Question 1. This question concerns distributed systems in general. a. Explain briefly what resource(s) are managed by a database server and why. b. With examples from the distributed system in Figure 1, explain briefly what access and location transparency are. Host: B Host: A (hosta.distsys.com) Host: C (hostc.distsys.com) (hostb.distsys.com) I Process: Process: Process: Database Database Client 1 Server 2 Server 3 Process: Database Internet Server 1 LAN (via router) Figure 1: example distributed system for questions 1-5 c. In Figure 1, Client 1 sends a query to Database Server 2. Describe briefly why Client 1 might not receive an answer to its query, i.e. what faults may occur. d. First, considering ONLY Client 1 and Database Server 2 explain briefly what if anything Client 1 could do to tolerate each fault, whether it would help and why. e. Second, if you could also make use of Database Server 1 and Database Server 3 explain briefly how to you could increase the chance of Client 1 being able to get an answer to a query. f. For the approach you have suggested in your answer to Question 1(e), consider the following sequence of events: (i) Database Server 2 crashes; (ii) Client 1 updates the database; (iii) Database Server 2 re-starts; (iv) Client 1 queries the database. Explain how the Database Servers can ensure that Client 1 still receives the correct answer.
Question 1. This question concerns distributed systems in general. a. Explain briefly what resource(s) are managed by a database server and why. b. With examples from the distributed system in Figure 1, explain briefly what access and location transparency are. Host: B Host: A (hosta.distsys.com) Host: C (hostc.distsys.com) (hostb.distsys.com) I Process: Process: Process: Database Database Client 1 Server 2 Server 3 Process: Database Internet Server 1 LAN (via router) Figure 1: example distributed system for questions 1-5 c. In Figure 1, Client 1 sends a query to Database Server 2. Describe briefly why Client 1 might not receive an answer to its query, i.e. what faults may occur. d. First, considering ONLY Client 1 and Database Server 2 explain briefly what if anything Client 1 could do to tolerate each fault, whether it would help and why. e. Second, if you could also make use of Database Server 1 and Database Server 3 explain briefly how to you could increase the chance of Client 1 being able to get an answer to a query. f. For the approach you have suggested in your answer to Question 1(e), consider the following sequence of events: (i) Database Server 2 crashes; (ii) Client 1 updates the database; (iii) Database Server 2 re-starts; (iv) Client 1 queries the database. Explain how the Database Servers can ensure that Client 1 still receives the correct answer.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Question 1. This question concerns distributed systems in general.
a. Explain briefly what resource(s) are managed by a database server and why.
b. With examples from the distributed system in Figure 1, explain briefly what access and
location transparency are.
Host: A
Host: C
Host: B
(hostb.distsys.com)
(hosta.distsys.com)
(hostc.distsys.com)
I
Process:
Process:
Process:
Database
Database
Client 1
Server 2
Server 3
Process:
Database
Server 1
LAN
Internet
(via router)
Figure 1: example distributed system for questions 1-5
c. In Figure 1, Client 1 sends a query to Database Server 2. Describe briefly why Client 1
might not receive an answer to its query, i.e. what faults may occur.
d. First, considering ONLY Client 1 and Database Server 2 explain briefly what if
anything Client 1 could do to tolerate each fault, whether it would help and why.
e. Second, if you could also make use of Database Server 1 and Database Server 3
explain briefly how to you could increase the chance of Client 1 being able to get an
answer to a query.
f. For the approach you have suggested in your answer to Question 1(e), consider the
following sequence of events: (i) Database Server 2 crashes; (ii) Client 1 updates the
database; (iii) Database Server 2 re-starts; (iv) Client 1 queries the database. Explain
how the Database Servers can ensure that Client 1 still receives the correct answer.
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