While it keeps your usable data intact, it removes corrupted files that may be slowing down the system. How to Install and Use

To clarify, the PKG file you're referring to is likely a package file used for installing or updating software on the PlayStation 3. Rebuilding the database on a PS3 can be helpful for resolving various system issues, but it's essential to proceed with caution and ensure you're using files from trusted sources to avoid any potential harm to your console.