The different between factory, config_dg, and resources_db

Question

I found it sometimes confuse. I will appreciate if someone could clarify the different between factory, config_dg, and resources_db

Answer 1

• UVM Factory is a standardized mechanism to create different objects. It has only one object in the entire simulation space. It has various methods to create different uvm_component or uvm_object instances and also to override it.
• uvm_resource_db is the parent class of uvm_config_db, which is used to set different values in the registry and then get it. uvm_resource_db has 2 lookup arguments for this set-get mechanism, whereas uvm_config_db has 3 lookup argument. Please go through https://verificationacademy.com/forums/uvm/what-difference-between-uvmconfigdb-and-uvmresourcedb