DBMS control systems to share data in the same time, there are several ways, such as lock-based protocols, for example, the size of the data item to be locked with the DB space, page, table, row, and column for the item that is locked. If the item is small, it has a higher throughput, but management is difficult and resource-intensive, usually DBMS good quality locks unit that small before, including column and check that the row has a conflict or not, if not, it will lock a row and then continue. to table
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