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DevOps & Cloud Infrastructure (193)AI & LLMs (143)Backend & APIs (102)Web Development (90)ERP Systems (77)Security (65)Software Development (58)Career Reflections (29)Cloud (29)AI / Machine Learning (18)Product & SaaS (12)University (1)Hackathons (1)

BackendOctober 202611 min read

Database Replication Explained: Leader-Follower, Sync vs Async

How database replication works: WAL shipping, sync versus async commit trade-offs, failover, split-brain, and when multi-leader or leaderless makes sense.

BackendOctober 20269 min read

Read Replicas Return Stale Data: Handling Replication Lag

Why a read replica shows old rows right after a write, how to measure lag in Postgres, and how to route reads so users always see their own changes.

BackendOctober 202611 min read

SQL vs NoSQL: How to Choose a Database for a New System

How to choose between SQL and NoSQL for a new system: the four NoSQL families, modelling from access patterns, and when Postgres JSONB is enough.

BackendOctober 20269 min read

CAP Theorem Explained: How It Shapes Your Database Choice

What the CAP theorem really says, why partitions force a choice, how PACELC adds latency, and how PostgreSQL, MongoDB and Redis behave under it.

BackendOctober 202610 min read

Consistent Hashing Explained: Hash Ring and Virtual Nodes

What consistent hashing is, why caches and databases use it, and the arithmetic showing how many keys move when a node is added, with a runnable TypeScript hash ring.

CloudOctober 20269 min read

Horizontal vs Vertical Scaling: Which to Pick First

Scale up first, scale out when you need redundancy. How statelessness, session handling, the database and cost shape decide between horizontal and vertical scaling.

Showing 175–180 of 818 posts

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