Quizzes
4 items
SQL: Query Fundamentals & Database Concepts
Welcome to the SQL Basics Quiz! Relational databases are the bedrock of modern applications. Whether you're a developer writing queries or a DevOps engineer maintaining a production cluster, mastering
MongoDB: NoSQL Database Fundamentals
Welcome to the MongoDB Basics Quiz! NoSQL databases changed the way we handle modern web scale data. Understanding the document model, the flexibility of BSON, and the power of the aggregation pipelin
Elasticsearch: Full-Text Search Engine Fundamentals
- Elasticsearch
- Search
- 20 Questions
- ~5 min
- 23 Feb, 2026
- Level: Intermediate
Welcome to the Elasticsearch Basics Quiz! Elasticsearch is the powerhouse behind modern log analysis and real-time search. Whether you are troubleshooting a production crash by digging through Filebea
Database Design & Patterns
Welcome to the Database Design & Patterns Quiz! Test your knowledge on database normalization, indexing, query optimization, ACID properties, sharding, replication, and more. Each question has a hint
Case Studies
1 item
Zero-Downtime PostgreSQL Major-Version Upgrade at Scale
A multi-terabyte PostgreSQL 12 database was reaching end of life, and the business ran around the clock, so the usual answer of "schedule a maintenance window" was off the table. We upgraded it to Pos