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Using the Kerberos protocol offers several advantages and disadvantages The advantages include the following: Mutual authentication: Kerberos provides a simple mechanism for mutual authentication As you saw in the previous pages, the server just needs to encrypt the time stamp included in the client authenticator and send it back as a proof of its identity When the client receives the message and decrypts it with the session key, it can easily validate whether the service is who it claims to be Improved performance: The identity of the client only needs to be verified once during the duration of the session After the TGT is generated, the client no longer needs to access the authentication service Integration with Windows: If your organization already relies on Active Directory you can benefit from this existing infrastructure and implement a protocol that benefits from the impersonation, delegation, authorization, and audit capabilities provided by Windows.

Most applications also have some very non-interactive processes, such as posting invoices, relieving inventory, or calculating insurance rates Ideally, the Business layer will be used in a very rich and interactive way when the user is entering data directly into the application For instance, when a user is entering a sales order, she expects that the validation of data, the calculation of tax, and the subtotaling of the order will happen literally as she types This implies that the Business layer can be physically deployed on the client workstation or on the web server to provide the high levels of interactivity users desire To support non-interactive processes, on the other hand, the Business layer often needs to be deployed onto an application server, or as close to the database server as possible.

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sqlite3BtreeRollback: Rolls back the current transaction. sqlite3BtreeBeginStmt: Starts a statement transaction. sqlite3BtreeCommitStmt: Commits a statement transaction. sqlite3BtreeRollbackStmtsqlite3BtreeRollbackStmt: Rolls back a statement transaction.

For instance, the calculation of an insurance rate can involve extensive database lookups along with quite a bit of complex business processing This is the kind of thing that should occur behind the scenes on a server, not on a user s desktop Fortunately, it is possible to deploy a logical layer on multiple physical tiers Doing this does require some up-front planning and technical design, as you ll see in 2 The end result, however, is a single Business layer that is potentially deployed both on the client workstation (or web server) and on the application server This allows the application to provide high levels of interactivity when the user is working directly with the application and to provide efficient back-end processing for non-interactive processes..

Interoperability: Kerberos is a protocol that has been adopted by other important players in the IT industry, so you don t have to worry about being limited using it within a Windows domain SSO: The fact that Kerberos is based on security tokens makes it an ideal candidate for SSO scenarios The user only needs to provide its credentials once at the beginning of a session, and a TGT can be used to provide multiple session tickets to access different network resources The main disadvantages of using the Kerberos protocol include the following: Requires additional infrastructure: If your organization does not use Active Directory, you will need to incur the additional expense of setting it up You will also need to consider the investment for maintaining an Active Directory implementation.

Data access code interacts with the Data Storage and Management layer to retrieve, insert, update, and remove information. The Data Access layer doesn t actually manage or store the data; it merely provides an interface between the business logic and the database. Data access gets its own logical layer for much the same reason that the interface is split from interface control. In some cases, data access will occur on a machine that s physically separate from the one on which the interface and/or business logic is running. In other cases, data access code will run on the same machine as the business logic (or even the interface) in order to improve performance or fault tolerance.

Table management routines include the following: sqlite3BtreeCreateTable: Creates a new, empty B-tree in a database file. Flags in the argument determine whether to use a table format (B+tree) or index format (B-tree). sqlite3BtreeDropTable: Destroys a B-tree in a database file. sqlite3BtreeClearTable: Removes all data from a B-tree but keeps the B-tree intact.

Note It may sound odd to say that putting the Data Access layer on the same machine as the business logic can increase fault tolerance, but consider the case of web farms, in which each web server is identical to all the others. Putting the data access code on the web servers provides automatic redundancy of the Data Access layer along with the Business and Interface layers.

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