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News
EXPLAIN Describes a Query. Production Is Everything Else That’s Running.
43+ min ago (1398+ words) A while back I wrote about migrating a terabyte of banking data from Oracle to PostgreSQL with no downtime. The part people …...
I Replaced Chroma, Qdrant, and Pinecone With a SQLite File
40+ min ago (165+ words) I needed a vector DB that didn’t require a daemon. SQLite was already there. Every RAG tutorial starts the same way. Step one: install …...
The database connection pool was configured with 50 connections, so why did the 20th request time…
5+ hour, 32+ min ago (30+ words) The database connection pool was configured with 50 connections, so why did the 20th request time out? Understanding how parallel database queries inside a single HTTP request can exhaust your …...
Our users’ phones were the backup: rebuilding a lost database from app caches
6+ hour, 19+ min ago (223+ words) How expired cache entries on readers’ devices, server logs, and a year-old dump were merged back into MongoDB without …...
Vanilla PostgreSQL vs Amazon Aurora PostgreSQL
6+ hour, 54+ min ago (1187+ words) At the application level, Amazon Aurora PostgreSQL looks like PostgreSQL. You connect with PostgreSQL drivers, run SQL, use transactions, indexes, MVCC. Underneath, it is a different database architecture. One sentence explains most of the difference: Vanilla PostgreSQL couples the database engine…...
IEnumerable vs. IQueryable in C#
7+ hour, 22+ min ago (429+ words) This distinction sounds simple stated this way, but it has real, concrete consequences for where computation happens, how much data crosses the network, what C# expressions are even legal to write, and a specific, common class of bug that this…...
Pattern #007: Moving / Rolling Windows in SQL
7+ hour, 17+ min ago (33+ words) How to calculate what happened over the last N days — without confusing it with a running total A product manager asks: “What was our average daily …...
Session 32: Deadlock Handling Strategies
13+ hour, 12+ min ago (758+ words) So now that we know what goes how a deadlock occurs we are now well equiped to think along the lines of Preventing and Handling Deadlocks. Ostrich Algorithm …...
An AI Agent Deleted Our Database in 9 Seconds. The Backup Was 3 Months Old
16+ hour, 20+ min ago (453+ words) # An AI Agent Deleted Our Database in 9 Seconds. The Backup Was 3 Months Old On a Friday afternoon in late April 2026 …...
The Architecture of Systems That Must Remember Everything
16+ hour, 44+ min ago (1310+ words) “” is published by Derek Mwale....