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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.
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)