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When you discuss use-cases and requirements with a customer, as long as a Web front end is involved, AJAX capabilities are an obvious part of the deal I foresee in the near future a scenario where we have two approaches to Web development: an evolved ASPNET-based platform for server-side development using a classic programming language, and an ad hoc platform for JavaScript-intensive applications In both cases, the client has to be rich and capable of placing requests asynchronously While waiting for such an exciting future, let s focus on what we have today for building a rich user interface for the Web If AJAX is possible in Web Forms, it has to be possible in ASPNET MVC too and in a similar way All solutions for AJAX that work in an ASPNET Web Forms application can be successfully employed in an ASPNET MVC application.

Many performance counters are available for the Mailbox server; the storage-based counters listed in Table 17-1 are a good starting place when collecting performance data.

MSExchange Database\ I/O Database Reads (Attached) Average Latency MSExchange Database\ I/O Database Reads (Recovery) Average Latency Database\Database Page Fault Stalls\sec

In addition, ASPNET MVC offers a bunch of HTML helpers optimized for offering certain AJAX functions at a very low cost for the developer Overall, the best service that ASPNET MVC offers in an AJAX context is the total control over HTML (and subsequently, JavaScript) that it provides regardless of the view engine of choice In this chapter, I ll first review the theme of AJAX programming in ASPNET as a platform Then I ll focus on the specific AJAX capabilities of the ASPNET MVC framework..

Shows the average time for reading data from the active database file. Shows the average time for reading data from passive database file. Shows the rate of page faults that cannot be serviced because no pages are available for allocation from the database cache.

The active copy on average should be below 20 ms. Spikes should not exceed 100 ms. Passive copies on average should be below 200 ms. Spikes should not exceed 1,000 ms. Should be 0. Values above 0 indicate database write average latency is too high.

When collecting performance data for the Mailbox server, the focus is generally on storage response times. Slow response times will directly impact the user experience and passive copy replay. If the disk subsystem is not meeting demand, fixing the problem may require additional disks, faster disks, or modifying the disk configuration. Table 17-2 shows the Information Store RPC processing counters. If RPC counters indicate a problem, several causes are possible.

The AJAX development model revolves around one common software element the XMLHttpRequest object. The availability of this object in most browsers object models is the key to the current ubiquity and success of AJAX applications. The XMLHttpRequest object allows script code to send HTTP requests and handle their responses. With XMLHttpRequest, developers directly control the placement and outcome of the request. The actual mechanics

Network components Check network card settings for errors, dropped packets,

This code is very similar to the rendering code that was used in the examples in 8. In fact, we can reduce this code to only the new code required for an effect, as shown here:

Indicated the overall RPC requests that are currently executing within the store process. Shows the RPC latency, in milliseconds, averaged for all operations in the last 1,024 packets. Shows a server RPC latency in milliseconds averaged for the past 1,024 packets for a specific client protocol. The value of Other is used for MAPI clients.

The key counters for transport center on queues. Monitoring transport queues ensures timely message delivery.