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           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 shut-
           down and read into memory on startup, and maintained in  memory  there-
           after.  Checkpoints  may be configured to write the contextCSN into the
           underlying database to minimize recovery time after  an  unclean  shut-
           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. Check-
                  pointing 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> speci-
                  fies 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 syn-
                  crepl 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

    OpenLDAP 2.4.40 2014/09/20 SLAPO-SYNCPROV(5)


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