SophiaPretty

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Category > Computer Science Posted 04 Dec 2017 My Price 10.00

DataBase Management System

Hi totur,

Kindly, help me with attached questions ?

Thanks,,,

 

Assignment 3

Deadline: Day 05/05/2017 @ 23:59

[Total Mark for this Assignment is (24 /3 = 8 ) ]

DataBase Management System

IT 344

                                                                                                         

 

                                                                     

Student Details:

                       

Name:

 

CRN:                ID:

 

                       

Instructions:

•           This Assignment must be submitted on Blackboard via the allocated folder.

•           Email submission will not be accepted.

•           You are advised to make your work clear and well-presented, marks may be reduced for poor presentation.

•           You MUST show all your work.

•           Late submission will result in ZERO marks being awarded.

•           Identical copy from students or other resources will result in ZERO marks for all involved students.

•           Convert this Assignment to PDF just before submission.



 

3Marks
Question One

Consider a checkpoint protocol and the following operations in the log.

[start_transaction,T4]

[Write_Item,T4,D,20,30]

[start_transaction,T1]

[Commit, T4]

[Write_Item,T1,C,5,9]

[Checkpoint]

[start_transaction,T2]

[Write_Item,T2,B,3,9]

[Commit, T2]

[start_transaction,T3]

[Write_Item,T3,C,9,15]

..CRASH….

 

when a crash happens, the recovery  system tries to recover by using both undo and redo operations. what are the transaction(s)  of the undo list and the redo list?

 

UNDO

REDO

 

 

 

 

 

 

5Marks
Question Two

A) List the main control measures that are used to provide security of data in databases?

B) Explain briefly about Access Protection, User Accounts, and Database Audits

 

3 Marks
Question three

What are the main potential advantages of distributed database?

 

 

5 Marks
Question Four

What are triggers? How to invoke a trigger on demand? List the four instances when triggers are appropriate?                                                 

 

                 

 

8 Marks
Question Five

Consider the project relation :

 

project

PNo

Pname

Budget

Location

p1

Database develop

250,000

riyadh

p2

Maintenance

125,000

jeddah

p3

CAD

170,000

abha

p4

Design

200,000

madinah

p5

instrumentation

100,000

qasim

 

1.    applyhorizontal fragmentations:

a.       table1 projects with budget less than 150,000.

 b.    table2 projects with budget greater than or equal to  150,000.

 

 

 

2. apply  vertical fragmentations :

a.       table1 information about project budget.

b.      table2 information  about projects names and locations.

 

 

 

 

 

 

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SophiaPretty
(5)
Status NEW Posted 04 Dec 2017 01:12 PM My Price 10.00

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