They take a long time if you have to rebuild the indexes, which is what you have to do if you only have a text dump. For MySQL, using the standard format (MyIS

They take a long time if you have to rebuild the indexes, which is what you have to do if you only have a text dump. For MySQL, using the standard format (MyISAM), you can just do a file copy if you bothered to do a proper backup of the binary files.