Preparing for an Oracle Forms interview can feel challenging because the questions often cover a wide range of topics—from the basics of Oracle Forms architecture to advanced built-ins and integration with PL/SQL. In this article, you will find 50 carefully selected Oracle Forms interview questions with answers, explained in simple yet professional language. These will help you revise important concepts, improve your confidence, and get ready for real-world interview scenarios.
General Oracle Forms Basics Interview Questions
1. What is Oracle Forms?
Oracle Forms is a software tool used to create data entry systems for Oracle databases. It allows developers to design, build, and deploy applications that interact with database objects in a user-friendly interface.
2. What is the architecture of Oracle Forms?
The architecture is three-tier:
- Client (Java applet or browser)
- Middle tier (Forms Runtime + Forms Listener Servlet)
- Database (Oracle Database)
3. What are canvases in Oracle Forms?
A canvas is the surface where form items like text fields, buttons, and checkboxes are placed. Canvases are part of the visual interface and can be content, stacked, tab, or toolbar type.
4. What is a block in Oracle Forms?
A block is a logical container for items. There are two types:
- Data block (linked to database table or view)
- Control block (not associated with a database object)
5. What is the difference between a content canvas and a stacked canvas?
- Content canvas: Occupies the entire window area.
- Stacked canvas: Appears on top of another canvas, used for dialogs or overlays.
Oracle Forms Trigger Interview Questions
6. What is a trigger in Oracle Forms?
A trigger is a PL/SQL code block that runs automatically in response to events such as inserting data, navigating records, or pressing keys.
7. What are the types of triggers in Oracle Forms?
- Key triggers
- Navigational triggers
- Transactional triggers
- Message-handling triggers
- Error-handling triggers
8. What is the difference between PRE-QUERY and POST-QUERY triggers?
- PRE-QUERY: Fires before query execution, allows modifying WHERE clause.
- POST-QUERY: Fires after records are fetched, often used to populate non-database items.
9. When does the WHEN-VALIDATE-ITEM trigger fire?
It fires after the user modifies an item and moves out, ensuring validation before proceeding.
10. What is the use of WHEN-BUTTON-PRESSED trigger?
It executes logic when a button is clicked, commonly used for navigation, data processing, or calling procedures.
Oracle Forms Built-in Packages and Functions Interview Questions
11. What is the difference between GET_ITEM_PROPERTY and GET_BLOCK_PROPERTY?
- GET_ITEM_PROPERTY: Retrieves properties of an item.
- GET_BLOCK_PROPERTY: Retrieves properties of a block.
12. What is the use of SET_ITEM_PROPERTY?
It changes item properties dynamically, such as making an item enabled, visible, or mandatory.
13. What is the use of NAME_IN and COPY built-ins?
- NAME_IN: Reads the value of an item.
- COPY: Writes a value into an item.
14. What is the difference between DELETE_RECORD and REMOVE_RECORD?
- DELETE_RECORD: Marks a record for deletion from the database.
- REMOVE_RECORD: Removes a record from the form’s memory buffer without affecting the database.
15. What is SYNCHRONIZE used for?
It forces the Forms client and server to update the interface immediately, useful when calling external programs or Java beans.
Oracle Forms Navigation and Control Interview Questions
16. What is the difference between CALL_FORM and OPEN_FORM?
- CALL_FORM: Opens another form but suspends the current one until closed.
- OPEN_FORM: Opens another form without suspending the current one.
17. What is NEW_FORM?
It replaces the current form with a new one, closing the existing form.
18. What is EXIT_FORM?
It exits the current form, optionally saving changes based on parameters.
19. What is GO_BLOCK used for?
Moves cursor control to a specified block.
20. What is GO_ITEM used for?
Moves cursor control to a specified item within a block.
Interview Questions on Alerts and Messages in Oracle Forms
21. What is an alert in Oracle Forms?
An alert is a dialog box with buttons (OK, Cancel, Yes, No) that prompts the user for action.
22. What are the types of alerts?
- Stop
- Caution
- Note
23. How do you create a custom alert?
Using the ALERT object in Forms Builder and coding with SHOW_ALERT built-in.
24. What is the difference between MESSAGE and ALERT?
- MESSAGE: Displays a text-only message.
- ALERT: Provides user response options with buttons.
25. How can you display a warning before deleting a record?
By creating a custom alert and calling it in the PRE-DELETE trigger.
Oracle Forms Multi-Record Blocks and LOVs Interview Questions
26. What is a multi-record block?
A block that can display multiple records at once, often used for tabular data.
27. What is a List of Values (LOV)?
A predefined list that helps users pick a value for an item instead of typing manually.
28. How do you attach an LOV to a text item?
By assigning the LOV name to the item’s LOV property and setting RETURN items.
29. What is a Record Group?
A memory structure that holds query results used by LOVs and other features.
30. What is the use of POPULATE_GROUP?
It fills a record group dynamically using SQL queries.
Oracle Forms Libraries and Reusability Interview Questions
31. What is an Object Library (OLB)?
A repository of reusable form objects such as buttons, items, or blocks.
32. What is a PL/SQL library (PLL)?
A library containing reusable PL/SQL procedures and functions that can be attached to multiple forms.
33. What is the difference between OLB and PLL?
- OLB: Contains visual objects.
- PLL: Contains logic/code objects.
34. How do you attach a library to a form?
By using the Attached Libraries option in the form’s property palette.
35. What is the advantage of using libraries?
- Code reusability
- Easier maintenance
- Consistency across forms
Oracle Forms Performance and Debugging Questions
36. How do you improve performance in Oracle Forms?
- Minimize triggers
- Use record groups wisely
- Limit queries with WHERE clauses
- Use POST-QUERY instead of WHEN-NEW-RECORD-INSTANCE for data manipulation
37. What is the use of the DEBUG mode in Forms?
It helps trace execution flow, trigger firing, and SQL queries for debugging purposes.
38. How do you handle errors in Oracle Forms?
Using the ON-ERROR trigger and FORM_FAILURE/FORM_SUCCESS built-ins.
39. What is the difference between FORM_FAILURE and FORM_SUCCESS?
- FORM_FAILURE: Indicates that the last operation failed.
- FORM_SUCCESS: Indicates success of the last operation.
40. What is the use of DBMS_OUTPUT in Oracle Forms?
It is mainly used for debugging PL/SQL procedures called from forms, printing messages in SQL*Plus or IDE consoles.
Interview Questions on Oracle Forms Integration and Advanced Topics
41. How do you call a report from Oracle Forms?
Using RUN_PRODUCT or RUN_REPORT_OBJECT built-ins.
42. What is WEB.SHOW_DOCUMENT used for?
It opens a URL or file in the browser from within a form.
43. How do you print directly from Oracle Forms?
By integrating with Oracle Reports or using HOST and webutil to print client-side.
44. What is WebUtil in Oracle Forms?
A package that allows client-side integration such as file upload/download, clipboard, and printing.
45. How do you upload a file from client to database using Forms?
By using WebUtil’s CLIENT_GET_FILE and DBMS_LOB to store the file in BLOB/CLOB.
Interview Questions on Oracle Forms Security and Administration
46. How do you secure forms at runtime?
- User roles
- Menu restrictions
- Disabling items dynamically
47. What is SET_APPLICATION_PROPERTY used for?
It controls runtime properties such as cursor style, isolation level, and menu access.
48. How do you restrict users from closing a form directly?
By using the ON-CLOSE trigger and handling EXIT_FORM logic.
49. How can you pass parameters from one form to another?
Using GLOBAL variables, PARAMETERS, or the CALL_FORM argument list.
50. What is the difference between a parameter and a global variable in Forms?
- Parameter: Temporary, exists only while calling another form.
- Global variable: Exists until explicitly cleared or form session ends.
Conclusion
Oracle Forms remains an essential tool for enterprise-level applications, especially where organizations rely on Oracle Database for core operations. By preparing with these Oracle Forms interview questions and answers, you can cover both theoretical and practical aspects of the tool. Whether you are a beginner or an experienced developer, mastering these questions will help you perform confidently in interviews.
