If the directory is used by many applications, you must use the sum of the applications' requirements to work out the actual requirement for the directory.
If you work out the requirement for an individual application only, the directory may not perform as required.
Example: Performance with Many Applications
The following diagram shows a single authentication directory that is currently used by two applications (online banking and car insurance).
In this example, the third application (share trading) is new, and the directory designer is currently checking the performance of the directory with this new application.
Even though the new application only requires the directory to respond to 100 operations per second, the directory is also servicing requests from the other applications.
This directory must be stress-tested under the full load of 1600 operations per second.
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