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       slapd-bdb - BDB backend to slapd




       The  BDB  backend  to  slapd(8) is the recommended backend for a normal
       slapd database.  However, it takes more care than with the LDBM backend
       to  configure  it  properly.   It  uses the Sleepycat Berkeley DB (BDB)
       package to store data.  It makes extensive use of indexing and  caching
       to speed data access.

       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


       These  slapd.conf  options apply to the BDB backend database.  That is,
       they must follow a "database bdb" 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 cache maintained by
              the BDB backend database instance.  The default is 1000 entries.

       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>
              minutes have passed since the last checkpoint.   Both  arguments
              default  to  zero,  in  which  case  they  are ignored.  See the
              Berkeley DB reference guide for more details.

              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.

       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

              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
              performance, 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.

       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.

       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.

              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  requires
              rebuilding indices, see slapindex(8).

       lockdetect {oldest|youngest|fewest|random|default}
              Specify  which transaction to abort when a deadlock is detected.
              The default is the same as 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
              evaluation.   Search  filters  are  evaluated  on  a  stack   to
              accommodate  nested  AND  /  OR  clauses. An individual stack is
              assigned  to  each  server  thread.   The  depth  of  the  stack
              determines  how  complex  a  filter  can  be  evaluated  without
              requiring any additional memory  allocation.  Filters  that  are
              nested  deeper than the search stack depth will cause a separate
              stack to be allocated  for  that  particular  search  operation.
              These  allocations  can  have  a major negative impact on server
              performance, but specifying too much stack will also  consume  a
              great  deal  of  memory.   Each search stack uses 512K bytes per
              level. The default stack depth is 16, thus  8MB  per  thread  is

       shm_key <integer>
              Specify  a  key  for a shared memory BDB environment. By default
              the BDB environment uses memory  mapped  files.  If  a  non-zero
              value  is  specified,  it  will be used as the key to identify a
              shared memory region that will house the environment.

       sessionlog <sid> <limit>
              Specify  a  session  log  store  for  the  syncrepl  replication
              provider  server.  The session log store contains information on
              the  entries  that  have  been  scoped  out  of   the   provider
              replication  content identified by <sid>.  The number of entries
              in the session log  store  is  limited  by  <limit>.   Excessive
              entries  are  removed  from  the  store in the FIFO order.  Both
              <sid> and <limit> are non-negative integers.  <sid> has no  more
              than   three   decimal   digits.    Refer   to   the   "OpenLDAP
              Administrator’s Guide" for detailed information on setting up  a
              replicated   slapd   directory   service   using   the  syncrepl
              replication engine and the session log store.


              default slapd configuration file

              Berkeley DB configuration file


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