Volume Testing belongs to the group of non-functional tests, which are
often misunderstood and/or used interchangeably. Volume testing refers to
testing a software application for a certain data volume. This volume can in
generic terms be the database size or it could also be the size of an interface
file that is the subject of volume testing. For example, if you want to volume
test your application with a specific database size, you will explode your
database to that size and then test the application's performance on it.
example could be when there is a requirement for your application to interact
with an interface file (could be any file such as .dat, .xml); this interaction
could be reading and/or writing on to/from the file. You will create a sample
file of the size you want and then test the application's functionality with
that file to check performance.