Adobe ColdFusion 9 Web Application Construction Kit: by Ben Forta

By Ben Forta

Written by way of the easiest recognized and so much relied on identify within the ColdFusion group, Ben Forta, The ColdFusion net program development package is the best-selling ColdFusion sequence of all time. quantity three: complex software improvement, specializes in program safety, scalability and high-availability, and integration with different structures and applied sciences. The e-book starts off with sections devoted in particular to scalability and safeguard, after which occupied with extending ColdFusion purposes utilizing internet applied sciences, different languages and systems, and complicated integration innovations. whole assurance of ColdFusion nine is integrated in "Volume 1, Getting begun" (0-321-66034-X) and "Volume 2, software improvement" (0-321-67919-9).

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In general you want to make sure you cover these parameters in your test scripts: N Maximum number of users and/or sessions to simulate (if your Web site’s peak number of users is, say, 500 per hour, you may want to test it for 1,000 users per hour to ensure that your site will not crash during peak usage) N Length of sessions (each user stays on your site for an average of 5 minutes) N Length of the test (usually a minimum 1-hour test with at least a 20- to 30-minute “smoke” test before you start your real testing) N Ramp-up times (adding users and/or sessions gradually and sporadically to simulate real Web traffic) N Connection speed mix (majority of test users will access the site over a 56 Kbps connection; others will access over DSL or cable connections) Now it is time to prepare your Web site for the load test.

Or you can write an extensive ColdFusion page that performs a complete check on your application’s components. ColdFusion server probes offer you another great tool to monitor, inform, and even resolve issues as they happen. J\kk`e^ Lg X Jpjk\d GifY\ kf M\i`]p

Software-based load balancers communicate on the network level and maintain a heartbeat with other servers in the cluster to identify server health. If a server in the cluster fails to respond to the heartbeat, the server fails over—that is, traffic is redirected away from the affected server. A number of open source and free open source software load balancing solutions are available, especially for Linux (]iie/$$aX^X#dg\$adVYTWVaVcX^c\#]iba). However, software-based load balancing is usually only good for smaller systems, because at some point the software used to loadbalance a cluster may begin to affect the cluster’s performance.

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