Category: Database

Keys, Dates, Time Zones, UUIDs and Schema Design Introduction Traditional Oracle applications were primarily designed for: Single-region deployments On-premise servers Oracle Forms applications Monolithic systems Modern Java applications are different: Cloud deployments Microservices Multi-region users Mobile applications Global customers REST APIs Event-driven architectures As a result, schema design decisions made today directly affect: Scalability Performance Maintainability API design JPA implementation…

A Practical Guide for Java Backend Developers One of the biggest mistakes made during schema design is choosing inappropriate data types. A poor datatype decision can impact: Storage requirements Query performance Index size JPA mappings Application memory usage Future scalability This guide provides: ✅ Complete Oracle datatype reference✅ Minimum and maximum sizes✅ Java mappings✅ When to use each datatype✅ Primary…

Part 1 – Oracle Database Fundamentals, Schema Design and Best Practices Introduction Most Java developers learn Spring Boot, Hibernate, and REST APIs before fully understanding how databases work internally. However, enterprise applications are fundamentally data-driven systems, and Oracle Database remains one of the most widely used databases in banking, insurance, telecom, healthcare, and large enterprise applications. A strong backend developer…

Sets 4–6: Window Functions, Query Optimization, Transactions and Real Interview Problems This article continues the Backend Developer SQL series and focuses on the topics typically asked in 3–10 years experienced backend developer interviews. Topics covered: ✅ Window Functions✅ ROW_NUMBER, RANK, DENSE_RANK✅ Common Table Expressions (CTE)✅ Query Optimization✅ Indexes✅ Execution Plans✅ Transactions✅ Locking✅ Isolation Levels✅ Deadlocks✅ Real SQL Interview Problems Additional…

30 SQL, RDBMS and Database Questions from Beginner to Advanced Level Database knowledge is one of the most important skills for backend developers. Whether you work with Oracle, MySQL, PostgreSQL, SQL Server, or cloud databases, understanding SQL and database concepts is critical. This assessment evaluates: ✅ SQL Fundamentals✅ Joins✅ Group By and Having✅ Primary and Foreign Keys✅ Indexes✅ Normalization✅ Transactions✅…