Databases & Data Persistence
Quizzes
4 items
SQL: Query Fundamentals & Database Concepts
Welcome to the SQL Basics Quiz! Relational databases hold the data behind most modern applications. Whether you're a developer writing queries or a DevOps engineer maintaining a production cluster, ma
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 aggregation pipeline matters for
Elasticsearch: Full-Text Search Engine Fundamentals
- Elasticsearch
- Search
- 20 Questions
- ~5 min
- 23 شباط 2026
- Level: Intermediate
Welcome to the Elasticsearch Basics Quiz! Elasticsearch sits behind a large share of log analysis and real-time search. Whether you are troubleshooting a production crash by digging through Filebeat l
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