Oracle Certified Professional (OCP) Practice
Exam Newest Exam 2025-2026 With
complete Questions and Correct
Answers|Brand new version.
1. Which SQL statement is used to remove all rows from a table without
removing the table structure?
A. DELETE
B. DROP
C. TRUNCATE
D. REMOVE
TRUNCATE removes all rows quickly without logging individual row deletions
and keeps the table structure intact.
2. What does the COMMIT statement do in Oracle?
A. Rolls back a transaction
B. Ends the session
C. Makes all changes permanent
D. Deletes data
COMMIT permanently saves all changes made during the transaction.
3. Which constraint ensures that a column cannot contain NULL values?
A. UNIQUE
B. NOT NULL
C. CHECK
D. PRIMARY KEY
The NOT NULL constraint enforces that a column must always have a value.
4. Which Oracle process writes modified blocks from the database buffer
cache to data files?
,A. SMON
B. PMON
C. DBWR
D. LGWR
DBWR (Database Writer) writes dirty buffers from memory to disk.
5. Which view shows all objects owned by the current user?
A. DBA_OBJECTS
B. ALL_OBJECTS
C. USER_OBJECTS
D. USER_TABLES
USER_OBJECTS displays all objects that belong to the connected user.
6. Which statement best describes a sequence in Oracle?
A. A constraint that ensures uniqueness
B. A collection of tables
C. An object that generates unique numbers
D. A synonym for indexes
A sequence generates numeric values, typically used for primary keys.
7. What type of join returns all rows from both tables, matching or not?
A. INNER JOIN
B. LEFT JOIN
C. RIGHT JOIN
D. FULL OUTER JOIN
A FULL OUTER JOIN includes all rows from both tables.
8. What is the purpose of the ROLLBACK statement?
A. Save a transaction
B. Undo changes since the last COMMIT
C. End a session
, D. Display log entries
ROLLBACK reverses changes made during the current transaction.
9. Which clause is used to sort query results in ascending or descending
order?
A. GROUP BY
B. HAVING
C. ORDER BY
D. SORT BY
ORDER BY sorts query results based on one or more columns.
10. Which of the following can be indexed in Oracle?
A. Views
B. Tables
C. Synonyms
D. Sequences
Indexes are created on tables to improve query performance.
11. What is the default isolation level in Oracle?
A. READ UNCOMMITTED
B. READ COMMITTED
C. SERIALIZABLE
D. REPEATABLE READ
Oracle’s default isolation level is READ COMMITTED, which prevents dirty
reads.
12. Which command displays the structure of a table?
A. SELECT *
B. DESC
C. SHOW TABLE
D. VIEW TABLE
DESC (DESCRIBE) displays column names, data types, and constraints.
Exam Newest Exam 2025-2026 With
complete Questions and Correct
Answers|Brand new version.
1. Which SQL statement is used to remove all rows from a table without
removing the table structure?
A. DELETE
B. DROP
C. TRUNCATE
D. REMOVE
TRUNCATE removes all rows quickly without logging individual row deletions
and keeps the table structure intact.
2. What does the COMMIT statement do in Oracle?
A. Rolls back a transaction
B. Ends the session
C. Makes all changes permanent
D. Deletes data
COMMIT permanently saves all changes made during the transaction.
3. Which constraint ensures that a column cannot contain NULL values?
A. UNIQUE
B. NOT NULL
C. CHECK
D. PRIMARY KEY
The NOT NULL constraint enforces that a column must always have a value.
4. Which Oracle process writes modified blocks from the database buffer
cache to data files?
,A. SMON
B. PMON
C. DBWR
D. LGWR
DBWR (Database Writer) writes dirty buffers from memory to disk.
5. Which view shows all objects owned by the current user?
A. DBA_OBJECTS
B. ALL_OBJECTS
C. USER_OBJECTS
D. USER_TABLES
USER_OBJECTS displays all objects that belong to the connected user.
6. Which statement best describes a sequence in Oracle?
A. A constraint that ensures uniqueness
B. A collection of tables
C. An object that generates unique numbers
D. A synonym for indexes
A sequence generates numeric values, typically used for primary keys.
7. What type of join returns all rows from both tables, matching or not?
A. INNER JOIN
B. LEFT JOIN
C. RIGHT JOIN
D. FULL OUTER JOIN
A FULL OUTER JOIN includes all rows from both tables.
8. What is the purpose of the ROLLBACK statement?
A. Save a transaction
B. Undo changes since the last COMMIT
C. End a session
, D. Display log entries
ROLLBACK reverses changes made during the current transaction.
9. Which clause is used to sort query results in ascending or descending
order?
A. GROUP BY
B. HAVING
C. ORDER BY
D. SORT BY
ORDER BY sorts query results based on one or more columns.
10. Which of the following can be indexed in Oracle?
A. Views
B. Tables
C. Synonyms
D. Sequences
Indexes are created on tables to improve query performance.
11. What is the default isolation level in Oracle?
A. READ UNCOMMITTED
B. READ COMMITTED
C. SERIALIZABLE
D. REPEATABLE READ
Oracle’s default isolation level is READ COMMITTED, which prevents dirty
reads.
12. Which command displays the structure of a table?
A. SELECT *
B. DESC
C. SHOW TABLE
D. VIEW TABLE
DESC (DESCRIBE) displays column names, data types, and constraints.
