Oracle Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. 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.
Ques 2. What are the components of logical database structure of Oracle database?
There are tablespaces and database's schema objects.
Ques 3. What is a tablespace?
A database is divided into Logical Storage Unit called tablespaces. A tablespace is used to grouped related logical structures together.
Ques 4. 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.
Ques 5. 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.
Ques 6. What is schema?
A schema is collection of database objects of a user.
Ques 7. What are Schema Objects?
Schema objects are the logical structures that directly refer to the database's data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.
Ques 8. Can objects of the same schema reside in different tablespaces?
Yes
Ques 9. Can a tablespace hold objects from different schemes?
Yes
Ques 10. What is Oracle 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.
Ques 11. What is an Oracle 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.)
Ques 12. What is Partial Backup?
A Partial Backup is any operating system backup short of a full backup, taken while the database is open or shut down.
Ques 13. 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.
Ques 14. Can a View based on another View?
Yes
Ques 15. Can a Tablespace hold objects from different Schemes?
Yes
Ques 16. Can objects of the same Schema reside in different tablespace?
Yes
Ques 17. Do View contain Data?
Views do not contain or store data.
Ques 18. 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.
Ques 19. What are the type of Synonyms?
There are two types of Synonyms Private and Public.
Ques 20. What is an Index Segment?
Each Index has an Index segment that stores all of its data.
Ques 21. What are the different type of Segments?
Data Segment, Index Segment, Rollback Segment and Temporary Segment.
Ques 22. What are Clusters?
Clusters are groups of one or more tables physically stores together to share common columns and are often used together.
Ques 23. What is an Integrity Constrains?
An integrity constraint is a declarative way to define a business rule for a column of a table.
Ques 24. 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 performance of data retrieval. Index can be created on one or more columns of a table.
Ques 25. 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.
Ques 26. 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.)
Ques 27. 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.
Ques 28. 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 table.
- Store complex queries.
Intermediate / 1 to 5 years experienced level questions & answers
Ques 29. 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.
Ques 30. What is an Oracle sequence?
A sequence generates a serial list of unique numbers for numerical columns of a database's tables.
Ques 31. 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.
Experienced / Expert level questions & answers
Ques 32. What is Mirrored on-line Redo Log?
A mirrored on-line redo log consists of copies of on-line redo log files physically located on separate disks, changes made to one member of the group are made to all members.
Ques 33. 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.
Ques 34. What does a Control file Contain?
A Control file records the physical structure of the database. It contains the following information.
Database Name
Names and locations of a database's files and redolog files.
Time stamp of database creation.
Most helpful rated by users:
- What are the components of physical database structure of Oracle database?
- What are the components of logical database structure of Oracle database?
- What is a tablespace?
- What is SYSTEM tablespace and when is it created?
- Explain the relationship among database, tablespace and data file?
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