As we know that in order to connect WP with database we should to define mysql username and password in wp-config.php, so at that point i have a question regarding security or ( some sort of connecting error ):
it is good practice using same mysql user with many databases
one thing is that i haven't seen any trouble regarding this but was thinking someday it will come :) hope you understand
well thanks in advance
Well it's really not good practise, but this depends on how you're accessing the other databases.
For example, I have a server that hosts 10+ different Wordpress sites.
I have two options for connecting to the databases:
Number 1 is useful when I'm developing locally/on a virtual machine as the databases aren't accessible to the outside world.
Number 2 is definitely the best practise when you're running a live server with multiple databases. At most if your password does get compromised you're only exposing one database.
