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
31. What are the different type of Segments ?
Data Segment, Index Segment, Rollback Segment and Temporary Segment.
32. What are Clusters ?
Clusters are groups of one or more tables physically stores together to share common columns and are often used together.
33. What is an Integrity Constrains ?
An integrity constraint is a declarative way to define a business rule for a column of a table.
34. What is an Index ?
An Index is an optional structure associated with a table to have direct access to rows, which can be created to increase the
35. What is an Extent ?
An Extent is a specific number of contiguous data blocks, obtained in a single allocation, and used to store a specific type of information.
36. What is a View ?
A view is a virtual table. Every view has a Query attached to it. (The Query is a SELECT statement that identifies the
columns and rows of the table(s) the view uses.)
37. What is an Index Segment ?
Each Index has an Index segment that stores all of its data.
38. What is Table ?
A table is the basic unit of data storage in an ORACLE database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.
39. Can a view based on another view?
Yes.
40. What are the advantages of views?
- Provide an additional level of table security, by restricting access to a predetermined set of rows and columns of a table.
- Hide data complexity.
- Simplify commands for the user.
- Present the data in a different perspective from that of the base