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           The  mdb backend to slapd(8) uses OpenLDAP's Lightning Memory-Mapped DB
           (LMDB) library to store data.  It relies completely on  the  underlying
           operating  system for memory management and does no caching of its own.
           It is the recommended primary database backend.
           The mdb backend is similar to the hdb backend in that it uses a hierar-
           chical  database layout which supports subtree renames. It is both more
           space-efficient and more  execution-efficient  than  the  bdb  backend,
           while being overall much simpler to manage.


           These  slapd.conf  options apply to the mdb backend database.  That is,
           they must follow a "database mdb" line and come before  any  subsequent
           "backend" or "database" lines.  Other database options are described in
           the slapd.conf(5) manual page.
           checkpoint <kbyte> <min>
                  Specify the frequency for flushing the  database  disk  buffers.
                  This setting is only needed if the dbnosync option is used.  The
                  checkpoint will occur if either <kbyte> data has been written or
                  <min> minutes have passed since the last checkpoint.  Both argu-
                  ments default to zero, in which case they are ignored. When  the
                  <min>  argument  is  non-zero,  an  internal task will run every
                  <min> minutes to perform the checkpoint.   Note:  currently  the
                  <kbyte> setting is unimplemented.
                  Specify that on-disk database contents should not be immediately
                  synchronized with in memory changes.  Enabling this  option  may
                  improve performance at the expense of data security. In particu-
                  lar, if the operating system crashes before changes are flushed,
                  some  number  of  transactions  may be lost.  By default, a full
                  data flush/sync is performed when each transaction is committed.
           directory <directory>
                  Specify  the  directory  where  the  LMDB  files containing this
                  database and associated indexes live.  A separate directory must
                  be  specified  for  each  database.   The default is /var/openl-
           envflags {nosync,nometasync,writemap,mapasync,nordahead}
                  Specify flags for finer-grained control of  the  LMDB  library's
                  nosync This is exactly the same as the dbnosync directive.
                         Flush the data on a commit, but skip the sync of the meta
                         on each commit, use an asynchronous flush  instead  of  a
                         synchronous  flush  (the  default).  This  option  has no
                         effect if writemap has not  been  set.  It  also  has  no
                         effect if nosync is set.
                         Turn  off  file readahead. Usually the OS performs reada-
                         head on every read request. This usually boosts read per-
                         formance but can be harmful to random access read perfor-
                         mance if the system's memory is full and the DB is larger
                         than RAM. This option is not implemented on Windows.
           index {<attrlist>|default} [pres,eq,approx,sub,<special>]
                  Specify the indexes to maintain for the given attribute (or list
                  of attributes).   Some  attributes  only  support  a  subset  of
                  indexes.   If only an <attr> is given, the indices specified for
                  default are maintained.  Note that setting a  default  does  not
                  imply  that  all attributes will be indexed. Also, for best per-
                  formance, an eq  index  should  always  be  configured  for  the
                  objectClass attribute.
                  A  number  of  special  index  parameters may be specified.  The
                  index type sub can be decomposed  into  subinitial,  subany, and
                  subfinal  indices.   The special type nolang may be specified to
                  disallow use of this index by language  subtypes.   The  special
                  type  nosubtypes  may be specified to disallow use of this index
                  by  named  subtypes.    Note:   changing   index   settings   in
                  slapd.conf(5)  requires  rebuilding  indices,  see slapindex(8);
                  changing index settings dynamically by LDAPModifying "cn=config"
                  automatically causes rebuilding of the indices online in a back-
                  ground task.
           maxreaders <integer>
                  Specify the maximum number of threads that may  have  concurrent
                  read  access  to  the database. Tools such as slapcat count as a
                  single thread, in addition to threads in any active  slapd  pro-
                  cesses. The default is 126.
           maxsize <bytes>
                  Specify  the maximum size of the database in bytes. A memory map
                  of this size is allocated at startup time and the database  will
                  not be allowed to grow beyond this size. The default is 10485760
                  bytes. This setting may be  changed  upward  if  the  configured
                  limit needs to be increased.
                  Note:  It is important to set this to as large a value as possi-
                  ble, (relative to anticipated growth of  the  actual  data  over
                  time) since growing the size later may not be practical when the
                  system is under heavy load.
           mode <integer>
                  stack  uses 512K bytes per level. The default stack depth is 16,
                  thus 8MB per thread is used.


           The mdb  backend  honors  access  control  semantics  as  indicated  in


                  default slapd configuration file


           slapd.conf(5),   slapd-config(5),   slapd(8),  slapadd(8),  slapcat(8),
           slapindex(8), OpenLDAP LMDB documentation.


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

    OpenLDAP 2.4.40 2014/09/20 SLAPD-MDB(5)


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