Replication merge strategies

This topic describes the strategies for merging properties during replication import.

You can merge properties according to one of the following strategies:

Strategy	Description
Override	The new version is created solely based on data from an import file. Target server changes are overridden.
Merge without conflicts	The new version is created as a result of a properties merge from replication (source) and target servers. If a property was changed on either the target or source server, the merge result is successful and the updated property value is used. However, if conflicting changes were made to the property on the target and source servers, the system generates an error and cancels the import.
Merge with replication priority	This is the same as the Merge Without Conflicts strategy, but if a conflict occurs, it is resolved using the replication (source) server property change.
Merge with target server priority	This is the same as the Merge Without Conflicts strategy, but if a conflict occurs, it is resolved using the target server property change.

The following table demonstrates the results for each merge strategy using sample data. In this example, the properties have already been imported once from the replication (source) server to the target server.

Initial data before second import	Properties merge strategy and import result on a target server
On replication, or source (R)	On target (T)	Override	Without conflicts	Source priority	Target priority
No changes	No changes	No changes	No changes	No changes	No changes
No changes	Delete	Data restored from R	Data deleted	Data deleted	Data deleted
No changes	Edit	Data restored from R	Edited data from T	Edited data from T	Edited data from T
Delete	No changes	Data deleted	Data deleted	Data deleted	Data deleted
Delete	Delete	Data deleted	Data deleted	Data deleted	Data deleted
Delete	Edit	Data deleted	Conflict, stop import	Data deleted	Edited data from T
Edit	No changes	Edited data from R	Edit data from R	Edit data from R	Edited data from R
Edit	Delete	Edited data from R	Conflict, stop import	Edit data from R	Data deleted
Edit	Edit	Edited data from R	Conflict, stop import	Edit data from R	Edited data from T
Add data on R	Add data on T	Only added R data	Added R and T data	Added R and T data	Added R and T data

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See also:

• Object import strategies
• Plugins import strategies