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205 With pipelined parallelism, it is often a good idea to perform several operations in a pipeline on a single processor, even when many processors are available a Explain why b Would the arguments you advanced in part a hold if the machine has a shared-memory architecture Explain why or why not c Would the arguments in part a hold with independent parallelism (That is, are there cases where, even if the operations are not pipelined and there are many processors available, it is still a good idea to perform several operations on the same processor ) 206 Give an example of a join that is not a simple equi-join for which partitioned parallelism can be used What attributes should be used for partitioning 207 Consider join processing using symmetric fragment and replicate with range partitioning How can you optimize the evaluation if the join condition is of the form | rA sB | k, where k is a small constant Here, | x | denotes the absolute value of x A join with such a join condition is called a band join 208 Describe a good way to parallelize each of the following a b c d e f The difference operation Aggregation by the count operation Aggregation by the count distinct operation Aggregation by the avg operation Left outer join, if the join condition involves only equality Left outer join, if the join condition involves comparisons other than equality g Full outer join, if the join condition involves comparisons other than equality

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the packet is dropped If a match is found, a translation entry is built and added to the xlate table, the TCP sequence number is randomized, and the TCP connection is added to the conn table The appliance then increments the embryonic connection counter An embryonic connection is a half-open connection: it hasn t gone through the three-way handshake The appliance keeps track of this kind of information to limit the effectiveness of TCP SYN flood attacks If the limit is exceeded, the appliance will implement its TCP Intercept feature, discussed later in the chapter The two idle timers are then started for the connection in the conn and xlate tables respectively If you examine the Outside Network column above part 2, this shows the packet header as it leaves the appliance Notice that the source address was changed because of a match on the configured translation policy, and the TCP sequence number was randomized Also notice that the source port number was not changed

209 Recall that histograms are used for constructing load-balanced range partitions a Suppose you have a histogram where values are between 1 and 100, and are partitioned into 10 ranges, 1 10, 11 20, , 91 100, with frequencies 15, 5, 20, 10, 10, 5, 5, 20, 5, and 5, respectively Give a load-balanced range partitioning function to divide the values into 5 partitions b Write an algorithm for computing a balanced range partition with p partitions, given a histogram of frequency distributions containing n ranges 2010 Describe the bene ts and drawbacks of pipelined parallelism 2011 Some parallel database systems store an extra copy of each data item on disks attached to a different processor, to avoid loss of data if one of the processors fails a Why is it a good idea to partition the copies of the data items of a processor across multiple processors b What are the bene ts and drawbacks of using RAID storage instead of storing an extra copy of each data item

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Once the destination receives the packet, it responds back with a TCP SYN/ACK response in part 3 of Figure 5-4 Upon receiving the packet, the appliance compares the header information with the conn table to find a match; in this case, since the source initiated the connection in part 1, the connection is in the table The appliance then validates the idle timer to ensure that the entry in the state table hasn t expired: If the entry has expired, it is removed from the conn table and the packet is dropped If there wasn t a match in the conn table or the entry had timed out, then the ACL on the interface would be used to validate whether the packet was allowed inbound to the inside interface Originally the source used a sequence number of 49,000, which was randomized by the appliance to 70,000 The destination acknowledges back one greater than the randomized sequence number: 70,001 However, the source is expecting 49,001: therefore, the appliance then undoes the randomization of the acknowledgment number This is the sequence number randomization (SNR) feature at work, which is used to defeat session hijacking attacks The appliance then undoes the translation, changing the destination IP address from 192168020 to 100111 After this, the appliance resets the idle timers for the entries in the xlate and conn tables Lastly, the appliance forwards the packet out the inside interface, shown in part 4

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