Often we come across the situation, when it is difficult to run a system update, like in production. But still we need to apply some modification at an attribute level.
Hybris has provided Hybirs management console (HMC) , as a graphical tool, which mirrors database in a user friendly way.
Go to HMC > system > type > Search for your item type > Properties.
Here you can apply all sort of modifications you want to do. You can set default values, initial values, mandatory nature etc.