Category: Database

Master SQL, PostgreSQL, MySQL, MongoDB, and trending open-source databases. Learn optimization, design patterns, and best practices for modern data management.

Oracle Transaction Management & Read Consistency

12 min read · February 15, 2026

Oracle’s transaction management and read consistency mechanisms are fundamental to maintaining data integrity in multi-user environments. Understanding how Oracle handles concurrent transactions,…

Oracle Transaction Management Read Consistency

Oracle ROLLBACK Statement: Behind the Scenes

9 min read · February 15, 2026

When you execute ROLLBACK;, Oracle discards all uncommitted changes and restores data to its previous state. Understanding ROLLBACK is essential for transaction…

Oracle ROLLBACK Statement Execution

Oracle COMMIT Statement: Behind the Scenes

14 min read · February 15, 2026

When you execute COMMIT;, Oracle makes all your DML changes permanent. This seemingly simple statement triggers a complex series of operations involving…

Oracle COMMIT Statement Execution

Oracle DELETE Statement: Behind the Scenes

21 min read · February 15, 2026

When you execute DELETE FROM employees WHERE employee_id = 101;, Oracle performs a complex series of operations involving row location, undo generation,…

Oracle DELETE Statement Execution

Oracle UPDATE Statement: Behind the Scenes

15 min read · February 15, 2026

When you execute UPDATE employees SET salary = 60000 WHERE employee_id = 101;, Oracle performs a sophisticated series of operations involving undo…

Oracle UPDATE Statement Execution

Oracle INSERT Statement: Behind the Scenes

26 min read · February 15, 2026

When you execute a simple INSERT INTO employees VALUES (101, 'John', 'Doe', 50000); statement, Oracle performs a complex series of operations involving…

Oracle INSERT Statement Execution