Types of Performance Testing

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Load Testing
Load testing is a type of performance test where the application is tested for its performance on normal and peak usage. Performance of an application is checked with respect to its response to the user request, its ability to respond consistently within accepted tolerance on different user loads.
The key considerations are:
  1. What is the max load the application is able to hold before the application starts behaving unexpectedly?
  2. How much data the Database is able to handle before system slowness or the crash is observed?
  3. Are there any network related issues to be addressed?
Stress Testing
Stress testing is the test to find the ways to break the system. The test also gives the idea for the maximum load the system can hold.
Generally Stress testing has incremental approach where the load is increased gradually. The test is started with good load for which application has been already tested. Then slowly more load is added to stress the system and the point when we start seeing servers not responding to the requests is considered as a break point.
During this test all the functionality of the application are tested under heavy load and on back-end these functionality might be running complex queries, handling data, etc.
The following questions are to be addressed:
  • What is the max load a system can sustain before it breaks down?
  • How is the system break down?
  • Is the system able to recover once it’s crashed?
  • In how many ways system can break and which are the weak node while handling the unexpected load?
Volume Testing
Volume test is to verify the performance of the application is not affected by volume of data that is being handled by the application. Hence to execute Volume Test generally huge volume of data is entered into the database. This test can be incremental or steady test. In the incremental test volume of data is increased gradually.
Generally with the application usage, the database size grows and it is necessary to test the application against heavy Database.  A good example of this could be a website of a new school or college having small data to store initially but after 5-10 years the data stores in database of website is much more.
The most common recommendation of this test is tuning of DB queries which access the Database for data. In some cases the response of DB queries is high for big database, so it needs to be rewritten in a different way or index, joints etc need to be included.
Capacity Testing
=> Is the application capable of meeting business volume under both normal and peak load conditions?
Capacity testing is generally done for future prospects.  Capacity testing addresses the following:
  1. Will the application able to support the future load?
  2. Is the environment capable to stand for upcoming increased load?
  3. What are the additional resources required to make environment capable enough?
Capacity testing is used to determine how many users and/or transactions a given web application will support and still meet performance. During this testing resources such as processor capacity, network bandwidth, memory usage, disk capacity, etc. are considered and altered to meet the goal.
Online Banking is a perfect example of where capacity testing could play a major part.

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