[Dovecot] Multiple userdb possible?

Hello,

I am running v2.0.13. In my dovecot.conf I have:

userdb { args = /etc/dovecot/dovecot-usrdb-ldap.conf driver = ldap }

passdb { args = /etc/dovecot/dovecot-passdb-ldap.conf driver = ldap }

Is it legitimate to include multiple ldap userdb's, like:

userdb { args = /etc/dovecot/dovecot-usrdb-ldap1.conf driver = ldap }

passdb { args = /etc/dovecot/dovecot-passdb-ldap1.conf driver = ldap }

userdb { args = /etc/dovecot/dovecot-usrdb-ldap2.conf driver = ldap }

passdb { args = /etc/dovecot/dovecot-passdb-ldap2.conf driver = ldap }

If it is legitimate (in case configuration is different, please correct me), in which sequence userdb's are evaluated?

Thanks, Nick