Oracle Database Structure and Schema Interview Questions

Oracle Database Structure and Schema Interview Questions

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.

2.What are the components of logical database structure of Oracle database?
There are tablespaces and database's schema objects.

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.

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.

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.

6.What is schema?
A schema is collection of database objects of a user.

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.

8.Can objects of the same schema reside in different tablespaces?


9.Can a tablespace hold objects from different schemes?

10.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.

11.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.

12.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.

13.Can a View based on another View?

14.Can a Tablespace hold objects from different Schemes?

15.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.

16.Do View contain Data?
Views do not contain or store data.

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.

17.What are the type of Synonyms?
There are two types of Synonyms Private and Public.


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