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Subtasks An interactive transaction may consist of a set of subtasks initiated by the user The user may wish to abort a subtask without necessarily causing the entire transaction to abort Recoverability It is unacceptable to abort a long-duration interactive transaction because of a system crash The active transaction must be recovered to a state that existed shortly before the crash so that relatively little human work is lost Performance Good performance in an interactive transaction system is de ned as fast response time This de nition is in contrast to that in a noninteractive system, in which high throughput (number of transactions per second) is the goal Systems with high throughput make ef cient use of system resources However, in the case of interactive transactions, the most costly resource is the user If the ef ciency and satisfaction of the user is to be optimized, response time should be fast (from a human perspective) In those cases where a task takes a long time, response time should be predictable (that is, the variance in response times should be low), so that users can manage their time well In Sections 2451 through 2455, we shall see why these ve properties are incompatible with the techniques presented thus far, and shall discuss how those techniques can be modi ed to accommodate long-duration interactive transactions

1:

The properties that we discussed make it impractical to enforce the requirement used in earlier chapters that only serializable schedules be permitted Each of the concurrency-control protocols of 16 has adverse effects on long-duration transactions: Two-phase locking When a lock cannot be granted, the transaction requesting the lock is forced to wait for the data item in question to be unlocked The duration of this wait is proportional to the duration of the transaction holding the lock If the data item is locked by a short-duration transaction, we expect that the waiting time will be short (except in case of deadlock or extraordinary system load) However, if the data item is locked by a long-duration transaction, the wait will be of long duration Long waiting times lead to both longer response time and an increased chance of deadlock Graph-based protocols Graph-based protocols allow for locks to be released earlier than under the two-phase locking protocols, and they prevent deadlock However, they impose an ordering on the data items Transactions must lock data items in a manner consistent with this ordering As a result, a transaction may have to lock more data than it needs Furthermore, a transaction must hold a lock until there is no chance that the lock will be needed again Thus, long-duration lock waits are likely to occur

IP spoofing, where the source address has been changed, can be detected and prevented using ACLs However, Cisco supports a feature called Reverse Path Forwarding (RPF) that provides a more efficient process, where the appliance does a reverse-route lookup examines the source address and compares it with the routing table entries to determine if the source address is coming from an interface it is expected to be connected to Network attack prevention features are discussed in more depth in 24

The McGraw Hill Companies, 2001

The ASAs are one of Cisco s newer security products, introduced in May 2005 along with the version 70 operating system update The ASA 5510, 5520, and 5540 were the first ASAs Since then, three new models were added to the product line the 5505, 5550, and 5580 and four revisions of the software have been introduced version 71, 72, 80, and 81 The following sections will discuss the ASA models you can purchase as well as the licensing method Cisco uses to control the features that are activated on the security appliances NOTE As of the writing of this book, the ASA 5580s support 81 the remainder of the ASA and PIX security appliances support up to 80

24

Each company will have its own unique time line for its sales compensation communication effort Start by identifying the most important date the announcement to the sales force and work backwards While effective communication theory recommends making the announcement prior to the plan effective date, most sales executives prefer to announce the new program after the old program has expired so as not to distract sales personnel during the final weeks of the fiscal year For example, for fiscal years ending December 31st, the new sales compensation program will become effective January 1st Plan the roll-out of the new sales compensation program to occur after January 1st, and as late as the second or third week of January