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199 The persistent messaging scheme described in this chapter depends on timestamps combined with discarding of received messages if they are too old Suggest an alternative scheme based on sequence numbers instead of timestamps 1910 Give an example where the read one, write all available approach leads to an erroneous state 1911 If we apply a distributed version of the multiple-granularity protocol of 16 to a distributed database, the site responsible for the root of the DAG may become a bottleneck Suppose we modify that protocol as follows: Only intention-mode locks are allowed on the root All transactions are given all possible intention-mode locks on the root automatically Show that these modi cations alleviate this problem without allowing any nonserializable schedules 1912 Explain the difference between data replication in a distributed system and the maintenance of a remote backup site 1913 Give an example where lazy replication can lead to an inconsistent database state even when updates get an exclusive lock on the primary (master) copy 1914 Study and summarize the facilities that the database system you are using provides for dealing with inconsistent states that can be reached with lazy propagation of updates 1915 Discuss the advantages and disadvantages of the two methods that we presented in Section 1952 for generating globally unique timestamps 1916 Consider the following deadlock-detection algorithm When transaction Ti , at site S1 , requests a resource from Tj , at site S3 , a request message with timestamp n is sent The edge (Ti , Tj , n) is inserted in the local wait-for of S1 The edge (Ti , Tj , n) is inserted in the local wait-for graph of S3 only if Tj has received the request message and cannot immediately grant the requested resource A request from Ti to Tj in the same site is handled in the usual manner; no timestamps are associated with the edge (Ti , Tj ) A central coordinator invokes the detection algorithm by sending an initiating message to each site in the system On receiving this message, a site sends its local wait-for graph to the coordinator Note that such a graph contains all the local information that the site has about the state of the real graph The wait-for graph re ects an instantaneous state of the site, but it is not synchronized with respect to any other site When the controller has received a reply from each site, it constructs a graph as follows: The graph contains a vertex for every transaction in the system The graph has an edge (Ti , Tj ) if and only if.

Stub multicast routing (SMR) allows end stations, like user PCs, to register for the multicast streams they want to receive via the IGMP protocol and allow for multicast routing When the appliance uses SMR, it acts as an IGMP proxy, where it doesn t fully participate in the multicast process

Fill in the diagonals 140 130 120 110 100 90 80 70 60 60 70 80 90 100 75 50 25 0 92 94 96 98 90 80 70 60 100 102 104 106 108 150 200 250 300

The McGraw Hill Companies, 2001

When acting as an IGMP proxy, the appliance takes IGMP queries from fully functional multicast routers and forwards them to the end-user stations IGMP queries allow a multicast router to learn the end stations that wish to receive or continue receiving a multicast stream For a multicast stream where no response is received, the multicast router assumes that no end stations wish to receive the stream and stops forwarding the stream to the associated network segment

.

There is an edge (Ti , Tj ) in one of the wait-for graphs An edge (Ti , Tj , n) (for some n) appears in more than one wait-for graph Show that, if there is a cycle in the constructed graph, then the system is in a deadlock state, and that, if there is no cycle in the constructed graph, then the system was not in a deadlock state when the execution of the algorithm began 1917 Consider a relation that is fragmented horizontally by plant-number: employee (name, address, salary, plant-number) Assume that each fragment has two replicas: one stored at the New York site and one stored locally at the plant site Describe a good processing strategy for the following queries entered at the San Jose site a Find all employees at the Boca plant b Find the average salary of all employees c Find the highest-paid employee at each of the following sites: Toronto, Edmonton, Vancouver, Montreal d Find the lowest-paid employee in the company 1918 Consider the relations employee (name, address, salary, plant-number) machine (machine-number, type, plant-number) Assume that the employee relation is fragmented horizontally by plant-number, and that each fragment is stored locally at its corresponding plant site Assume that the machine relation is stored in its entirety at the Armonk site Describe a good strategy for processing each of the following queries a Find all employees at the plant that contains machine number 1130 b Find all employees at plants that contain machines whose type is milling machine c Find all machines at the Almaden plant d Find employee 1 machine 1919 For each of the strategies of Exercise 1918, state how your choice of a strategy depends on: a The site at which the query was entered b The site at which the result is desired 1920 Compute r 1921 Is ri n rj necessarily equal to rj rj = rj n ri hold.

Table Limitations Number of Multicast Forwarding Information Base (MFIB) entries Number of IGMP groups Number of PIM routes

1922 Given that the LDAP functionality can be implemented on top of a database system, what is the need for the LDAP standard

16 MB 1,000 1,000 3,000

The McGraw Hill Companies, 2001

128 MB 3,000 3,000 7,000

Complete the matrix 140 130 120 110 100 90 80 70 60 60 50 40 30 20 15 10 5 0 92 90 70 60 50 40 35 30 25 5 94 120 150 180 210 240 270 300 100 130 160 190 220 250 270 80 110 140 175 200 220 240 70 90 120 150 175 190 210 60 80 100 120 140 160 180 55 75 80 90 110 130 150 50 55 60 70 80 100 120 30 35 40 50 60 70 90 10 15 20 30 40 50 60 96 98 100 102 104 106 108

19

128+ MB 5,000 5,000 12,000

A 1 4 1 5 8

C 3 6 4 2 7