Oracle Interview Questions & Answers

Showing 10 of 113 questions | Page 5

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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41. What is an Oracle sequence?

A sequence generates a serial list of unique numbers for numerical columns of a databases tables.

42. What is a synonym?

A synonym is an alias for a table, view, sequence or program unit.

43. What are the types of synonyms?

There are two types of synonyms private and public.

44. What is a private synonym?

Only its owner can access a private synonym.

45. What is a public synonym?

Any database user can access a public synonym.

46. What are synonyms used for?

- Mask the real name and owner of an object. - Provide public access to an object - Provide location transparency for tables, views or program units of a remote database. - Simplify the SQL statements for database users.

47. What is an Oracle index?

An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table.

48. How are the index updates?

Indexes are automatically maintained and used by Oracle. Changes to table data are automatically incorporated into all relevant indexes.

49. What is a Tablespace?

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

50. What is Rollback Segment ?

A Database contains one or more Rollback Segments to temporarily store “undo” information.