How to set up your FortiWeb : Auto-learning : Pausing auto-learning for a URL
 
Pausing auto-learning for a URL
Dynamic URLs that you have not configured to be interpreted by a URL replacer cause:
reduced performance
a tree that contains many URLs that are actually forms of the same URL
auto-learning data that is split among each observed permutation of the dynamic URL
To solve these problems, stop auto-learning for those URLs (right-click them in the auto-learning report and select Stop Learning), then configure a URL replacer. For details, see “How to adapt auto-learning to dynamic URLs & unusual parameters”.
If you decide later that the URLs were not, in fact, dynamic, you can resume auto-learning: right-click the URL in the auto-learning report, then select Start Learning. Otherwise, for dynamic URLs, you can delete split auto-learning data (see “Removing old auto-learning data”).
See also
Viewing auto-learning reports
How to adapt auto-learning to dynamic URLs & unusual parameters
Removing old auto-learning data