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1. In the Data Source Explorer, locate and then click the Profiling Repository.

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   You access the profile repositories either in the Managed Data Sources node or in the Profiling Repositories.

   
   If the data source is not already connected, DB Optimizer connects to the Profiling Repository data source. 

2. To delete all sessions in the Profiling Repository, right-click Profiling Repository and then select Delete All.
   To delete a specific profiling session, expand the Profiling Repository and the data source containing the profiling session, and right-click the name of the profiling session, and then select Delete.
   The profiling session data is deleted, however, some information about the data source is retained in order to expedite future profiling on this data source. If you are certain you will not want to retain this information, right-click the Profiling Repository and then select Clean. 

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   You can also delete the profiling sessions saved to a repository by unregistering the repository. For more information see Specify Profile Repositories Preferences.