Unwired Accelerator uses optimistic concurrency control. This allows users to make changes to records on their local devices, but at sync time, the mobile portal server rejects an update operation if the data submitted for modification has already been modified by another user in the enterprise. For example, if four users change the same record and perform the sync operation, only the first user’s sync is executed, and the other three users’ update requests are rejected.
During sync, the PDA devices return the original value (the value before the change) of the updated record columns, the new value for the columns, and all the search parameter values defined in the updated application, to the linked application of the mobile portal server. See “Application update links”.
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