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
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.
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.
This page is part of the OpenLDAP (an open source implementation of
the Lightweight Directory Access Protocol) project. Information
about the project can be found at ⟨http://www.openldap.org/⟩. If you
have a bug report for this manual page, see
⟨http://www.openldap.org/its/⟩. This page was obtained from the
project's upstream Git repository
⟨git://git.openldap.org/openldap.git⟩ on 2017-03-13. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
OpenLDAP LDVERSION RELEASEDATE SLAPO-SYNCPROV(5)