.B bdb
This was the recommended primary backend through OpenLDAP 2.3, but it has
since been superseded by the
-.BR hdb
+.BR mdb
backend. It takes care to configure it properly.
It uses the transactional database interface of the Oracle Berkeley
DB (BDB) package to store data.
Domain Name System.
.TP
.B hdb
-This is the recommended primary backend for a normal slapd database.
+This was the recommended primary backend through OpenLDAP 2.4.40 but it has
+since been superseded by the
+.BR mdb
+backend. It takes care to configure it properly.
.B hdb
is a variant of the
.B bdb
is not a requirement. This backend also supports subtree renames.
.TP
.B mdb
-This will soon be the recommended primary backend, superseding
+This is the recommended primary backend, superseding
.BR hdb .
This backend uses OpenLDAP's own MDB transactional database
library. It is extremely compact and extremely efficient, delivering