MediaMonkey provides a number of facilities to help you manage your Library as it grows in size. For details see:
Updating the Library , for information about using the File Monitor to automatically update your Library when Tracks are added, moved, or changed or how to do perform updates manually.
Maintaining the Library, for information about how to prune and optimize the Library, and manually locate missing Tracks.
Clearing the Library, for information about emptying the Library of its contents.