Thanks for the reply.
The OpenLDAP version is 2.4.35.
For the backend, I'm not really sure where to look at, but I found the
attribute olcDbDirectory in the olcDatabase={1}mdb,cn=config entry. It
points at the folder /custom/data/openldap-data-oldschema, where I saw
two .mdb files (lock.mdb and data.mdb).
Is it possible that this two MSAccess (?) files are my OpenLDAP backend ?
It is running over a Red Hat 6 system.
I did an ldapsearch and a slapcat and both of then returned all entries.
When I use the Java unboundID framework, if I do a "large" search, some
entries doesn't show up, but if I do a specific search, the missing entry
is found. Both queries were made par the same framework method...