Top Oracle Interview Questions and Answers

Introduction and Interview process

 

Oracle is a database management system that includes a couple of programming languages along with a few application softwares. Oracle can help you manage your data, prevent security breaches, and provide seamless access to applications. It is a reputed multinational company that is known in the industry for its competence. Programming languages such as java and Python are one of the foundations of Oracle.

Want to be an employee at Oracle? What are some of the Oracle interview questions? If you want to know about questions and answers related to the Oracle interview, you are in the right place. 

Learn about the various types of Oracle interview questions and their answers in this article:

 

According to Oracle's hiring team, to truly build for everyone, a diversity of perspectives and experiences and a fair hiring process is the first step in getting there.

Here is the interview process conducted by Oracle to hire a capable workforce for themselves. Oracle interview experience is different for different individuals. But there is a typical pattern that is followed for the selection of workforce at Oracle.

Let us learn more about how the hiring process at Oracle looks like: -

Online Coding Round: First, an online test round is conducted where Multiple Choice Questions ranging from logical reasoning and quantitative analysis to core subjects such as Data Structures and Algorithms, Networking, Object Oriented Programming, and Database Management Systems are asked.

Technical Interview Round 1:In the Technical Interview Round, a video or phone call is scheduled with the candidate, and his coding skills are assessed. The interviewer generally asks two questions to the candidate based on Data Structures and Algorithms.

Technical Interview Round 2:This is a personal interview round where tricky and complex questions based on data structures are asked. Questions related to the candidate's CV may also be asked in this round.

Also, some interviewers like to ask for puzzles to test the thinking ability of the candidate.

HR Round: This is an informal round where the interviewer can ask general questions about the candidate's work experience and ethics-related inquiries. This helps the company to decide whether the applicant is a cultural fit for their company.

 

 

Some General Questions

 

1) What is the difference between varchar and varchar2 data types?

Varchar can store up to 2000 bytes, and varchar2 can store double that. Varchar will occupy space for NULL values, and Varchar2 will not occupy any space. Both have differed concerning their area.

 

2) In which language has Oracle been developed?

Oracle has been developed using C Language.

 

 3) What is a RAW datatype?

RAW datatype stores values in binary data format—the maximum size for a raw in a table is 32767 bytes.

 

4) What is the use of the NVL function?

The NVL function replaces NULL values with another or given value. Example is –

NVL (Value, replace value)

 

5) Whether any commands are used for Month calculation? If so, what are they?

In Oracle, the months between function is used to find the number of months between the given dates. Example is –

Months between (Date 1, Date 2)

The questions mentioned above were some of the general questions related to Oracle, and they are not restricted by categories.

 

 

Oracle Interview Questions for Experienced Professionals

Q1. What are the different types of modules associated with Oracle forms?

The different types of modules associated with Oracle forms include:

The different types of modules associated with Oracle forms include:

- Form module

- Menu module

- Object Library module

- SQL module

 

Q2. Which are the fundamental types of Joins used in Oracle to write subqueries?

This is one of the most common Oracle interview questions for experienced professionals. The main types of Joins that are used to write subqueries in the Oracle database are:

- Self Join

- Equi Join

- Outer Join

 

Q3. Explain the use of the Control File in Oracle.

The Control file in the Oracle database is used to identify log files that need to be opened for certain database operations to occur. It is also used for database recovery.

 

Q4. What are Actual and Formal Parameters?

Expressions and variables referenced in the parameter list of a subprogram are called Actual Parameters.

Variables that are declared within the body of the subprogram are known as Formal Parameters.

 

Q5. Which are the different types of database objects in Oracle?

There are fundamentally five different types of database objects that include:

- Tables

- Views Indexes

- Tablespaces

- Indexes

- Synonyms

 

 

Oracle Interview Questions for Freshers

Oracle interview questions for freshers are the typical questions that are asked in all companies. Here are some of them:

1) What do you know about our company?

This question is generally asked by the interviewer or hiring manager at the beginning of the conversation to know how much you are aware of the organization where you want to work.

The best way to tackle this interview question is to research the company where you will face the interview.

Read online about the company's latest updates, understand its business, and thoroughly read the job description.

 

2) How did you hear about this job?

The interviewer asks this question to see the candidate's interest in the company and job profile. Generally, the candidates answer this question by saying I have got the notification through some job portal or website where I have applied.

I also desire to work for this company, so I have checked its official website, where I see the job openings, and I am here. If you know any company employee who has advised you to apply to this company, this would be a good time to mention their name.

 

3) Why do you want to work here? / Why do you want to work with this company?

This is a general interview question that companies ask fresher to know what they want and how much they know about the company they are applying for.

Before appearing for the interview, the candidates are always recommended to study and learn about the company's background, values, operations, services, and other vital details.

 

 

Oracle Technical Interview Questions

Some of the questions for highly skilled people in the industry:

1) List the various components of the physical database structure of an Oracle database.

The different components of the physical database structure of an Oracle database are listed down below: -

- Greater than equal to two redo log files.

- Greater than equal to one data file.

- Greater than equal to one control file.

 

2) Define a tablespace in context with the Oracle database. 

The Logical Storage Unit of an Oracle database is called a tablespace. It is nothing but a set of related logical structures.

Tablespace groups relate the analytical systems of the database together. Logically, the data is stored in the tablespaces in Oracle, and physically, the information is stored in the data files associated with the respective tablespaces.

 

 

Conclusion

These were some of the oracle interview questions and their answers to help you pass your interview. These can serve as the foundation for your Oracle interview preparations. We hope this list was helpful. All the best for your interviews.

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