1500 Questions | Oracle PL/SQL Developer Professional 2026

Detailed Exam Domain Coverage

To pass the Oracle Database PL/SQL Developer Certified Professional exam on your first attempt, you need a deep, practical understanding of how Oracle handles complex programmatic structures and transaction boundaries. This practice test bank is structured around the five official exam domains, ensuring no blind spots when you sit for the actual test:

• Develop and Implement Data Access Solutions (20%): Mastering the construction of efficient data pipelines. This includes building database triggers and stored procedures, utilizing the FORALL statement for high-performance bulk data manipulation language (DML) operations, and safely modifying database schema objects via the OR REPLACE clause.

• Develop and Implement Data Storage Solutions (20%): Designing robust structures to hold and protect information. Focus areas include optimizing storage using partitioning and data compression, implementing relational constraints and custom database indexes, and leveraging core security features to safeguard data at rest.

• Develop and Implement Complex Business Logic and Reporting Solutions (20%): Transforming raw data into actionable insights through server-side programming. You will be tested on controlling execution flow with FOR and WHILE loops, integrating hierarchical data structures via Oracle XML Database capabilities, and utilizing Oracle OLAP options for multidimensional analysis.

• Implement Database Maintenance, Security, and Troubleshooting Solutions (20%): Keeping the database secure, healthy, and responsive. This covers job scheduling, crafting backup and recovery strategies, configuring user authentication and authorization mechanisms, and systematically diagnosing performance bottlenecks or integrity violations.

• Develop and Implement Scalable and Transactional Solutions (20%): Engineering enterprise-grade architectures that handle heavy concurrent loads. This requires a rock-solid grasp of ACID-compliant transaction properties, locking mechanisms, and the advanced concurrency controls native to the Oracle Database engine.

Course Description

Succeeding in the Oracle Database PL/SQL Developer Certified Professional examination requires more than just memorizing syntax. The actual exam presents complex, real-world development scenarios designed to challenge your architectural judgment and debugging skills. I designed this comprehensive practice test bank of 1,500 original questions to mirror that exact environment, providing the rigorous preparation needed to walk into the testing center with complete confidence.

Every single question in this question bank includes a meticulous breakdown of the underlying mechanics. I do not just tell you which option is right; I dissect why the correct choice is optimal and explain exactly what makes the alternative options fail or introduce performance bottlenecks. By practicing with these targeted scenarios, you will train yourself to recognize common exam traps, understand implicit compiler behaviors, and master the performance tuning patterns that Oracle expects a certified professional to know.

Practice Questions Preview

Here is a look at the style, depth, and analytical rigor of the questions you will encounter inside this course:

Question 1: Data Access Solutions & Bulk DML

An application needs to update 50,000 rows in a table based on an array collection. To optimize performance, a developer implements the FORALL statement. During execution, the 12,000th row violates a check constraint, throwing an unhandled exception. If the SAVE EXCEPTIONS clause was omitted from the statement, what is the state of the database transaction?

• A. All 50,000 rows are successfully updated, ignoring the constraint violation.

• B. The first 11,999 rows remain updated in the session buffer; rows 12,000 through 50,000 are not processed.

• C. The entire transaction is automatically rolled back by the database engine up to the point before the block started.

• D. Rows 1 through 11,999 are committed to the database, while the rest are discarded.

• E. The statement skips the bad row and continues processing rows 12,001 through 50,000.

• F. The database marks the entire table as corrupt and locks the session.

Answer and Explanation

• Correct Answer: B

• Explanation:

  • Why Option B is correct: Without the SAVE EXCEPTIONS clause, a FORALL statement executes as a single bulk operation that halts immediately upon encountering its first unhandled exception. The iterations processed prior to the error (rows 1 to 11,999) remain executed in the current session memory buffer, but processing stops immediately. Rows 12,000 through 50,000 are completely ignored.

  • Why Option A is incorrect: Oracle will never bypass a valid database constraint violation; the exception forces the statement to break.

  • Why Option C is incorrect: Oracle does not perform an automatic statement-level or transaction-level rollback of previous successful iterations within that block unless an explicit ROLLBACK command is issued in an exception handler.

  • Why Option D is incorrect: PL/SQL does not issue implicit commits for bulk operations. The changes are still uncommitted in the session buffer and require an explicit COMMIT.

  • Why Option E is incorrect: Skipping bad rows and continuing execution is only possible if you explicitly use the SAVE EXCEPTIONS clause and loop through the SQL%BULK_EXCEPTIONS collection later.

  • Why Option F is incorrect: Constraint violations are standard runtime exceptions; they never cause physical table corruption or session locks.

Question 2: Concurrency & Transactional Solutions

A developer is configuring an application that requires strict ACID compliance. Session A issues a SELECT ... FOR UPDATE on a specific row but has not yet committed or rolled back. Session B attempts to execute a SELECT statement on the exact same row using the NOWAIT clause. What occurs in Session B?

• A. Session B blocks and waits indefinitely until Session A issues a COMMIT or ROLLBACK.

• B. Session B successfully reads the old, pre-modified data without blocking.

• C. Session B immediately throws an ORA-00054: resource busy exception.

• D. Session B overrides Session A's lock and modifies the data instantly.

• E. Session B reads the uncommitted changes made by Session A (dirty read).

• F. Session B enters a deadlock state, causing the Oracle Database to terminate both sessions.

Answer and Explanation

• Correct Answer: C

• Explanation:

  • Why Option C is correct: The FOR UPDATE clause in Session A places an exclusive row-level lock on the selected data. When Session B attempts to acquire a lock on that same row using SELECT ... FOR UPDATE NOWAIT or any DML requiring a lock, the NOWAIT keyword instructs Oracle not to queue up. Instead, it must instantly raise the ORA-00054 error if the resource is unavailable. (Note: If Session B issued a plain SELECT without a lock request, it would read the data fine, but the scenario implies a conflicting lock request via NOWAIT).

  • Why Option A is incorrect: Session B would only block and wait if the NOWAIT keyword was omitted entirely from its request.

  • Why Option B is incorrect: While standard queries see old data via undo segments, the use of lock modifiers like NOWAIT changes the behavior because it explicitly attempts to acquire a lock that is currently held by Session A.

  • Why Option D is incorrect: Oracle Database strictly enforces row-level locking isolation; a secondary session cannot override or strip an active lock held by another valid transaction.

  • Why Option E is incorrect: Oracle Database does not allow read-uncommitted behaviors ("dirty reads"). Sessions always view data consistent with their statement or transaction start point.

  • Why Option F is incorrect: Deadlocks only happen if both sessions are waiting for resources held by each other in a cyclic dependency. Here, Session B fails immediately, breaking any potential wait loop.

Question 3: Complex Business Logic & Loops

Consider a PL/SQL block containing a cursor FOR LOOP. The cursor retrieves 10,000 rows. The developer declares a variable named v_counter outside the loop to track iterations manually, but also relies on the implicit loop counter index. Which statement accurately describes the memory behavior and scope of this construct?

• A. You must explicitly open, fetch, and close the cursor when using a cursor FOR LOOP.

• B. The loop index variable must be declared in the declarative section of the block before the loop begins.

• C. Oracle implicitly manages the loop index as a record type, and its scope is strictly confined to the loop body.

• D. A cursor FOR LOOP processes rows one by one in memory, causing heavy network round-trips compared to a explicit FETCH.

• E. The variable declared outside the loop will automatically increment along with the loop index.

• F. Attempting to reference the implicit loop index outside the loop boundary causes a runtime crash.

Answer and Explanation

• Correct Answer: C

• Explanation:

  • Why Option C is correct: The loop record or index variable used in a cursor FOR LOOP is implicitly declared by the PL/SQL engine. It matches the structure of the cursor's projection, and its scope exists solely between the LOOP and END LOOP statements.

  • Why Option A is incorrect: The primary benefit of a cursor FOR LOOP is automation; Oracle handles the OPEN, FETCH, and CLOSE operations implicitly behind the scenes.

  • Why Option B is incorrect: Declaring a variable with the same name as the implicit loop index in the block's header creates a separate variable, which is then shadowed (hidden) by the loop's local index scope.

  • Why Option D is incorrect: Modern Oracle PL/SQL optimization automatically pre-fetches rows in batches of 100 under the hood when executing cursor FOR LOOPs, minimizing performance degradation.

  • Why Option E is incorrect: Variables declared outside the loop remain static unless you explicitly write code to increment them inside the loop body (v_counter := v_counter + 1;).

  • Why Option F is incorrect: Referencing the loop index outside the loop boundary results in a compilation error (PLS-00302 or similar identifier error), not a runtime crash.

Welcome to the Mock Exam Practice Tests Academy to help you prepare for your Oracle Database PL/SQL Developer Certified Professional certification.

• You can retake the exams as many times as you want

• This is a huge original question bank

• You get support from instructors if you have questions

• Each question has a detailed explanation

• Mobile-compatible with the Udemy app

I hope that by now you're convinced! And there are a lot more questions inside the course.