Oracle Interview Questions

Oracle Interview Questions

7 mins read1K Views Comment
Vikram
Vikram Singh
Assistant Manager - Content
Updated on Dec 19, 2023 17:28 IST

Oracle is the world’s largest database company in the world that cater their services in almost every domain. In this article, we will discuss interview questions asked in Oracle.

2022_09_Feature-Image-Templates-65.jpg

Introduction

Larry Elison co-founded Software Development Laboratories (SDL) with two other engineers, Bob Miner and Ed Oates, in 1977. SDL changed its name from Relational Software Inc in 1979 to Oracle Systems Corporation in 1982. Today, Oracle Corporation is the world’s largest database company that sells database software and technology, cloud-engineered systems, and enterprise software product (such as ERP, HCM, CRM, EPM, and SCM). Today Oracle corporations cater their services in all domains like Energy & Water, Oil & Gas, Automotive, Food & Beverages, Retail, Travel & Hospitality, Life Science, and many more. In this article, we will discuss Oracle Interview Questions.

Must Check: Free Java Online Courses and Certifications

Must Check: Free C Online Courses and Certifications

Recommended online courses

Best-suited Databases courses for you

Learn Databases with these high-rated online courses

– / –
8 weeks
– / –
45 days
4 K
10 hours
– / –
2 months
12 K
3 months
– / –
40 hours
– / –
50 hours
13 K
– / –
50 K
4 months

Table of Content

Oracle Interview Question

Technical Interview Questions

Q1. What is Data Structure?

Data Structures are a way to demonstrate, organize, process, and manipulate data in the system. It enhances efficiency, reusability, and abstraction.

  • It is used to show the relationship between elements.
  • Provides a better management way to store data.
  • Enhances code performance.

Also Read: What is Data Structure?

Also Read: 8 Most Important Data Structure

Q2. What is LinkedList? What are its uses?

LinkedList is a linear data structure that stores the data in the form of nodes, and each node contains the element and the address of the next node.

  • LinkedList starts with HEAD (that denotes starting point) and ends with the last node pointing to a NULL value
  • Elements are stored in random locations
  • It doesn’t waste memory space

LinkedList is of three types:

  1. Singly LinkedList
  2. Doubly LinkedList
  3. Circular LinkedList

Uses of LinkedList/Application of LinkedList

  • Implementing Stacks/Graphs/Hash Table
  • Dynamic Memory Allocation
  • Maintaining a directory of names

Also Read: Introduction to LinkedList Data Structure

Also Read: LinkedList Example in C and Python

Q3. Can you implement a queue using LinkedList?

Yes, ‘queue’ can be implemented with the help of LinkedList as queue supports operations like enqueue and dequeue. The benefit of implementing a queue using a LinkedList is that it helps to arrange as many data values as you want.

Note: In an implementation of a queue using LinkedList, the first inserted node is indicated by ‘front’ while the last node is indicated by ‘rear’.

Also Read: Queue Data Structure: Type, Implementation, and Application

Also Read: ArrayList vs. LinkedList

Q4. What is the difference between a microcontroller and a microprocessor?

Microcontroller Microprocessor
Heart of Embedded System. Heart of Computer System.
It has a processor, along with internal memory and I/O components. It has only a processor. Memory and I/O components need to be connected externally.
It uses an internal controlling bus. It uses external bus to interface to RAM, ROM, and other peripherals.
Cost of entire system is low. Cost of entire system is high.
Used in AC, washing machine etc. Used in Personal Computers.

Must Check: Java Online Courses and Certifications

Q5. Can an array have elements of different data types?

No, you can’t have elements of different data types in an array. An array is used to store the elements of the same data type only

, but you can create an array with elements of different data types by declaring the array as an object.

Note: If you want to store different data types, it is better to use ArrayList.

Also Read: Implementing Array in Java

Also Read: Implementing Array in C

Q6. What is Normalization?

Normalization is the process of organizing data to remove redundancy and improve data integrity with various normal forms used step by step.

In simple terms, the normalization rule breaks the larger table into smaller tables and then links them using relationships.

There are four different normal forms, that are used to enhance the distribution of data

  1. 1st Normal Form
  2. 2nd Normal Form
  3. 3rd Normal Form
  4. Boyce-Codd Normal Form

Also Read: Introduction to Normalization

Must Check: C++ Online Courses and Certifications

Q7. What do you mean by the term data segment?

In C programming language, all the variables, functions, and data structure are stored in a special memory location known as Data Segment. It has four components:

  • Data Area
  • Code Area
  • Heap Area
  • Stack Area

Q8. What is the method of overloading and overriding?

Overloading

  • It means having two or more methods (or functions) with the same name but different parameters.
  • It implements compile time polymorphism.
  • It occurs between methods in the same class.

Also Read: Method Overloading in Java

Overriding

  • Method overriding is redefining a superclass method with the same name, data type, and parameter in a sub-class.
  • It implements runtime polymorphism.
  • It occurs between the superclass and subclass.

Also Read: Method Overriding in Java

Must Check: C++ Online Courses and Certifications

Q9. What is the difference between TRUNCATE and DELETE

TRUNCATE TABLE DELETE TABLE
It is a DDL command. It is a DML command.
Remove all rows from the table without using the WHERE clause. Remove all or specific rows from the table using the WHERE clause.
Remove all the records at a time  by delocating the pages that are used to store the data. It removes one row (a record) at a time.
It can’t be used with indexed views. It can be used with indexed views.
Reset the identity to its seed value It retains the identity and doesn’t reset it to the seed value.

Also Read: SQL TRUNCATE

Also Read: SQL DELETE

Q10. Difference between SQL and SQL*PLUS

SQL SQL*PLUS
It is a standard database language. It is a block-structured language.
Variable are not available. Variables, constraints, and data type are available.
It allows to manipulate data and table definition in the database. It doesn’t allow manipulation in the database.
Use function to perform formatting. Use command to perform formatting.
Keywords can’t be abbreviated. Keywords can be abbreviated.
Top C++ Interview Questions and Answers for 2024
Top 160+ Java Interview Questions and Answers for 2024
Zoho Interview Questions and Answers

HR Interview Questions

Q1. Tell me about yourself.

This is the first question you will encounter in the HR interview.
Here, you have to introduce yourself, work experience (if you have any), academic records, and your previous job-profile (if you are fresher, discuss your project and internships).

Q2. Why Oracle, and what do you know about us?

Start your answer with what you know about Oracle and then why oracle.

About Oracle:

  • World’s most extensive database management company
  • Caters services in almost all domains such as Energy & Water, Oil & Gas, Automotive, Food & Beverages, Retail, Travel & Hospitality, Life Science, and many more.
  • The company sells database software and technology, cloud-engineered systems, and enterprise software product. 

Why Oracle

  • Work-Life Balance
  • Flexible Working Hours
  • Learning Opportunities from the best in the domain

Q3. How will your qualification help you in doing this job?

This type of question is mostly asked from the freshers or the candidates who are switching careers to another domain or you had a career break.
Here, the interviewer wants to hear why you are a good fit for the company. So tell him about your strength, your past work experience, and your projects or internships that match the job description.

Q4. What changes will you make in the system if you come on board with us?

These types of questions are asked when you are applying for a senior-level position or in management:

So, you can answer like:

  • I will make sure everyone (fellow workers) is getting all benefits accordingly
  • I will ensure that everyone is working to the fullest and will allow my fellow workers to work freely

Q5. What will be your favorite work location?

The companies have different branches worldwide, and after the pandemic, the companies started offering to work remotely. So, you can choose any option depending on your choice work from home or office.
But, one of the answers can be the following:
I’m open and flexible to the location of this role and interested in working remotely if the job allows it.”

12 Essential TCS HR Interview Questions and Answers for 2025
Top HR Interview Questions and Answers

Oracle Interview Round and Process

The interview process is relatively smooth and hard as they hire the best brains (highly skilled people) from different backgrounds. The overall interview process takes place in four rounds:

  • Online Test
  • Telephonic Interview
  • Technical Interview
  • HR Interview

Online Test: This is the first round of the interview process, where you will find questions on core topics such as DBMS, OOPs concept, and Networking, as well as the questions from quantitative and logical reasoning. In this round, all the questions will be Multiple Choice Questions (MCQs)

Telephonic Round: This round can be called First Technical Interview (Basic Technical Round). Here, the interviewer will ask one-two fundamental questions about DBMS, Data Structure, and algorithms.

This round is done to assess the candidate’s skills and experience.

Technical Interview: Here comes the most crucial round, the coding round. In this step, your coding skills are tested, and you will be asked advanced questions from Data Structure & Algorithms, puzzles, and questions from your past projects.

HR Interview: This is the last and most straightforward step in the recruitment process. If you are here, you can be a bit relaxed. In this round, HR will ask questions to know more about you, your work experience, and your expectations and will share the details about the company and the job profile. 

Preparation Tips

  1. Stay focused.
  2.  Practice coding questions.
  3. Should have command of at least one programming Language.
  4. View previous interviews of the company applying to clear basic first.
About the Author
author-image
Vikram Singh
Assistant Manager - Content

Vikram has a Postgraduate degree in Applied Mathematics, with a keen interest in Data Science and Machine Learning. He has experience of 2+ years in content creation in Mathematics, Statistics, Data Science, and Mac... Read Full Bio