Interview Questions on Oracle Database Architecture

Basic Interview Questions

1. What is Oracle Database Architecture?

  • Follow-up: Can you briefly explain the components involved?

2. What are the main components of the Oracle Database Architecture?

  • Hint: Mention SGA, background processes, data files, control files, etc.

3. What is the System Global Area (SGA)?

  • Follow-up: What are the different parts of SGA?

4. What are background processes in Oracle?

  • Can you name a few important background processes?

5. What is the role of the Process Monitor (PMON) and System Monitor (SMON)?

6. What is a tablespace in Oracle?

  • Follow-up: What is the difference between SYSTEM and SYSAUX tablespaces?

7. What is a control file and why is it important?

8. What are data files and how are they related to tablespaces?

9. What is the difference between a physical and a logical structure in Oracle?

10. What is the role of the redo log files in Oracle?

  • Follow-up: What happens if the redo log is full?

🔹 Intermediate-Level Questions

11. Explain the difference between PGA and SGA.

12. What is an Oracle instance?

  • Follow-up: How is it different from a database?

13. What happens during the Oracle database startup process?

  • Stages: NOMOUNT, MOUNT, OPEN

14. What is the use of the control file during database startup?

15. What is the purpose of the listener in Oracle?

16. What is the difference between a dedicated and shared server architecture in Oracle?

17. What are data dictionary views?

  • Example: USER_TABLES, ALL_TABLES, DBA_TABLES

🔹 Scenario-Based Questions

18. If a user reports slow performance, which components of Oracle architecture would you investigate?

19. How would you check if the Oracle instance is up and running?

20. If the SMON process fails, what impact does it have on the database?

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