Oracle Database Architecture Interview Preparation Guide

Oracle Database Concepts Architecture Interview Questions and Answers will build a knowledge and confidence to face a successful interview. Learn the basic concepts and architecture of an Oracle Database with the help of this Oracle Database Concepts Architecture Interview Questions with Answers guide

18 Database Architecture Questions and Answers:

1 :: What is an Oracle Rollback Segment?

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

2 :: What are the uses of Oracle Rollback Segment?

Rollback Segments are used :
To generate read consistent database information during database recovery to rollback uncommitted transactions for users

3 :: What are Oracle Schema Objects?

Schema objects are the logical structures that directly refer to the databases data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.

4 :: What is an Oracle Data Block?

ORACLE database's data is stored in data blocks. One data block corresponds to a specific number of bytes of physical database space on disk.

Oracle database consists of logical storage place which is called as blocks and the bytes in a block is set through DB_BLOCK parameter in parameter file

5 :: Can objects of the same Schema reside in different tablespaces?

Yes objects of the same Schema reside in different tablespaces

6 :: What is the use of Oracle 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.

Control files is a binary file. Before database is opened it determines whether database is in valid state or not. If yes then database is opened.

7 :: Can a View based on another View in Oracle?

Yes a View based on another View in Oracle

8 :: What is the function of Redo Log in Oracle?

The Primary function of the redo log is to record all changes made to data

9 :: Describe the different type of Integrity Constraints supported by ORACLE?

NOT NULL Constraint - Disallows Nulls in a table's column.
UNIQUE Constraint - Disallows duplicate values in a column or set of columns.
PRIMARY KEY Constraint - Disallows duplicate values and Nulls in a column or set of columns.
FOREIGN KEY Constrain - Require each value in a column or set of columns match a value in a related table's UNIQUE or PRIMARY KEY.
CHECK Constraint - Disallows values that do not satisfy the logical expression of the constraint.

10 :: What is an Oracle Data Dictionary?

The data dictionary of an ORACLE database is a set of tables and views that are used as a read-only reference about the database.
It stores information about both the logical and physical structure of the database, the valid users of an ORACLE database, integrity constraints defined for tables in the database and space allocated for a schema object and how much of it is being used.