We offer Load, Stress and Capacity Testing services to performance test Web, Application and Database servers. We create realistic models simulating different business environments and provide a repository of information to easily analyze and report results throughout application development process.

To Load test, we measure server response times to verify if the application can sustain expected maximum number of concurrent users and expected maximum size of the database.

To Stress test, we measure server response times at varying loads starting from low load (low number of concurrent users), medium load (average number of concurrent users) through high load (expected maximum number of concurrent users through highest possible number of concurrent users until unacceptable levels of response times are experienced) to validate application's stability and validity. Response times are also measured while varying the size of the databases in similar manner.

To Capacity test, we test to determine the maximum number of concurrent users an application can manage without compromising response time.

We record, analyze and report several time metrics during the testing - Connect time, Send Time, Process Time, Transaction time, Receive Time, Response Time, and Round Time. Server hardware resources (cache, memory, CPU, network) usage is tracked to find if any of the hardware elements are causing slowdown.

We use Code Profilers to find ways to optimize the code (pool classes, tune heaps, identify bottleneck causing classes). Cost of running every piece of SQL in the application are measured for database optimization through creation of indexes and/or rebuilding of the SQL statements.

ZenQA has expertise in the usage of various load test tools from Rational (Purify, Robot, PerformanceTester), Radview (WebLoad), Mercury (LoadRunner) and Open Source. For code optimization, we have expertise in industry standard Code Profilers (for .Net and Java - Applets, Servlets and components).