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In this example, three users have been authenticated The first user has been authenticated only, and the second two users have been authenticated and authorized You can see the source address of the user as well as the resource that she has been authorized to access CTP authorization is discussed in the next section If you want to force an authenticated user to re-authenticate, use the following clear command:

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We need to continue to focus on the Company s business objectives Our focus is on profitable revenue growth We want you to share in the results of increasing our profits by negotiating better pricing

ciscoasa# clear uauth [username]

after a crash, these data must be restored Therefore, it is necessary to log not only changes to the database, but also changes to internal system data pertaining to longduration transactions Logging of updates is made more complex when certain types of data items exist in the database A data item may be a CAD design, text of a document, or another form of composite design Such data items are physically large Thus, storing both the old and new values of the data item in a log record is undesirable There are two approaches to reducing the overhead of ensuring the recoverability of large data items: Operation logging Only the operation performed on the data item and the data-item name are stored in the log Operation logging is also called logical logging For each operation, an inverse operation must exist We perform undo using the inverse operation, and redo using the operation itself Recovery through operation logging is more dif cult, since redo and undo are not idempotent Further, using logical logging for an operation that updates multiple pages is greatly complicated by the fact that some, but not all, of the updated pages may have been written to the disk, so it is hard to apply either the redo or the undo of the operation on the disk image during recovery Using physical redo logging and logical undo logging, as described in Section 179, provides the concurrency bene ts of logical logging while avoiding the above pitfalls Logging and shadow paging Logging is used for modi cations to small data items, but large data items are made recoverable via a shadow-page technique (see Section 175) When we use shadowing, only those pages that are actually modi ed need to be stored in duplicate Regardless of the technique used, the complexities introduced by long-duration transactions and large data items complicate the recovery process Thus, it is desirable to allow certain noncritical data to be exempt from logging, and to rely instead on of ine backups and human intervention.

There are two main problems with CTP authentication: Users need to access multiple internal devices, but with CTP authentication, the user would have to authenticate to each individual device CTP authentication is global: once a user authenticates, he can access the requested service; in other words, you can t control who accesses what service

Recall from Section 198 that a multidatabase system creates the illusion of logical database integration, in a heterogeneous database system where the local database systems may employ different logical data models and data-de nition and datamanipulation languages, and may differ in their concurrency-control and transaction-management mechanisms A multidatabase system supports two types of transactions: 1 Local transactions These transactions are executed by each local database system outside of the multidatabase system s control 2 Global transactions These transactions are executed under the multidatabase system s control

The McGraw Hill Companies, 2001

The following sections will discuss how CTP with authorization can solve these problems SECURITY ALERT! If an authenticated user is behind a PAT translation device, all users that are mapped to the same address are authenticated In this situation, I would highly recommend that you keep the idle timer to a small value, and also configure an absolute timer, forcing the user to periodically re-authenticate

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