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8.8

A Causal analysis - Slow application over WAN link

Asked by fahim in Access Architecture/Design, Software/Systems Design, Oracle Database, Network Design & Methodology, Active Server Pages (ASP)

Tags: WAN links, application performance

Hi
There is a need to identify all the causes that have the potential to impact the performance of an applications built upon ASp.Net / Forms / VB etc using oracle 9i at the backend. The user facing clients are thick and not web based.

Consider two offices, main and branch located across 250 kms from each other connected via 10MB dedicated WAN link provided by our ISP. The underlying technology of this link is not known but chances are it's MPLS but without CoS aspects.

Application/DB servers are hosted in Main Datacenter. Ping to the servers returns a reply of <1ms. Over 1500 users are accessing application and generating required reports off this application, just fine.

Over to branch office. Link utilisation about a max of 50% at peak times. Ping reply to the app serves hosted at main datacenter return an average of 7ms. Reports generation at the branch are abysmally slow. A report which takes 5 secs at main is taking almost 15 secs at branch.

We cannot host the application/db instance at the branch to improve the performance due to manpower unavailability to maintain and administer the application(s). Reports off all the applications are coming out to be slow and its not one application specific.

While the report is being generated, Task Manager shows up that particular application associated Task going into a Not responding state only to return to the running state after a long delay when the required window/report opens up.

What could be the causes? Where /How should I start investigation?
[+][-]08/11/09 11:38 AM, ID: 25071969Expert Comment

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About this solution

Zones: Access Architecture/Design, Software/Systems Design, Oracle Database, Network Design & Methodology, Active Server Pages (ASP)
Tags: WAN links, application performance
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Solution Provided By: Volox
Participating Experts: 6
Solution Grade: A
 
 
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