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from account B to account A Let schedule 8 be as de ned in Figure 1511 We claim that schedule 8 is not con ict equivalent to the serial schedule <T1 ,T5 >, since, in schedule 8, the write(B) instruction of T5 con icts with the read(B) instruction of T1 Thus, we cannot move all the instructions of T1 before those of T5 by swapping consecutive noncon icting instructions However, the nal values of accounts A and B after the execution of either schedule 8 or the serial schedule <T1 ,T5 > are the same $960 and $2040, respectively We can see from this example that there are less stringent de nitions of schedule equivalence than con ict equivalence For the system to determine that schedule 8 produces the same outcome as the serial schedule <T1 ,T5 >, it must analyze the computation performed by T1 and T5 , rather than just the read and write operations In general, such analysis is hard to implement and is computationally expensive However, there are other de nitions of schedule equivalence based purely on the read and write operations We will consider one such de nition in the next section

ciscoasa(config)# no shun src_IP_addr [vlan VLAN_ID]

In this section, we consider a form of equivalence that is less stringent than con ict equivalence, but that, like con ict equivalence, is based on only the read and write operations of transactions

The security appliances can collect detailed statistics on both permitted and dropped traffic rates The following sections will discuss how to enable and view the appliance threat statistics

T1 read(A) A := A 50 write(A)

24:

read(B) B := B 10 write(B) read(B) B := B + 50 write(B) read(A) A := A + 10 write(A) Figure 1511 Schedule 8

Target Discount Rate 8%

By default, only statistics for ACLs are enabled To enable all the threat statistics on the appliance, use the threat-detection statistics command:

The McGraw Hill Companies, 2001

ciscoasa(config)# threat-detection statistics [{access-list | host | port | protocol}]

.

Consider two schedules S and S , where the same set of transactions participates in both schedules The schedules S and S are said to be view equivalent if three conditions are met: 1 For each data item Q, if transaction Ti reads the initial value of Q in schedule S, then transaction Ti must, in schedule S , also read the initial value of Q 2 For each data item Q, if transaction Ti executes read(Q) in schedule S, and if that value was produced by a write(Q) operation executed by transaction Tj , then the read(Q) operation of transaction Ti must, in schedule S , also read the value of Q that was produced by the same write(Q) operation of transaction Tj 3 For each data item Q, the transaction (if any) that performs the nal write(Q) operation in schedule S must perform the nal write(Q) operation in schedule S Conditions 1 and 2 ensure that each transaction reads the same values in both schedules and, therefore, performs the same computation Condition 3, coupled with conditions 1 and 2, ensures that both schedules result in the same nal system state In our previous examples, schedule 1 is not view equivalent to schedule 2, since, in schedule 1, the value of account A read by transaction T2 was produced by T1 , whereas this case does not hold in schedule 2 However, schedule 1 is view equivalent to schedule 3, because the values of account A and B read by transaction T2 were produced by T1 in both schedules The concept of view equivalence leads to the concept of view serializability We say that a schedule S is view serializable if it is view equivalent to a serial schedule As an illustration, suppose that we augment schedule 7 with transaction T6 , and obtain schedule 9 in Figure 1512 Schedule 9 is view serializable Indeed, it is view equivalent to the serial schedule <T3 , T4 , T6 >, since the one read(Q) instruction reads the initial value of Q in both schedules, and T6 performs the nal write of Q in both schedules Every con ict-serializable schedule is also view serializable, but there are viewserializable schedules that are not con ict serializable Indeed, schedule 9 is not con ict serializable, since every pair of consecutive instructions con icts, and, thus, no swapping of instructions is possible Observe that, in schedule 9, transactions T4 and T6 perform write(Q) operations without having performed a read(Q) operation Writes of this sort are called blind writes Blind writes appear in any view-serializable schedule that is not con ict serializable T3 read(Q) write(Q) write(Q) Figure 1512 Schedule 9 a view-serializable schedule T4 write(Q) T6.