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       slapo-syncprov - Sync Provider overlay to slapd




       The  Sync Provider overlay implements the provider-side support for the
       LDAP Content Synchronization (RFC4533) as well as syncrepl  replication
       support.   The  overlay  can  be  used  with any backend that maintains
       entryCSN and entryUUID attributes for its entries. It  also  creates  a
       contextCSN attribute in the root entry of the database.

       The  contextCSN  is updated for every write operation performed against
       the database. To reduce database contention,  the  contextCSN  is  only
       updated  in  memory.  The  value  is  written to the database on server
       shutdown and read into memory on  startup,  and  maintained  in  memory
       thereafter.  Checkpoints may be configured to write the contextCSN into
       the underlying database to minimize  recovery  time  after  an  unclean

       On  databases that support inequality indexing, it is helpful to set an
       eq index on the entryCSN attribute when using this overlay.


       These slapd.conf options apply to  the  Sync  Provider  overlay.   They
       should appear after the overlay directive.

       syncprov-checkpoint <ops> <minutes>
              After  a  write operation has succeeded, write the contextCSN to
              the underlying database if <ops> write operations or  more  than
              <minutes>   time   have   passed   since  the  last  checkpoint.
              Checkpointing is disabled by default.

       syncprov-sessionlog <ops>
              Configures an in-memory session log  for  recording  information
              about   write  operations  made  on  the  database.   The  <ops>
              specifies the number of operations that are recorded in the log.
              All  write  operations  (except  Adds)  are recorded in the log.
              When using the session log, it is helpful to set an eq index  on
              the entryUUID attribute in the underlying database.

       syncprov-nopresent TRUE | FALSE
              Specify  that the Present phase of refreshing should be skipped.
              This value should only be set TRUE for a  syncprov  instance  on
              top  of  a  log  database  (such as one managed by the accesslog
              overlay).  The default is FALSE.

       syncprov-reloadhint TRUE | FALSE
              Specify that the overlay should honor the reloadHint flag in the
              Sync  Control.  In  OpenLDAP  releases  2.3.11  and  earlier the
              syncrepl consumer did not properly set this flag, so the overlay
              must ignore it. This option should be set TRUE when working with
              newer releases that properly support this flag. It must  be  set
              TRUE  when  using the accesslog overlay for delta-based syncrepl
              replication support.  The default is FALSE.


              default slapd configuration file


       slapd.conf(5),    slapd-config(5),    slapo-accesslog(5).      OpenLDAP
       Administrator's Guide.


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