big problem with slapd

["Robin Walser, Datapark AG" <walser@datapark.ch>]

Hi List,

I discovered that when I try to add a new entry, the following error occurs:

ldap_add: Internal (implementation specific) error (80)
additional info: DN index generation failed

What happend here... My LDAP Database gots a large amount of data. The 
Backend I use is ldbm.

I searched the internet for this problem, I only find slapindex should 
help, but it didn't!

OpenLDAP Version: 2.2.7 on a Debian Sarge Machine

Please help! Thanks in Advance!

Robin