Database links creation date changed

Hi team,

 

A few days ago, I changed the sys and system account passwords in our production EBS 12.1.3 database (12.1.0.2).

I have managed that like this:

First, I shut down the apps tier, then shut down the database tier. 

Then I changed the sys password, then the startup database, and changed the system password.

I have executed auto config on the database tier.

I've executed auto config on the apps tier, then I started the apps tier.

After those actions, I noticed that the creation dates of DB links EDW_APPS_TO_WH and APPS_TO_APPS had changed to the exact date when I did those steps.