Trigger re-read(or update) of (System)App database System apps or apps in general are capable of storing information within a database. My problem is now: for example the Launcher app does store settings like the amount of apps and their position on the homescreen, widgets etc. into a database on the data partition.

These settings are usually just read from the database again even if there is a new Launcher app replacement with different settings for the homescreen.

My question is now: Is there any method(via shell) to trigger an update or re-read of this apps database, so that the new values from the new Launcher replacement are taken into account without just deleting the whole database or messing around with the current database?
Just to archive the right answer from Andrew's comment:  


  Then, as long as the database file is there, the app will read it when
  it needs to read it. There is no need to force read/update from
  outside (well, I'm not even sure if it's possible). It should be
  controlled within the app itself. Apologize if I still couldn't grasp
  the idea, maybe other readers might have solution for this.


I was confused about how these databases are handled. It is exactly as Andrew wrote: It depends on the actual implementation when and how the database is re-read.