Oracle APEX Cloud Developer Professional Advanced Practice Exam: Hard Questions 2025

Your APEX application experiences intermittent performance degradation during peak hours. Analysis shows that workspace parsing schema queries are executing slowly. You've confirmed the database has adequate resources and statistics are current. The application uses multiple parsing schemas across different workspaces, and some schemas contain over 10,000 objects. What is the MOST effective architectural solution to resolve this issue?

You're implementing a multi-tenant APEX application where each tenant's data is isolated in separate schemas, but all tenants share the same APEX application. Users authenticate via SSO, and their tenant assignment is stored in an external identity management system. During session initialization, you need to switch the parsing schema dynamically based on the authenticated user's tenant. Which approach is the MOST secure and maintainable?

You've created a complex Interactive Grid with master-detail relationship using a REST data source. Users report that when they update child records, the changes appear to save but disappear after page refresh. The REST API logs show successful POST requests with 200 responses. The grid's Lost Update Type is set to 'Row Version Column' and you've specified a version column. What is the MOST likely cause of this issue?

Your application uses a complex PL/SQL package that processes financial transactions. The package has autonomous transaction blocks and uses PRAGMA AUTONOMOUS_TRANSACTION. During load testing, you discover that transaction rollbacks initiated by APEX_ERROR handling don't rollback the audit logs written by the autonomous transactions, leading to orphaned audit records. What is the BEST solution to maintain both transactional integrity and comprehensive audit logging?

You're developing a page with multiple Interactive Reports that share filters across regions. Users can select filter criteria in a Filter region at the top, and all Interactive Reports should reflect these filters without storing them in the Interactive Report's user-specific session state. The filters are complex, involving date ranges, multiple select lists, and text searches. Some users have existing saved Interactive Report configurations. What is the MOST appropriate implementation strategy?

During a security audit, you discover that your APEX application is vulnerable to privilege escalation because users can manipulate URL parameters to access pages they shouldn't. You have authorization schemes properly assigned to pages, but the auditor demonstrates bypassing these by modifying session state through URL manipulation. Which combination of security measures provides the MOST comprehensive protection?

Your APEX application processes large XML documents (up to 50MB) uploaded by users. The XML is parsed using XMLTYPE and data is extracted into relational tables using XMLTable(). During peak usage, you encounter 'ORA-06502: PL/SQL: numeric or value error' and occasional 'ORA-04030: out of process memory' errors. The XML structure is consistent and valid. What combination of techniques provides the MOST effective solution?

You need to implement real-time notifications in your APEX application where users receive instant updates when specific database events occur (e.g., order status changes). The solution must scale to 500 concurrent users, support selective notifications (users only see relevant updates), and minimize database load. Which architecture provides the BEST balance of performance, scalability, and real-time capability?

Your workspace contains 50 APEX applications. You need to implement a centralized audit system that tracks all DML operations across all applications, capturing the application ID, page ID, user, timestamp, and changed values, without modifying individual applications. The solution must handle high transaction volumes (10,000+ operations/hour) and minimize impact on application performance. What is the MOST efficient implementation approach?

You're troubleshooting an Interactive Report where users report inconsistent row counts and missing data when applying filters. The report source is a complex query with multiple outer joins, inline views, and analytic functions. When you examine saved user reports, some configurations return different results for the same filter criteria applied on different days, despite no data changes. What is the MOST likely root cause and solution?