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

Illustrate the fifth normal form, Fifth Normal Form (5NF) These relatio...

Fifth Normal Form (5NF) These relations still have a difficulty. While defining the 4NF we mentioned that all the attributes depend upon each other. Whereas creating the two ta

What is the used of specifying alias, What is the used of specifying alias?...

What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.

Difference among a primary index and a secondary index, What is the differe...

What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.

Sparse and dense indexes, Sparse and Dense Indexes These indexes in pri...

Sparse and Dense Indexes These indexes in principle are the similar as that of indexes used at the back of the book. The key facts of the indexes are: They are arranged

What is the need of a log in a dbms, What is the need of a log in a DBMS? B...

What is the need of a log in a DBMS? Briefly describe the various types of records that are normally present in a log.            Ans:  The system log, which is generally writt

What are the aggregate objects in the data dictionary, What are the aggrega...

What are the aggregate objects in the data dictionary? Views Match codes Lock objects.

What are uncommitted modifications, What are uncommitted modifications? ...

What are uncommitted modifications? The immediate-modification technique permits database modifications to be output to the database whereas the transaction is still in the act

What is data mining?, Question 1 Define OLTP? Explain the Differences betw...

Question 1 Define OLTP? Explain the Differences between OLTP and Data Warehouse Question 2 What is Architecture? Explain various components involved in it Question

What is a recursive relationship, Question: (a) Can a set of data requi...

Question: (a) Can a set of data requirements be correctly modelled by two or more different ER diagrams? Explain your answer. You may use a small example, if you think it will

Create a database for their customers, The ABC Bank authority now wants to ...

The ABC Bank authority now wants to create a database for their customers. So you are requested to modify your program of Assignment A3 as follows. The main program first displa

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