> sure?
> how be sure to have a real coherent directory all the time?

Forgot this one.  The answer is you don't.  Directories can be inconsistant.  There is 
nothing in the specifications (LDAP RFC's) I know of regarding the maintence of 
integrity other then atomic operations on entries and syntax checking.

Referential integrety is not maintained by the directory it must be managed by the 
application.

However it can be managed by a directory if it has triggers and stored procs.  But 
again this is a little different from the transaction concept.  There really is no 
2-phase commit guaranttees by the LDAP protocol for operations so if the server goes 
down during a mass series of updates then yes it could find itself in an inconsistant 
state.

Alex


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