database

Real senior Python interview questions from a top outsourcing company in Vietnam — covering data structures, memory management, async concurrency, database optimization, and code quality.

A structured learning path through the internals of modern databases — from storage engines and B-Trees to transactions, indexing, query processing, and distributed systems.

Master advanced SQL features: window functions for rankings and running totals, CTEs for readable query composition, recursive queries for hierarchical data, and essential functions for real-world analytics.

Deep dive into Galera Cluster internals — the wsrep API, write-set replication, certification-based conflict resolution, node states, flow control, quorum mechanics, and SST vs IST recovery.

Learn how Yii2 talks to databases — configure db connections, write migrations, perform CRUD with Active Record, define model relations, build complex queries with Query Builder, and wrap operations in transactions.

Understand MySQL binary log replication from the ground up — how async and semi-sync replication work, what GTIDs are and why they matter, replication lag causes, and the failure modes that led to Galera Cluster.

Master MySQL high availability from replication basics to multi-master Galera clusters, Percona XtraDB Cluster, ProxySQL query routing, backup strategies, and production monitoring with PMM.

Compare three modern TypeScript ORMs side by side: Prisma, TypeORM, and Drizzle. Learn their architectures, query patterns, migration strategies, performance characteristics, and when to use each with practical examples.

A comprehensive guide to data source patterns from Martin Fowler's PoEAA: Active Record for simple domains, Data Mapper for complex domains, Table Data Gateway and Row Data Gateway for explicit data access. Includes code examples in TypeScript and Java.

Add a PostgreSQL database to your Next.js blog using Drizzle ORM. Design schemas for post views, newsletter subscribers, and comments. Run migrations and wire up CRUD helpers and a real-time view counter.