Filter
Top Products
Chapter 2 • Synchronizing at a Glance
41
Incremental Synchronizations
You run an incremental synchronization on a link to determine which
records in the endpoints were created or modified since the previous
synchronization task, and then synchronize data between the two
endpoints according to the mapping and settings you defined for the link.
➤ In an incremental synchronization, the Synchronizer first sends a request to
each endpoint to supply a list of records created or modified since the time
indicated by the time stamp for the link. The time stamp for a link is the
time the last synchronization task started running. The endpoint supplies
this list by comparing the time stamp for the link with the time each record
was last modified as recorded by the endpoint. If a record was modified after
the time indicated by the time stamp for the link, it is included in the list.
➤ If a record that is included in the list for one of the endpoints is not
previously known to the Synchronizer, and therefore does not appear in the
identity map table for the link, the Synchronizer infers that the record was
created after the last synchronization. If you enabled record creation in the
other endpoint, the Synchronizer creates a corresponding record in that
endpoint and updates the identity map table to include this
correspondence.
➤ If a record in the list already appears in the identity map table for the link,
and the record’s version is different from the version in the identity
mapping record, the Synchronizer infers that the record has been updated
since the last synchronization. The Synchronizer then performs a cycle
redundancy check to determine if fields included in the mapping were
modified and require synchronization. If synchronization is necessary, the
Synchronizer updates the corresponding record in the other endpoint,
depending on the settings for the link.