=== slapd-mdb ===
The mdb backend to slapd(8) is the upcoming primary backend for a normal slapd database. It uses OpenLDAP's own Lightning Memory-Mapped Database (LMDB) library to store data and is intended to replace the Berkeley DB backends.
It supports indexing like the BDB backends, but it uses no caching and requires no tuning to deliver maximum search performance. Like hdb, it is also fully hierarchical and supports subtree renames in constant time.
[http://www.openldap.org/software/man.cgi?query=slapd-mdb&apropos=0&sektion=0&manpath=OpenLDAP+2.4-Release&format=html slapd-mdb] - Memory-Mapped DB backend to slapd
cd /root