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Replication is a process of synchronizing data between two systems. Examples of these systems are SAP R/3 to SAP CRM and SAP CRM to mobile client. There are two types of replication -- bulk replication and intelligent replication. The message Bdocs uses bulk replication (ex: R/3 to CRM) and synchronization Bdocs uses intelligent replication (ex: SAP CRM to mobile client).
Meanwhile, realignment is redistribution of data between mySAP CRM and mobile clients based on subscriptions. This is to ensure the distributed databases (mobile client databases) remain consistent with the consolidated database (CDB).
The two types of realignment are called minor realignment and major realignment. Minor realignment is triggered by data changes (ex: change of a field value). Major realignment is triggered when there are changes to the mobile client subscriptions. In this case, creation or deletion of BDoc messages will be replicated to the mobile client based on the subscription changes.
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