Is it a good practice use LDAP for auth in a public webapp beside the app DB?

Question

Internet app needs to be really secure. So LDAP for auth got into the game. Instead doing the traditional db with users table, we want to authenticate agains a LDAP server. How good/bad you think it is ?

Answer 1

In principle, there is no fundamental difference in security between a "normal" DB and LDAP if implemented with equal care. However, there will be no benefit when compared to a DB if you use it to authenticate just a single app. The main advantage of LDAP as a user database is that you can use the same users in many different contexts and it can easily fit into a hierarchical model in an enterprise, which is difficult to achieve with a classic database.

What benefit would you expect from LDAP?