SLAPO-SYNCPROV(5)             File Formats Manual            SLAPO-SYNCPROV(5)

       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 mandatory 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. 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 the
       University of Michigan LDAP 3.3 Release.

OpenLDAP 2.4.48                   2019/07/24                 SLAPO-SYNCPROV(5)