Oracle Database Foundations Practice Exam 2025: Latest Questions

What is the primary purpose of a database management system (DBMS)?

Which SQL statement would you use to retrieve all columns from a table named EMPLOYEES where the salary is greater than 50000?

In Oracle Database architecture, what is the primary function of the System Global Area (SGA)?

Which data type would be most appropriate for storing a product description that may contain up to 2000 characters?

A database administrator needs to ensure that a column named EMAIL in the CUSTOMERS table cannot contain duplicate values. Which constraint should be applied?

What is the purpose of the WHERE clause in a SQL SELECT statement?

In a relational database, what defines the relationship between a primary key in one table and a foreign key in another table?

Which background process in Oracle Database is responsible for writing modified data blocks from the database buffer cache to the data files?

A developer needs to create a query that returns employees from the EMPLOYEES table along with their department names from the DEPARTMENTS table. Both tables have a common DEPARTMENT_ID column. The result should include all employees, even those without an assigned department. Which type of join should be used?

An organization's database has been experiencing performance issues. Analysis shows that the database buffer cache hit ratio is consistently below 85%. What does this indicate and what action might improve performance?

A database administrator needs to ensure that when a row is deleted from the DEPARTMENTS table, all corresponding rows in the EMPLOYEES table are also automatically deleted. Which type of constraint should be implemented?

Which Oracle Database component is responsible for managing the allocation and deallocation of memory structures?

What is the primary purpose of a database index?

A developer writes the following SQL statement: SELECT employee_id, salary FROM employees WHERE department_id = 50 ORDER BY salary DESC. Which part of this statement determines the sequence in which rows are returned?

In Oracle Database architecture, what is the primary function of the Program Global Area (PGA)?

Which SQL function would you use to convert a null value to a specified replacement value in a query result?

What is the main characteristic that distinguishes a relational database from other types of databases?

A table named PRODUCTS has columns: PRODUCT_ID, PRODUCT_NAME, CATEGORY, and PRICE. A developer needs to find the average price for each category, but only show categories where the average price exceeds 100. Which SQL clause must be used to filter groups based on the aggregate condition?

In Oracle Database, which background process is responsible for writing modified data blocks from the database buffer cache to the data files?

A database designer needs to ensure that a column named EMAIL in the CUSTOMERS table can only contain values that include the '@' symbol. Which type of constraint should be implemented?

A database administrator needs to ensure that when a record is deleted from the DEPARTMENTS table, all corresponding records in the EMPLOYEES table are automatically deleted as well. Which constraint should be used to achieve this behavior?

What is the primary purpose of the System Global Area (SGA) in Oracle Database architecture?

A developer writes the following SQL query: SELECT employee_id, salary FROM employees WHERE department_id = 50 ORDER BY salary DESC FETCH FIRST 3 ROWS ONLY. What is the purpose of this query?

A database contains a table with millions of historical transaction records. Users frequently query this table filtering by transaction_date, but query performance is poor. The DBA notices that full table scans are occurring. What is the MOST effective solution to improve query performance?

An application developer needs to create a view that combines data from the EMPLOYEES and DEPARTMENTS tables, showing employee names along with their department names. However, the view should only include employees from departments located in 'Seattle'. After creating the view, the developer wants to ensure users cannot insert or update data through this view in a way that would violate the location filter. Which option should be added to the CREATE VIEW statement?