After adding a new ppa to the repository, is it necessary to update the whole database? By "whole database" I mean is it necessary to update index's of each and every packege?

If it's not necessary, then how can I update only that specific package whose ppa I have just added into the repository.

For example,

if I add an ppa by typing the following in terminal,

sudo add-apt-repository ppa:tiheum/equinox

then we normally run the following command after it,

sudo apt-get update

But how can I update the only package which is associated with the above ppa, instead of updating the whole database.