Top 25 Oracle APEX Interview Question and Answer

1. What is Oracle Application Express (APEX)?

Answer: Oracle APEX is a low-code development platform used for building web applications on the Oracle database.

2. What are the advantages of using Oracle APEX?

Answer: Some advantages include rapid application development, scalability, security, and integration with Oracle Database.

3. How does Oracle APEX handle security?

Answer: Oracle APEX provides various security mechanisms, such as authentication, authorization, session management, and data encryption.

4. What are APEX pages and regions?

Answer: APEX pages are the building blocks of an application, and regions define areas on a page for displaying content.

5. What is a theme in Oracle APEX?

Answer: A theme is a predefined set of templates and styles that determine the look and feel of an APEX application.

6. How can you create a report in Oracle APEX?

Answer: You can create reports using the Report Wizard, SQL queries, or by utilizing the Interactive Grid component.

7. How can you handle validations in Oracle APEX?

Answer: Validations can be implemented using built-in validations, PL/SQL code, or custom JavaScript validation functions.

8. How do you perform data manipulation in Oracle APEX?

Answer: Data manipulation can be done using SQL statements, interactive grids, or through PL/SQL processes.

9. What are shared components in Oracle APEX?

Answer: Shared components are reusable objects like templates, items, and processes that can be used across multiple pages in an application.

10. Explain the concept of master-detail relationship in Oracle APEX.

Answer: A master-detail relationship allows you to link two tables where one table (master) has a primary key that is referenced by another table (detail).

11. How can you schedule jobs in Oracle APEX?

Answer: Jobs can be scheduled using Oracle APEX's built-in Scheduler functionality or by utilizing Oracle Database's Scheduler features.

12. How does Oracle APEX handle internationalization and localization?

Answer: Oracle APEX provides features for translating applications to different languages and supporting localized date, number, and currency formats.

13. What is the difference between an APEX page and a component?

Answer: APEX pages are containers for components. Components are individual elements like buttons, items, reports, and charts.

14. How can you customize the appearance of an APEX application?

Answer: Appearance can be customized using themes, templates, CSS styling, and JavaScript.

15. How do you debug an Oracle APEX application?

Answer: Debugging can be done using debug mode, the Debug Messages window, logging, and using breakpoints in PL/SQL code.

16. How can you secure data in an APEX application?

Answer: Data can be secured by implementing proper authentication, authorization, encryption, and by following secure coding practices.

17. Explain the process of deploying an APEX application.

Answer: APEX applications can be deployed using the built-in export/import feature, by generating installation scripts, or by deploying to Oracle Cloud.

18. What are the different types of APEX collection?

Answer: APEX collections are temporary storage areas used to pass data between pages. They can be in memory, on disk, or based on a table.

19. How can you call PL/SQL code from an APEX application?

Answer: PL/SQL code can be called using processes, computations, validations, or by defining PL/SQL regions on a page.

20. How does Oracle APEX handle version control and team development?

21. What are dynamic actions in Oracle APEX?

Answer: Dynamic actions allow you to define actions that are triggered based on certain events or conditions in an APEX application.

22. How can you implement error handling in Oracle APEX?

Error handling can be done using exception handling in PL/SQL, displaying error messages, and logging errors to the database.

23. What are the different types of APEX items?

Answer: APEX items include text fields, select lists, radio groups, checkboxes, date pickers, and file upload items.

24.How can you import data into an APEX application from external sources?

Answer: Data can be imported using various methods like SQL*Loader, External Tables, CSV files, and RESTful Web Services.

25. How can you integrate Oracle APEX with other systems or applications?