Primavera.CacheService.exe manages local cache databases for each P6 Professional Cloud Connect database you log in to and ensures that each local cache database is synchronized with the relevant Cloud Connect database.
When you open P6 Professional from the shortcut, Primavera.CacheService.exe runs and allows you to log in to and manage Cloud Connect database connections. When you log in to a Cloud Connect database, Primavera.CacheService.exe starts P6 Professional and then minimizes, but continues to run in the status tray. When you connect to a P6 Professional Cloud Connect database, Primavera.CacheService.exe continues to run even after you close P6 Professional so that the service can continue to synchronize the local cache databases with the relevant Cloud Connect databases.
If you most recently logged into a Cloud Connect alias, Primavera.CacheService.exe continues to run as a status tray application after P6 Professional exits. This allows the cache service to continue synchronizing the local cache databases with Cloud Connect databases, so that P6 Professional starts more quickly the next time you connect. If the Primavera.CacheService.exe is running in the status tray, you can right click on it and select Start P6 Professional to restart P6 Professional. You can maximize Primavera.CacheService.exe at any time by right-clicking on the icon in the status tray and selecting Show.