In reply to desaivs1994:
The first and the second argument are Building the context. ‘this’ menas always a relative path, relative to the component where you are executing the corresponding command. If you want to Limit the Access to a certain component you can do this through the second Argument. In your case only blocks with the name ‘m_ahb_agent’ can retrieve the data. If you do not want to Limit this, use the wildcard ‘*’. uvm_config_db is also supporting globbing.