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           The slapd(8) daemon can use a variety of different backends for serving
           LDAP requests.  Backends may be compiled statically into slapd, or when
           module  support  is  enabled,  they may be dynamically loaded. Multiple
           instances of a backend can be configured, to serve  separate  databases
           from the same slapd server.
           Configuration options for each backend are documented separately in the
           corresponding slapd-<backend>(5) manual pages.
           bdb    This was the recommended primary backend through  OpenLDAP  2.3,
                  but  it  has since been superseded by the hdb backend.  It takes
                  care to  configure  it  properly.   It  uses  the  transactional
                  database  interface  of  the Oracle Berkeley DB (BDB) package to
                  store data.
           config This backend is used to manage the  configuration  of  slapd  at
                  run-time.   Unlike other backends, only a single instance of the
                  config backend may be defined. It also instantiates itself auto-
                  matically,  so  it  is  always  present  even  if not explicitly
                  defined in the slapd.conf(5) file.
           dnssrv This backend is experimental.  It serves up referrals based upon
                  SRV resource records held in the Domain Name System.
           hdb    This  is  the  recommended  primary  backend  for a normal slapd
                  database.  hdb is a variant of the bdb backend that uses a hier-
                  archical  database  layout.   This  layout stores entry DNs more
                  efficiently than the bdb backend, using less space and requiring
                  less  work to create, delete, and rename entries. It is also one
                  of the few backends to support subtree renames.
           ldap   This backend acts as a proxy to  forward  incoming  requests  to
                  another LDAP server.
           ldif   This database uses the filesystem to build the tree structure of
                  the database, using plain ascii files to store data.  Its  usage
                  should be limited to very simple databases, where performance is
                  not a requirement. This backend also supports subtree renames.
           mdb    This will soon be the recommended primary  backend,  superseding
                  hdb.    This  backend  uses  OpenLDAP's  own  MDB  transactional
                  database library. It is extremely compact  and  extremely  effi-
                  cient,  delivering  much higher performance than the Berkeley DB
                  backends while using significantly less  memory.   Also,  unlike
                  Berkeley  DB, MDB is crash proof, and requires no special tuning
                  or maintenance.  This backend also supports subtree renames.
           meta   This backend performs basic LDAP proxying with respect to a  set
                  of  remote  LDAP servers. It is an enhancement of the ldap back-
           passwd This backend is provided for demonstration  purposes  only.   It
                  serves  up  user  account  information from the system passwd(5)
           perl   This backend embeds a perl(1) interpreter into slapd.   It  runs
                  Perl subroutines to implement LDAP operations.
           relay  This  backend  is experimental.  It redirects LDAP operations to
                  another database in the same server, based on the naming context
                  of   the  request.   Its  use  requires  the  rwm  overlay  (see
                  slapo-rwm(5) for details) to rewrite the naming context  of  the
                  request.  It is primarily intended to implement virtual views on
                  databases that actually store data.
           shell  This backend executes external programs to implement LDAP opera-
                  tions.  It is primarily intended to be used in prototypes.
           sql    This backend is experimental.  It services LDAP requests from an
                  SQL database.


                  default slapd configuration file
                  default slapd configuration directory


           ldap(3), slapd-bdb(5), slapd-config(5), slapd-dnssrv(5),  slapd-hdb(5),
           slapd-ldap(5),  slapd-ldif(5), slapd-mdb(5), slapd-meta(5), slapd-moni-
           tor(5), slapd-ndb(5),  slapd-null(5),  slapd-passwd(5),  slapd-perl(5),
           slapd-relay(5),     slapd-shell(5),     slapd-sql(5),    slapd.conf(5),
           slapd.overlays(5),   slapd(8).    "OpenLDAP   Administrator's    Guide"


           OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
           <>.  OpenLDAP Software is derived from  Univer-
           sity of Michigan LDAP 3.3 Release.

    OpenLDAP 2.4.40 2014/09/20 SLAPD.BACKENDS(5)


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