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Generating unique object ids


Is there any way to atomically create unique object IDs / object names
in openldap?

Our scenario:
Our customers get unique, but ugly identifiers which are created by a
mechanism not under our control.

Now we want to enable them to create alias names via web interface. As
this alias names are to be used for creation of web urls and email
adresses, they must be unique.

Now, how can I ensure in a bullet-proof way that an alias name is

Simply looking whether it exists before adding it to the directory is
not considered bullet-proof as there could be concurrent access by
several customers.

In SQL, I'd use transactions, but I never heard of transactions
existing in LDAP.


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