I know that LDAP is used to provide some information and to help facilitate authorization.
But what are the other usages of LDAP?
LDAP is just a protocol to access structured information. LDAP has standardized local and remote access to information whereas in case of database there is only standardized local access and remote access is proprietary.
LDAP server is optimized for search operation and database for transactions(Insert/Delete).
For more information refer following link:
http://www.itszero.in/2013/09/what-is-ldap-ad-adam.html