Oracle COMMIT Statement: Behind the Scenes
When you execute COMMIT;, Oracle makes all your DML changes permanent. This seemingly simple statement triggers a complex series of operations involving…
Oracle DELETE Statement: Behind the Scenes
When you execute DELETE FROM employees WHERE employee_id = 101;, Oracle performs a complex series of operations involving row location, undo generation,…
Oracle UPDATE Statement: Behind the Scenes
When you execute UPDATE employees SET salary = 60000 WHERE employee_id = 101;, Oracle performs a sophisticated series of operations involving undo…
Oracle INSERT Statement: Behind the Scenes
When you execute a simple INSERT INTO employees VALUES (101, 'John', 'Doe', 50000); statement, Oracle performs a complex series of operations involving…
Oracle SELECT Statement: Behind the Scenes
When you execute a simple SELECT * FROM employees WHERE department_id = 10; query, have you ever wondered what happens behind the…
How to Check TEMP Usage in Oracle Database
Temporary tablespace management is a critical aspect of Oracle Database administration. When TEMP tablespace fills up, it can cause queries to fail,…
Can You Delete a Primary Key in SQL?
Short answer: Yes, absolutely. Surprising answer: Most developers don’t know this is even possible. Here’s the thing—primary keys feel permanent. You set…
5 SQL Primary Key Mistakes That Kill Database Performance (+ Fixes)
You’re building a user registration system. Everything works fine with 100 users. Then you hit 10,000 users and your database grinds to…
Understanding and Resolving ORA-30012: A Comprehensive Guide to UNDO Tablespace Issues
Introduction The ORA-30012 error, which indicates “undo tablespace does not exist or is of wrong type,” is one of the most frequently…
How to Create and Configure ASM Disk Groups on Oracle Exadata Database Machine
Oracle Automatic Storage Management (ASM) serves as the foundational storage management layer for Oracle Exadata environments. By organizing grid disks into logical…
