Harry Lei
Harry Lei
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  • San Mateo, CA
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How did you find FindVirtual.com?
Software, QA, Outsourcing, Service, hlei@360logica.com, development, automation, white box, offshore
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http://www.360logica.com
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Harry Lei's Blog

Harry Lei

J2EE application performance QA and tuning (4) - Database Side



My query was fine last week and now it is slow. Why?

The likely cause of this is because the execution plan has changed. Generate a current explain plan of the offending query and compare it to

a previous one that was taken when the query was performing well.

Usually the previous plan is not available.

Some factors that can cause a plan to change…

Continue

Posted on September 17, 2010 at 1:43pm

Harry Lei

J2EE application performance QA and tuning (3)



http://www.ddjembedded.com/resources/articles/2001/0112g/0112g.htm

Balancing Network Load with Priority Queues Tips:
  • Hardware traffic managers redirect user requests to a farm of servers based on server availability, IP address, or port number. All traffic is routed

    to the load balancer, then requests are fanned out to servers based on

    the balancing…
Continue

Posted on September 14, 2010 at 12:26am

Harry Lei

J2EE application performance QA and tuning (1)



To start J2EE application performance QA and tuning:

  • Set a goal: Before you begin tuning your J2EE application's performance, set a goal. Often this goal addresses the maximum concurrent

    users the application will support for a given limit on

    response times. But the goal can also focus on other variables—for

    example, the response times should not increase

    more than 10 percent during the peak hour of user…
Continue

Posted on August 24, 2010 at 1:03pm

Harry Lei

How can it be determined if a test environment is appropriate?

This is a difficult question in that it typically involves tradeoffs between 'better' test environments and cost. The ultimate situation would be a collection of test environments that mimic exactly all possible hardware, software, network, data, and usage characteristics of the expected live environments in which the software will be used. For many software applications, this would involve a nearly infinite number of variations, and would clearly be impossible. And for new software… Continue

Posted on August 16, 2010 at 1:13am

Harry Lei

What if an organization is growing so fast that fixed QA processes are impossible?

This is a common problem in the software industry, especially in new technology areas. There is generally no easy solution in this situation. One approach is:

  • Hire good people
  • Management should 'ruthlessly prioritize' quality issues and maintain focus on the customer
  • Everyone in the organization should be clear on what 'quality' means to the customer
Depending on the growth rate, it is… Continue

Posted on August 2, 2010 at 11:30pm

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