Describe the grant function and explain security, Database Management System

Assignment Help:

Describe the GRANT function and explain, how it associates to security. What kind of privileges may be granted? How are they revoked?

Ans: Since more than one user can aaccess one database, there exists the required to restrict user from using whole database in any way. Setting up access privilege can do this. Any privilege can be granted to or revoked from user along with taken of the GRANT and REVOKE statements. Each privilege could be granted or revoked individually or in a group. Such group of rights is known as ROLE and rights can be granted or revoked within in the similar way as to the user. Access privileges include SELECT, INSERT, UPDATE and DELETE.

GRANT {statement|role_name} ON {object_name} TO {user|role_name_2} [WITH GRANT OPTION]

1038_tablea.png

An example of granting permission to user B for reading EMP table is:

GRANT SELECT ON emp to B;

The REVOKE statement is used to revoke the permissions from the user.
The syntax for REVOKE statement is given as:
REVOKE {statement|role_name} FROM {user|role_name};


Related Discussions:- Describe the grant function and explain security

What is equi join, What is equi join? Equi Join - It generates all th...

What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).

How can we classify the operations on classes, How can we Classify the oper...

How can we Classify the operations on classes  This step fundamentally means all three models functional, object and dynamic (studied in last section) must be combined so that

Explain sorted file with advantages, Explain sorted File with advantages? ...

Explain sorted File with advantages?  Sorted file The sort utility shall perform one of the subsequent functions: 1.Sort lines of all the named files together and write the

Describe disk manager and their work, Describe disk manager and their work?...

Describe disk manager and their work? Disk Manager: Responsible for fetching data regulated through file Manager from disk storage within Main memory and deciding what data to

What are the benefits of decomposing a system, What are the benefits of dec...

What are the benefits of decomposing a system? The benefits of decomposing a system into subsystems are that after decomposition, each individual component become smaller and e

How many types of data independence have, Types of data independence D...

Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi

Relational schema for person, Example: RELATIONAL SCHEMA for PERSON: ...

Example: RELATIONAL SCHEMA for PERSON: PERSON (PERSON_ID: integer, NAME: string, AGE: integer, ADDRESS: String) RELATION INSTANCE In this instance, m = 3 and n = 4

What is assertion, What is assertion? Mention the forms available. An a...

What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.

Illustration of implementation of inheritance, Illustration of implementati...

Illustration of implementation of inheritance Let us take the illustration of implementation of inheritance. Suppose that we are about to implement the Stack class and by now w

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd