.BR bdb ,
.BR config ,
.BR dnssrv ,
+.BR hdb ,
.BR ldap ,
.BR ldbm ,
.BR ldif ,
.BR bdb ,
.BR config ,
.BR dnssrv ,
+.BR hdb ,
.BR ldap ,
.BR ldbm ,
.BR ldif ,
It serves up referrals based upon SRV resource records held in the
Domain Name System.
.TP
+.B hdb
+This is a variant of the BDB backend that uses a hierarchical database
+layout which supports subtree renames.
+.TP
.B ldap
This backend acts as a proxy to forward incoming requests to another
LDAP server.
.BR ldap (3),
.BR slapd\-bdb (5),
.BR slapd\-dnssrv (5),
+.BR slapd\-hdb (5),
.BR slapd\-ldap (5),
.BR slapd\-ldbm (5),
.BR slapd\-ldif (5),