ldap_add: Constraint violation (19) additional info: some attributes not unique

Question

Well I have already gone through ldap_add: Constraint violation (19) but couldn't solve my problem!

Problem I'm facing is that, when I'm trying to add users from  bckup.ldif file by issuing following command

ldapadd -x -D "dc=admin,dc=domain,dc=lcl -f bckup.ldif -W

It's throwing following error

adding new entry "uid=doctor.lcl,ou=People,dc=domain,dc=lcl"
ldap_add: Constraint violation (19)
    additional info: some attributes not unique

I took backup by using ldapsearch only not slapcat

So my question is What causing the error and How to resolve the error?

krisFR · Answer

It seems that one (or more) attribute for uid=doctor.lcl,ou=People,dc=domain,dc=lcl contains duplicate value with an already existing LDAP entry, for an attribute defined as unique.

First, check your slapd.conf to search for attributes marked as unique.
e.g :

# index since the unique overlay will search for matching mail attributes
index mail eq

overlay unique
unique_attributes mail

Then perform an ldap search on this (these) unique attribute(s) and find the one which is a duplicate with uid=doctor.lcl attributes.

ldap_add: Constraint violation (19) additional info: some attributes not unique

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