What is LDAP#LDAP or Lightweight Directory Access Protocol is a set of LDAP Protocol Exchanges that defines the method by which data is accessed.
Finally, it defines how data is loaded into (imported) and saved from (exported) a directory service (using LDIF). LDAP does not define how data is stored or manipulated. Data Store is an 'automagic' process as far as the standard is concerned.
For another good over view of LDAP try http://www.zytrax.com/books/ldap/ NOTE: Even if you are using eDirectory vs OpenLDAP as referenced in the article, but most of the the LDAP references should be valid across LDAP Server Implementations.LDAP Message is transmitted on the wire as an single integer which is one of the reasons LDAP is "Lightweight". Comparing LDAP and SQL is a common discussion, it is really comparing Apples and Oranges.