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167 Show by example that there are schedules possible under the tree protocol that are not possible under the two-phase locking protocol, and vice versa 168 Consider the following extension to the tree-locking protocol, which allows both shared and exclusive locks: A transaction can be either a read-only transaction, in which case it can request only shared locks, or an update transaction, in which case it can request only exclusive locks Each transaction must follow the rules of the tree protocol Read-only transactions may lock any data item rst, whereas update transactions must lock the root rst Show that the protocol ensures serializability and deadlock freedom 169 Consider the following graph-based locking protocol, which allows only exclusive lock modes, and which operates on data graphs that are in the form of a rooted directed acyclic graph A transaction can lock any vertex rst To lock any other vertex, the transaction must be holding a lock on the majority of the parents of that vertex Show that the protocol ensures serializability and deadlock freedom 1610 Consider the following graph-based locking protocol that allows only exclusive lock modes, and that operates on data graphs that are in the form of a rooted directed acyclic graph A transaction can lock any vertex rst To lock any other vertex, the transaction must have visited all the parents of that vertex, and must be holding a lock on one of the parents of the vertex Show that the protocol ensures serializability and deadlock freedom 1611 Consider a variant of the tree protocol called the forest protocol The database is organized as a forest of rooted trees Each transaction Ti must follow the following rules: The rst lock in each tree may be on any data item The second, and all subsequent, locks in a tree may be requested only if the parent of the requested node is currently locked Data items may be unlocked at any time A data item may not be relocked by Ti after it has been unlocked by Ti Show that the forest protocol does not ensure serializability 1612 Locking is not done explicitly in persistent programming languages Rather, objects (or the corresponding pages) must be locked when the objects are accessed Most modern operating systems allow the user to set access protections (no access, read, write) on pages, and memory access that violate the access protections result in a protection violation (see the Unix mprotect command, for example) Describe how the access-protection mechanism can be.

We suggest that companies consider the following adjustments to the traditional flat commission formula for income producers when presented with the following conditions:

You need to specify the server or servers to redirect requests to with the dhcprelay server command if you have more than one DHCP server, you can execute the command multiple times The timeout parameter is used when more than one server is

The McGraw Hill Companies, 2001

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configured; if the first server doesn t respond within the configured time, the request is forwarded to the second server The setroute parameter is used to override the default gateway address assigned by the DHCP server and to use an IP address on the appliance itself The enable parameter enables the DHCP relay functionality You can use the

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used for page-level locking in a persistent programming language (Hint: The technique is similar to that used for hardware swizzling in Section 1194) 1613 Consider a database system that includes an atomic increment operation, in addition to the read and write operations Let V be the value of data item X The operation increment(X) by C sets the value of X to V + C in an atomic step The value of X is not available to the transaction unless the latter executes a read(X) Figure 1623 shows a lockcompatibility matrix for three lock modes: share mode, exclusive mode, and incrementation mode a Show that, if all transactions lock the data that they access in the corresponding mode, then two-phase locking ensures serializability b Show that the inclusion of increment mode locks allows for increased concurrency (Hint: Consider check-clearing transactions in our bank example) 1614 In timestamp ordering, W-timestamp(Q) denotes the largest timestamp of any transaction that executed write(Q) successfully Suppose that, instead, we de ned it to be the timestamp of the most recent transaction to execute write(Q) successfully Would this change in wording make any difference Explain your answer 1615 When a transaction is rolled back under timestamp ordering, it is assigned a new timestamp Why can it not simply keep its old timestamp 1616 In multiple-granularity locking, what is the difference between implicit and explicit locking 1617 Although SIX mode is useful in multiple-granularity locking, an exclusive and intend-shared (XIS) mode is of no use Why is it useless 1618 Use of multiple-granularity locking may require more or fewer locks than an equivalent system with a single lock granularity Provide examples of both situations, and compare the relative amount of concurrency allowed 1619 Consider the validation-based concurrency-control scheme of Section 163 Show that by choosing Validation(Ti ), rather than Start(Ti ), as the timestamp of transaction Ti , we can expect better response time provided that con ict rates among transactions are indeed low.

Campus Network DHCP Server 19216812 NTP Server 19216813 Syslog Server 19216814 ASA Configuration E0/1 campus 100 E0/0 users 0 ASA 5510 E0/0 19216821

The McGraw Hill Companies, 2001

Increase commission rates if the income producer is instrumental in adding substantial incremental growth Reward the economic contribution of the income producers when they singularly drive new revenue growth Provide a progressive commission rate for these new dollarsA progressive ramp commission schedule motivates additional sales, recognizes contribution, and helps contribute to seller loyalty Figure 6-7 is an illustration of a progressive

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