Updating root zone file
Right click on the server, some networks can have listed more DNS Servers, where you want to update the Root Hints to open the context menu and click on Properties.In the Properties window go to the Root Hints tab and click on Copy from Server.At the time of writing you’ll only need to scroll down a bit on the front page to find IPv4 address 220.127.116.11 from the a.DNS Server.Use this IP address or DNS name in the window Server to Copy From and click on OK.
From Oracle 11g R2 onward, new time zone files are shipped with upgrades and patches, but they are not automatically applied to the database.
Use the table below to find the scenario that's applicable to your situation and follow those instructions.
Note: If your domain is registered at another company, please click on the link below for the DNS record you'd like to add, change, or delete and follow the Domains registered at another company set of instructions at the bottom of that article.
To solve this we run the upgrade in the root container and all PDBs using the "catcon.pl" Perl script.
This example performs all the steps in all containers, without doing any investigation, and assumes everything will work with no additional intervention.