A data transaction system allows performing a transaction related to a data unit, where the data unit can be independently saved and retrieved, from an upper layer to {TAIL ~ a storage layer} without causing a database deadlock related to {HEAD ~ the data unit} in the storage layer 
A data transaction system allows performing a transaction related to a data unit , where the data unit can be independently saved and retrieved , from an upper layer to { TAIL ~ a storage layer } without causing a database deadlock related to { HEAD ~ the data unit } in the storage layer
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