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Timestamp-based protocols Timestamp protocols never require a transaction to wait However, they do require transactions to abort under certain circumstances If a long-duration transaction is aborted, a substantial amount of work is lost For noninteractive transactions, this lost work is a performance issue For interactive transactions, the issue is also one of user satisfaction It is highly undesirable for a user to nd that several hours worth of work have been undone Validation protocols Like timestamp-based protocols, validation protocols enforce serializability by means of transaction abort Thus, it appears that the enforcement of serializability results in long-duration waits, in abort of long-duration transactions, or in both There are theoretical results, cited in the bibliographical notes, that substantiate this conclusion Further dif culties with the enforcement of serializability arise when we consider recovery issues We previously discussed the problem of cascading rollback, in which the abort of a transaction may lead to the abort of other transactions This phenomenon is undesirable, particularly for long-duration transactions If locking is used, exclusive locks must be held until the end of the transaction, if cascading rollback is to be avoided This holding of exclusive locks, however, increases the length of transaction waiting time Thus, it appears that the enforcement of transaction atomicity must either lead to an increased probability of long-duration waits or create a possibility of cascading rollback These considerations are the basis for the alternative concepts of correctness of concurrent executions and transaction recovery that we consider in the remainder of this section

Unlike the PIX security appliances, which were originally designed on a PC-/serverbased Intel architecture, the ASAs are designed on a proprietary hardware architecture A few reasons are behind this change in philosophy: Because the PIXs are based on an Intel PC/server architecture, it is possible to build your own box and run Cisco s software on this (even though this is illegal) Cisco wants to make sure that you run only their software on their hardware; therefore, the ASAs hardware has been customized to address this and other issues Using a generic motherboard limits the capabilities of the appliances By custom designing the ASAs, Cisco has created a much more flexible, faster, and more capable product

The fundamental goal of database concurrency control is to ensure that concurrent execution of transactions does not result in a loss of database consistency The concept of serializability can be used to achieve this goal, since all serializable schedules preserve consistency of the database However, not all schedules that preserve consistency of the database are serializable For an example, consider again a bank database consisting of two accounts A and B, with the consistency requirement that the sum A + B be preserved Although the schedule of Figure 245 is not con ict serializable, it nevertheless preserves the sum of A + B It also illustrates two important points about the concept of correctness without serializability Correctness depends on the speci c consistency constraints for the database Correctness depends on the properties of operations performed by each transaction In general it is not possible to perform an automatic analysis of low-level operations by transactions and check their effect on database consistency constraints However, there are simpler techniques One is to use the database consistency constraints as

The remainder of this section will provide an overview of the ASA models NOTE Since the PIXs are end-of-sale (EOS), their architecture and capabilities are not discussed in this book Suffice it to say, however, that the ASAs by far outperform the PIXs and have more capacity than the PIXs Likewise, the ASAs are the replacement of the Cisco VPN 3000 concentrators, which are also EOS

The McGraw Hill Companies, 2001

In some circumstances, you may want to authenticate connections through the appliance itself You might have a situation where using an ACL doesn t provide enough security Remember that ACLs, discussed in 6, can only look at the layer 3 and 4 information, which can easily be spoofed As an added security measure, you can use the appliance CTP feature, which provides application-layer authentication For example, you might have accounting users in a VLAN acquiring their addressing information via DHCP In the data center across the campus reside the accounting servers in their own VLAN If all you cared about was to restrict access from the accounting users to the accounting servers, you could easily accommodate this with an ACL However, suppose one restricted accounting server in the server farm should be accessed by only a handful of accounting users Since all the accounting users acquire their addressing information via DHCP, you really don t know what source IP address or addresses to allow to the restricted server To overcome this problem, you could statically assign the small set of users a range of addresses that are allowed, but that means you would have to manage static addresses On top of this, these addresses could be spoofed, allowing unauthorized people to access the restricted server Another solution would be to control access on the accounting server itself, which, in most cases, is what administrators do However, in some cases this might not be feasible, based on what the application on the server supports A third option is to

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