If you’re preparing for a job involving Oracle Forms development, this article is your ultimate resource. Here, you’ll find the most common oracle forms interview questions along with detailed answers to help you shine during your interview.
Oracle Forms is still widely used in enterprises for developing data-driven applications, so understanding it deeply can give your career a major boost.
Let’s dive into the most important Oracle Forms interview questions you should know!
What is Oracle Forms?
Oracle Forms is a software product for creating screens that interact with an Oracle database. It has been a popular choice for building data-entry systems and applications in many enterprises.
People Also Ask: Oracle Forms Interview Questions and Answers
1. What are Oracle Forms used for?
Oracle Forms are mainly used for creating applications that interact with Oracle databases to perform CRUD operations (Create, Read, Update, Delete).
2. What is the architecture of Oracle Forms?
Oracle Forms uses a three-tier architecture:
- Client (browser)
- Middle tier (Forms server)
- Database server (Oracle Database)
3. What are the components of Oracle Forms?
Key components include:
- Form modules
- Object libraries
- PL/SQL libraries
- Menu modules
4. What is a Trigger in Oracle Forms?
A Trigger is a PL/SQL block executed in response to a specific event (like inserting a record or clicking a button).
5. What are different types of Triggers in Oracle Forms?
Some types are:
- Key triggers
- Navigational triggers
- Transactional triggers
- Message triggers
- Error triggers
6. How do you handle errors in Oracle Forms?
You can use the ON-ERROR and ON-MESSAGE triggers to customize error handling in Oracle Forms.
7. What is a Canvas in Oracle Forms?
A Canvas is a surface inside a window on which visual objects like buttons, text fields, and graphics are placed.
8. What is a Data Block?
A Data Block is a logical grouping of items related to a table or view.
9. What are the different types of canvases?
- Content Canvas
- Stacked Canvas
- Tab Canvas
- Toolbar Canvas
10. What is LOV (List of Values) in Oracle Forms?
LOV provides a pop-up window with a list of values from which the user can select a value for a field.
11. How can you call one form from another in Oracle Forms?
You can use the CALL_FORM, OPEN_FORM, or NEW_FORM built-in procedures.
12. What is the difference between OPEN_FORM, CALL_FORM, and NEW_FORM?
- OPEN_FORM: Opens a new form while keeping the current form active.
- CALL_FORM: Calls a new form but returns to the calling form after completion.
- NEW_FORM: Closes the current form and opens a new one.
13. What is a Parameter List in Oracle Forms?
A Parameter List is used to pass parameters between forms at runtime.
14. What is a Record Group in Oracle Forms?
A Record Group is a query or set of static values used to populate LOVs, data blocks, and more.
15. What is the difference between Property Class and Object Group?
- Property Class: A set of properties you can apply to multiple objects.
- Object Group: A container that holds a group of objects for reusability.
16. What is the role of the Forms Runtime?
Forms Runtime processes user inputs and sends SQL statements to the database, displaying the results.
17. How do you improve performance in Oracle Forms?
Some tips include:
- Using WHERE clauses carefully
- Reducing network traffic
- Using PL/SQL libraries
- Minimizing database calls
18. What is a WHEN-NEW-FORM-INSTANCE Trigger?
This trigger fires when a new form instance is created, typically used for initializing values.
19. What is the difference between PRE-INSERT and POST-INSERT Triggers?
- PRE-INSERT fires before a record is inserted into the database.
- POST-INSERT fires after a successful insert.
20. How do you create a master-detail relationship in Oracle Forms?
By linking two data blocks using primary and foreign keys and setting their relationships in the Data Block Wizard.
21. Can Oracle Forms be integrated with web services?
Yes, Oracle Forms can call web services using Java integration or Oracle WebLogic tools.
22. What is the difference between Static and Dynamic LOVs?
- Static LOVs have hardcoded values.
- Dynamic LOVs fetch values from the database at runtime.
Final Tips to Crack Your Oracle Forms Interview
- Revise your basics around triggers, canvases, LOVs, and data blocks.
- Be ready to answer performance-related questions.
- Practice writing small PL/SQL programs to handle form-level validations.
Understanding these oracle forms interview questions will not only help you answer confidently but also show your in-depth knowledge of Oracle Forms architecture and development.
Good luck with your interview!