We recently had two cases where it would have made sense to automatically recreate (certain) LDAP indexes when updating LDAP schemas. Case 1) concerned an OID collision and case 2) concerned a change in the object class hierarchies. In both cases, incorrect search results can be expected after the LDAP schemes have been adapted. This then applies to all UCS-DCs that have to rebuild their indexes almost simultaneously (during/after schema replication). Please note that the slapd must be switched off when reindexing and that the availability of executable LDAP servers in the domain could then become a problem if all system update their indexes "simultaneously".