Oracle Interview Questions & Answers

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Oracle technical interview questions and answers are crucial for candidates preparing for database-related roles such as Database Developer, SQL Programmer, DBA, or Data Analyst. Oracle is widely used in enterprise applications, so interviewers frequently test a candidate’s concepts in SQL, PL/SQL, joins, indexing, triggers, views, transaction management, and performance tuning. Companies like TCS, Wipro, Infosys, Capgemini, and Cognizant often include Oracle questions in both technical interviews and written tests. This guide covers the most frequently asked Oracle interview questions with clear explanations, practical examples, and beginner-friendly definitions. Whether you are preparing for a campus placement or an experienced-level interview, mastering these Oracle concepts will help you answer confidently. You can also download Oracle interview PDFs and practice company-wise mock tests to enhance your preparation.

Database professionals can deepen their Oracle expertise by studying PL/SQL programming and understanding DBMS concepts thoroughly

Showing 10 of 113 questions

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1. What is the maximum number of columns in a table of oracle DB ?

254

2. What are the components of physical database structure of Oracle database?

Oracle database is comprised of three types of files. One or more datafiles, two are more redo log files, and one or more control files.

3. What are actual and formal parameters ?

Actual Parameters : Subprograms pass information using parameters.The variables or expressions referenced in the parameter list of a subprogram call are actual parameters.For example, the following procedure call lists two actual parameters named emp_num and amount: Eg.raise_salary(emp_num, amount); Formal Parameters : The variables declared in a subprogram specification and referenced in the subprogram body are formal parameters.For example, the following procedure declares two formal paramet

4. What are the components of logical database structure of Oracle database?

There are tablespaces and databases schema objects.

5. whats the length of SQL integer?

32 bit

6. What is a tablespace?

A database is divided into Logical Storage Unit called tablespaces. A tablespace is used to grouped related logical structures together.

7. What is a transaction in Oracle ?

A transaction is a set of SQL statements between any two COMMIT and ROLLBACK statements.

8. What is SYSTEM tablespace and when is it created?

Every Oracle database contains a tablespace named SYSTEM, which is automatically created when the database is created. The SYSTEM tablespace always contains the data dictionary tables for the entire database.

9. Explain the relationship among database, tablespace and data file ?

Each databases logically divided into one or more tablespaces one or more data files are explicitly created for each tablespace.

10. What are the various types of Exceptions in Oracle ?

User defined Exceptions Predefined Exceptions