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Figure 14-2. In a client/server architecture, each end user has a dedicated database connection corresponding to a database user account. As shown in Figure 14-2, the end user Tony Davis authenticates himself using the database account tdavis. Once authenticated, Tony remains connected to the database for the entire duration of his interaction with the application. This has the following implications on the security and performance of the application Tony is using: Security: In terms of security, the database simply identifies Tony once in the beginning. As long as the dedicated network connection from Tony s client machine to the database server is secure, this is a safe approach.

Adds a DOM event handler to the DOM element; also aliased by the $addHandler shortcut Adds a list of DOM event handlers to the DOM element; also aliased by the $addHandlers shortcut. Removes all DOM event handlers from the DOM element that were added through the addHandler or the addHandlers methods; also aliased by the $clearHandlers shortcut Prevents the default DOM event from executing Removes a DOM event handler from the DOM element that exposes the event; also aliased by the $removeHandler shortcut Stops the propagation of an event to its parent elements

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Performance/scalability: Since this connection is dedicated to Tony, the resources associated with the connection can t be used by anyone else until Tony logs off or his connection times out. Moreover, the connection has to be established and torn down each time Tony logs into or out of the application. If you increase the connection timeout period, there will be more idle time for the connection, resulting in more wasted resources. On the other hand, if you reduce the connection timeout, Tony would see performance problems associated with connection creation and destruction overhead that occurs after each timeout. Thus, the idea of dedicating one connection for one user for the lifetime of an application session can be a significant scalability inhibitor when we deal with a large number of users.

With the advent of web applications, application servers mediate the interaction between the application and the database. Typically, a web application client uses the HTTP protocol to connect to an application server containing the middle-tier business logic. The application server in turn connects to the database to perform various functions. If we create a separate database account for each end user and maintain a dedicated connection, we run into two problems: Performance: The number of users in a large web application can easily run into the thousands (or more). Maintaining a dedicated connection for each user for the duration of one application session can rapidly exhaust the computing resources (memory and CPU) at the database and application server levels. It can also result in very poor usage of connection resources. Security: Maintaining separate database accounts for each user means that the application may have to know and maintain the database password of each user. This can result in password-management issues. In this chapter, we will focus on tackling the performance issues just outlined using connection pooling. In the next chapter, we will examine how we can use proxy authentication to solve the security problem while maintaining good performance.

In the previous script sample, you saw how to move a panel around the screen with client-side only code using the methods of the Sys.UI.DomElement class. In that example, the function name was set to the onclick attribute of the button as is often done in classic JavaScript. We could just as easily use the addHandler method to wire up the click event of the button to the desired function. The addHandler method has three required parameters: the target element, the name of the event, and the event handler. So in the case of the previous sample, we would have

To quantify the cost of establishing and tearing down a database connection, I wrote a simple program. The following program, CostOfConnection, extends the JBenchmark class (explained in the section Timing Java Programs of 1) to time the process of creating and closing a connection. First, we import the necessary classes and declare the requisite variables: /** This program times the process of establishing and closing a connection. * COMPATIBLITY NOTE: runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.Connection;

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