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           The  bdb  backend to slapd(8) uses the Oracle Berkeley DB (BDB) package
           to store data.  It makes extensive use of indexing and caching to speed
           data access.
           Note  that  BDB  is  deprecated  and  support will be dropped in future
           OpenLDAP releases. Installations should use the mdb backend instead.
           hdb is a variant of the bdb backend that uses a  hierarchical  database
           layout  which supports subtree renames. It is both more space-efficient
           and more execution-efficient than the bdb  backend.   It  is  otherwise
           identical  to  the bdb behavior, and all the same configuration options
           It is noted that these options are intended to complement  Berkeley  DB
           configuration  options  set  in  the environment's DB_CONFIG file.  See
           Berkeley  DB  documentation  for  details  on  DB_CONFIG  configuration
           options.   Where  there  is  overlap, settings in DB_CONFIG take prece-


           These slapd.conf options apply to the bdb  and  hdb  backend  database.
           That  is,  they must follow a "database bdb" or "database hdb" line and
           come before  any  subsequent  "backend"  or  "database"  lines.   Other
           database options are described in the slapd.conf(5) manual page.
           cachesize <integer>
                  Specify  the  size in entries of the in-memory entry cache main-
                  tained by the bdb or hdb backend database instance.  The default
                  is 1000 entries.
           cachefree <integer>
                  Specify  the number of entries to free from the entry cache when
                  the cache reaches the cachesize limit.  The default is 1  entry.
           checkpoint <kbyte> <min>
                  Specify the frequency for checkpointing the database transaction
                  log.  A checkpoint operation flushes  the  database  buffers  to
                  disk  and writes a checkpoint record in the log.  The checkpoint
                  will occur if either <kbyte> data has been written or <min> min-
                  utes  have  passed  since  the  last checkpoint.  Both arguments
                  default to zero, in which case they are ignored. When the  <min>
                  argument is non-zero, an internal task will run every <min> min-
                  utes to perform the checkpoint.  See the Berkeley  DB  reference
                  guide for more details.
                  Enable  checksum  validation  of DB pages whenever they are read
                  from disk.  This setting  can  only  be  configured  before  any
                  This  option  may  be  used  when  a  separate  cryptfile is not
                  desired. Only one of cryptkey or cryptfile may be configured.
           dbconfig <Berkeley-DB-setting>
                  Specify a configuration directive to be placed in the  DB_CONFIG
                  file of the database directory. The dbconfig directive is just a
                  convenience to allow all necessary configuration to  be  set  in
                  the  slapd.conf file.  The options set using this directive will
                  only be written to the DB_CONFIG file if no such file existed at
                  server startup time, otherwise they are completely ignored. This
                  allows one to set initial values without  overwriting/destroying
                  a  DB_CONFIG  file  that  was  already  customized through other
                  means.  This directive  may  be  specified  multiple  times,  as
                  needed.  For example:
                       dbconfig set_cachesize 0 1048576 0
                       dbconfig set_lg_bsize 2097152
                  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.  See the
                  Berkeley DB reference guide for more details.
           dbpagesize  <dbfile> <size>
                  Specify the page size to use for a particular database file,  in
                  units  of  1024  bytes. The default for the id2entry file is 16,
                  the default for all other files  depends  on  the  size  of  the
                  underlying filesystem's block size (typically 4 or 8).  The max-
                  imum that BerkeleyDB supports is 64. This setting usually should
                  not need to be changed, but if BerkeleyDB's "db_stat -d" shows a
                  large amount of overflow pages in  use  in  a  file,  setting  a
                  larger  size  may  increase  performance  at the expense of data
                  integrity. This setting only takes effect  when  a  database  is
                  being  newly  created.  See  the Berkeley DB reference guide for
                  more details.
           directory <directory>
                  Specify the  directory  where  the  BDB  files  containing  this
                  database and associated indexes live.  A separate directory must
                  be specified for each  database.   The  default  is  /var/openl-
                  Allow  reads  of  modified  but not yet committed data.  Usually
                  transactions are  isolated  to  prevent  other  operations  from
                  accessing  uncommitted  data.   This  option may improve perfor-
                  mance, but may also return  inconsistent  results  if  the  data
                  comes  from  a transaction that is later aborted.  In this case,
                  the modified data is discarded  and  a  subsequent  search  will
                  return a different result.
           dncachesize <integer>
           idlcachesize <integer>
                  Specify the size of the in-memory index cache, in  index  slots.
                  The  default  is  zero.  A  larger  value will speed up frequent
                  searches of indexed entries. An hdb database needs a large  idl-
                  cachesize for good search performance, typically three times the
                  cachesize (entry cache size) or larger.
           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.
                  Tell slapindex to index one attribute at a time. By default, all
                  indexed attributes in an entry are processed at the  same  time.
                  With  this option, each indexed attribute is processed individu-
                  ally, using multiple passes through the  entire  database.  This
                  option  improves  slapindex  performance  when the database size
                  exceeds the dbcache size. When the dbcache is large enough, this
                  option  is  not  needed  and will decrease performance.  Also by
                  default, slapadd  performs  full  indexing  and  so  a  separate
                  slapindex  run  is not needed. With this option, slapadd does no
                  indexing and slapindex must be used.
           lockdetect {oldest|youngest|fewest|random|default}
                  Specify which transaction to abort when a deadlock is  detected.
                  The default is random.
           mode <integer>
                  Specify  the  file  protection  mode that newly created database
                  index files should have.  The default is 0600.
           searchstack <depth>
                  Specify the depth of the stack used for  search  filter  evalua-
                  tion.   Search  filters  are evaluated on a stack to accommodate
                  nested AND / OR clauses. An individual stack is assigned to each
                  shared memory region that will house the environment.


           The bdb and hdb backends honor access control semantics as indicated in


                  default slapd configuration file
                  Berkeley DB configuration file


           slapd.conf(5),  slapd-config(5),  slapd-mdb(5),  slapd(8),  slapadd(8),
           slapcat(8), slapindex(8), Berkeley DB documentation.


           OpenLDAP Software is developed and maintained by The  OpenLDAP  Project
           <>.   OpenLDAP Software is derived from Univer-
           sity of Michigan LDAP 3.3 Release.  Originally begun by Kurt  Zeilenga.
           Caching  mechanisms  originally  designed by Jong-Hyuk Choi. Completion
           and subsequent work, as well as back-hdb, by Howard Chu.

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


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