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News
Bloom Filter: All You Need to Know
1+ hour, 1+ min ago (677+ words) Before diving into it directly, let us first try to understand what problem we faced so this became necessary! We know about the set data structure. A hash-based …...
Why Is Redis So Fast? Understanding the In-Memory Database
2+ hour, 2+ min ago (27+ words) Redis can deliver extremely low-latency reads and writes. Here’s how in-memory storage, persistence, data structures, and its mostly …...
Window Functions in PySpark: A Practical Guide with ROW_NUMBER, RANK, LAG, LEAD, and Running Totals
2+ hour, 27+ min ago (104+ words) Non member readers can read it here for free If you work with Apache Spark, PySpark, Databricks, or SQL, sooner or later you will encounter a problem that looks deceptively simple: “For every customer, find their latest transaction.” “Calculate the…...
Ditch H2: PostgreSQL Repository Tests with Testcontainers and @ServiceConnection in Spring Boot 4
9+ hour, 41+ min ago (204+ words) Your repository tests are green. Then production throws a column “metadata” is of type jsonb but expression is of type character varying…Continue reading on Medium » Ditch H2: PostgreSQL Repository Tests with Testcontainers and @ServiceConnection in Spring Boot 4 Your repository tests…...
Vector Store: How Similarity Becomes Something You Can Actually Search
10+ hour, 18+ min ago (290+ words) A beginner’s guide to how vector stores make embeddings searchable while preserving their connection to the passages and …...
Database Isolation Levels: What Can Concurrent Transactions Actually See?
11+ hour, 53+ min ago (743+ words) Transactions do not execute in isolation from reality. Isolation levels define how much of that reality they are allowed to observe. In the previous topic, we explored Optimistic and Pessimistic Concurrency Control. Now we can go one level deeper. What…...
The SQL Queries That Lie to You With a Straight Face
12+ hour, 26+ min ago (191+ words) Seven queries that run without error, return a result, and are still wrong — and how to stop writing them. Some SQL mistakes throw an error …...
EXPLAIN Describes a Query. Production Is Everything Else That’s Running.
14+ hour, 19+ 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
14+ hour, 16+ 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…
19+ hour, 8+ 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 …...