Databases

Databases

Articles

SQL, NoSQL, PostgreSQL, MySQL, and data management guides.

Articles in this section

MongoDB: A Beginner's Guide to NoSQL Databases Learn MongoDB from scratch. Covers document model, CRUD operations, indexing, aggregation pipeline, and when to choose … 7 min Redis: A Beginner's Guide to Caching and NoSQL Learn Redis — data types, caching strategies, persistence, pub/sub, and using Redis for high-performance data storage. 7 min SQL Query Optimization: Write Faster Queries Learn SQL query optimization — EXPLAIN, indexing strategies, query rewriting, avoiding N+1, and database performance … 8 min Database Backup and Recovery: Strategies for Data Safety Learn database backup strategies — full, incremental, and differential backups, point-in-time recovery, replication, and … 7 min NoSQL Databases: MongoDB, Cassandra, and Redis Explore NoSQL databases — document stores, key-value stores, column-family databases, graph databases, and when to use … 7 min Database Transactions: ACID, Isolation Levels, and Locks Transaction management and concurrency control — ACID properties, isolation levels, locking mechanisms, and MVCC. 8 min SQL JOINs Explained — Inner, Left, Right, Full Outer Master SQL JOINs — INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN, CROSS JOIN, and self-joins with clear examples … 8 min SQL Performance Tuning: Indexes, Queries, and Optimization Slow queries, EXPLAIN plans, indexing strategies, and query optimization techniques for database performance. 8 min Database Replication: Master-Slave, Multi-Master, and Streaming Replication strategies — synchronous vs asynchronous, master-slave, multi-master, and streaming replication. 7 min PostgreSQL vs MySQL — Which Database to Choose A practical comparison of PostgreSQL and MySQL — performance, features, ACID compliance, syntax differences, and which … 8 min Graph Databases: Neo4j and Cypher Query Language Graph data models, relationships, traversal — working with Neo4j and the Cypher query language. 7 min Database Sharding Guide — Horizontal Scaling Strategy Master database sharding — hash-based and range-based sharding, shard keys, rebalancing, consistent hashing, and … 8 min Vector Databases Guide — Embeddings, Search, and RAG Master vector databases — embeddings, approximate nearest neighbor search, HNSW and IVF indexing, and building … 8 min ACID Transactions in Databases: A Complete Guide Learn ACID transactions — Atomicity, Consistency, Isolation, Durability. Understand transaction isolation levels and … 9 min Database Indexing Explained: How Indexes Speed Up Queries Learn how database indexes work, when to use them, and common index types. Practical guide with PostgreSQL examples. 9 min Database Normalization Explained Simply Learn database normalization from 1NF to 3NF with clear examples. Understand when to normalize and when denormalization … 7 min SQL Cheat Sheet: The Most Common Commands A quick-reference SQL cheat sheet covering SELECT, INSERT, UPDATE, DELETE, JOINs, aggregate functions, filtering, and … 9 min SQL Subqueries: A Complete Guide with Examples Learn SQL subqueries — SELECT, FROM, and WHERE subqueries, correlated subqueries, EXISTS, and performance tips with … 8 min