4d ago · 25 min read · TLDR: Cosmos DB's six API modes are wire-protocol compatibility layers over one shared ARS storage engine — except PostgreSQL (Citus), which is genuinely different. Every API emulates its native database incompletely, and those gaps are structural, n...
Join discussion4d ago · 37 min read · TLDR: NoSQL databases trade cross-entity atomicity for scale — and every database draws that atomicity boundary in a different place. MongoDB's boundary is the document (pre-4.0) or the replica set (4.0+ multi-doc transactions). DynamoDB's boundary i...
Join discussionFeb 12 · 11 min read · Why Traditional Consistency Approaches Fail at Scale Legacy relational databases enforced strong consistency through locking mechanisms and two-phase commit protocols. These approaches work well for single-node systems or tightly coupled clusters, bu...
Join discussionJan 22 · 4 min read · Distributed databases are rarely chosen lightly. When your system handles millions of events per second, every architectural decision echoes across performance, cost, and operational sanity. Apache Cassandra has long been a default choice for large-s...
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Jan 17 · 6 min read · Consistent hashing is a technique in distributed systems that maps data keys and servers to a conceptual "hash ring," minimizing data remapping when nodes are added or removed, ensuring stability and efficient load balancing by only reassigning a fra...
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Jan 16 · 3 min read · Traditional databases like MySQL and PostgreSQL use B-trees as their primary storage structure. B-trees modify data in place on disk, which means updates can happen at many different disk locations. This leads to random disk writes, which are expensi...
Join discussionNov 8, 2025 · 6 min read · Ever wondered how large-scale applications like Twitter, Instagram, or GitHub instantly tell you if a username is taken? It seems simple, but checking for uniqueness across a database with potentially billions of entries in milliseconds is a classic ...
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Oct 29, 2025 · 3 min read · Last updated: 2025-10-29 Website: https://vaachas.com Docs: https://vaachas.com/docs Try it in the browser: https://vaachas.com/dashboard/developer-tools The problem Modern products rarely live in a single datastore. Teams pair Postgres with ...
Join discussionSep 12, 2025 · 4 min read · DevOps engineers absolutely benefit from understanding databases. This article shares the highlights and hands-on learnings from a walkthrough of core database concepts, practical tasks, and real infrastructure decisions that shape real world DevOps ...
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