entryUSNoperational attribute on the entry; the
entryUSN, then, shows the number for the most recent change on any entry.
entryUSNattribute increments only with operations performed by LDAP clients. It does not count internal operations.
entryUSNis unique per back end database instance, so entries in other databases may have the same USN. The
nsslapd-entryusn-globalparameter changes the assignment of USNs from local to global, that is, from being counted on a single database to being counted for all databases in the topology. The parameter is turned off by default.
lastusn, is kept in the root DSE entry, which shows the most recently- assigned USN. In local mode,
lastusnshows the most recently- assigned USN per back end database. In global mode,
lastusnshows the most recently assigned USN for the entire topology.
|Multi- or Single-Valued||Single-valued|
|Defined in||Directory Server|