How to implement transactions in appian

I have a process like this. I want to use transaction constraints on three write record nodes. Is there some easy way I can implement my require. 

 

another question is what the functional of sync records. 

I have read this document. https://docs.appian.com/suite/help/25.2/Sync_Records_Smart_Service.html But I don't understand the node's function and what scenario will use this node. I think when I use the write records, the data has already update into the database and sync automatically, why I need this node.

 

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