Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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]
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};
What is meant by log-based recovery? The most widely used structures for recording database changes is the log. The log is a sequence of log records, recording all the update a
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
What is serializability? Explain its types? The data base system must control concurrent implementation of transactions, to ensure that the data base state remains consistent.
QUESTION (a) Give two advantages of using Linked List as compared to arrays. (b) (i) You are working as programmer at the Orange Mauritius branch. You have been asked to cre
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
Define outer union operation of the relational algebra. Compute the outer union for the relations R and S given below. Outer Join - If there are any values in one tabl
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
Explain Candidate Key and Super Key A super key is a set of one or more than attributes that, taken collectively, permits us to identify uniquely a tuple in the relation. Wher
Question: The following relational database schema corresponds to a part of a database used by the Registry Department of a university. DEPARTMENT (d#, d-name, head-of-dept)
Ways for Selecting Data Structure Algorithms operate on data structure. Therefore, selection of the best algorithm means selecting the best data structure from whole bunch. Th
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd