Oracle Interview Questions & Answers

Showing 10 of 113 questions | Page 3

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

21. What is Full Backup ?

A full backup is an operating system backup of all data files, on-line redo log files and control file that constitute ORACLE database and the parameter.

22. Can a View based on another View ?

Yes.

23. Can a Tablespace hold objects from different Schemes ?

Yes.

24. Can objects of the same Schema reside in different tablespace ?

Yes.

25. What is the use of Control File ?

When an instance of an ORACLE database is started, its control file is used to identify the database and redo log files that must be opened for database operation to proceed. It is also used in database recovery.

26. Do View contain Data ?

Views do not contain or store data.

27. What are the Referential actions supported by FOREIGN KEY integrity constraint ?

UPDATE and DELETE Restrict - A referential integrity rule that disallows the update or deletion of referenced data. DELETE Cascade - When a referenced row is deleted all associated dependent rows are deleted.

28. What are the type of Synonyms?

There are two types of Synonyms Private and Public.

29. What is a Redo Log ?

The set of Redo Log files YSDATE,UID,USER or USERENV SQL functions, or the pseudo columns LEVEL or ROWNUM.

30. 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
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