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Two actions on the same data object, modified by different transactions, conflict, if at least one of them is a write. The three anomalous situations can be described in terms of when the actions of two transactions T1 and T2 conflict with each other: in a write-read (WR) conflict T2 reads a data object previously written by T1; we define read-write (RW) and write-write (WW) conflicts similarly.

Description

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