Sunday, 8 February 2015

Latest Database Architecture Interview Questions and Answers

Below are some important Database Architecture interview questions which are asked in most MNC company interviews for beginners or professionals.

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.
More Questions & Answers :-
Part1  Part2  Part3  Part4

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