka streams , it can handle more complex computations and provides dramatically better throughput and…

589

Data centers contain 90% crap data

We need to talk about the data. Crap data. We’re destroying our environment to create and store trillions of blurred images, half-baked videos, rip-off AI ‘songs’, rip-off AI animations, videos and images, emails with mega attachments, never-to-be-watched-again presentations, never-to-be-read-again reports, files and…

590

Replacing Elasticsearch with Rust and SQLite (2017)

Caveat: Elasticsearch is a multi-purpose, distributed, battle-tested, schema-free, log and document storage engine. We’ll be replacing it with a single-purpose, relational schema, me-tested, and custom nginx access log storage engine. Knowing that, let’s begin. Find this project on Github After building my home…

592

Thoughts on Time-series Databases

Preetam "recently" blogged about catena , a time-series metric store. There was another blog post about benchmarking boltdb by a Fog Creek engineer, also looking to write a time series database. This is something of a pattern in the Go community, which already boasts seriesly , InfluxDB , and prometheus ; there are…