Incremental Synchronisation mode of Data Sync improves the efficiency when dealing with large data sets. Data Sync has a unique approach whilst maintaining the state-less operation ensuring a reliable synchronisation process. Incremental mode allows data sync to load a subset of records from the Source and match these against the Target and run the normal reconciliation to generate the change set. Because of this mode of operation is it not possible to detect DELETE operations with Incremental Mode enabled. Not all providers support incremental mode however the following list of providers have incremental support enabled.
Incremental mode supports a single key column i.e. you cannot use a composite key column with Incremental Mode.
To enable incremental mode is as simple as setting the option to SyncAtoBIncremental in Project -> Properties
This then changes the behaviour of Data Sync to load only matching records from the Target based on the Key column selection in the schema map. Because of this Incremental mode should only be used when.
If the source returns a large data set then the performance of incremental mode is not optimal due to the round trips required to the target to retrieve the records, Data Sync does optimize this by using batching and multiple threads where it can.
This mode of operation would usually be used with a View or CRM FetchXMLFilter Expression that limits the source records.
When Incremental mode is used with DS3 Automation Server (Ouvvi) you can dynamically adjust the source filtering based on a value supplied by the Server. The server will inject some Project Properties into the Project Properties collection. The property Auto_LastSuccessfulRun value is the Timestamp from DS3 Server when the project was last run.
If you combine this with Project Automation you can adjust your data source properties at runtime, for example to update the Where clause of a SQL Provider you might use the code below in Project Automation.