Oracle Interview Questions and Answers

Oracle Interview Questions and Answers

1. What is considered to be the easiest way to create an Oracle database?

1. Using the Oracle Database Configuration Assistant
2. Using the Oracle-supplied database creation procedures
3. Using the SQL CREATE DATABASE 
4. None of the above is correct

Ans: a

2. What does DCL stand for?

1. Data Console Language 
2. Data Control Language
3. Data Control Level 
4. Data Console Level

Ans: b

3. Which keyword is used with DCL statements?

1. DELETE 
2. INSERT
3. SELECT
4. GRANT

Ans: d

4. A transaction that completes its execution is__________

1. Aborted
2. Committed 
3. Rolled back
4. Failed

Ans: b

5. Which Oracle backup and recover file contains both user and system data?

1. Control file
2. Datafile
3. OnLine ReDo file
4. Offline ReDo file

Ans: b

6. Oracle commands, column names, table names, and other database elements are case insensitive when using SQL*Plus.

1. True  
2. False 

Ans: a

7. Which SQL command allows controlling access to data that are within a database?

1. Data control
2. Database
3. Both a and b
4. None of the above

Ans: a

8. Oracle does not support this SQL phrase _________________

1. CREATE SEQUENCE [SequenceName] 
2. DROP SEQUENCE [SequenceName]
3. ON DELETE CASCADE
4. ON UPDATE CASCADE

Ans: d

9. In this type of Oracle backup, all uncommitted changes are removed from the datafiles?

1. Full backup
2. Differential backup
3. Consistent backup
4. Inconsistent backup

Ans: c

10. What is the default extension for an Oracle SQL*Plus file?

1. .sql.
2. .txt.
3. .pls.
4. .or   

Ans: a

11. What is an Oracle System Change Number (SCN)?

1. A mechanism that maintains system consistency
2. A value that is incremented when database changes are made
3. Both a and b
4. None of the above

Ans: c

12. The command used to obtain the structure of an Oracle table is:

1. DESCRIBE STRUCTURE [TableName]
2. STRUCTURE [TableName]
3. DESC TABLE [TableName]
4. DESCRIBE [TableName]

Ans: d

13. What should you type to see the contents of the SQL*Plus buffer:   

1. CURRENT
2. CONTENTS
3. BUFFER
4. LIST

Ans: d

14. What are the prefixes available to Oracle triggers?

1. old only
2. new only
3. new and :old
4. None of the above

Ans: c

15. Which is not an Oracle-supported trigger?

1. BEFORE
2. DURING
3. INSTEAD OF
4. AFTER

Ans: b

Types of Online Tests for Evaluating Oracle Programmers

If you want to assess the programming language skills of candidates, there are various domain-based and project-based tests you can use. Most of the domain-based tests offer expert-curated questions and coding scenarios to test standard skill sets in programming languages like Java, C++, Python, SQL, etc. Project-based tests help to narrow down your search and analyse any specific knowledge and skills of a particular programming language. Online assessment platforms offer you the flexibility to administer domain or project-based tests. They come with pre-set questions for quick test administering and reveals the candidate’s technical competencies in just a few simple steps. 

Applications of MeritTrac Assessment Solutions - Hiring and Workforce Development 

The skill requirements for Oracle DB requires a product-specific assessment of database knowledge and skills. With MeritTrac’s customised domain assessment tests, you can measure specific database knowledge and programming skill sets without much hassle. The domain-based tests include basic to advanced coding questions given in the form of multiple-choice questions, true or false questions, and project-based coding questions. You can also customise the test by including project-specific coding scenarios to assess technical skills. 

MeritTrac’s online assessment solutions let you evaluate a large number of Oracle DB job applicants at the same time and make hiring decisions in less time. Administering tests on the MeritTrac platform is a simple process, so even recruiters from a non-IT background can efficiently hire candidates for technical roles. Job applicants can attend the online test from any location. The remote proctoring feature lets recruiters monitor the tests to prevent any malpractices. The tests are auto evaluated, so you can make hiring decisions within a short time. 

You can identify skill gaps in employees using the Oracle skill test. The test results and comprehensive reports can be used to create training programs for updating skill sets.