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 Description: the DBMS can be used to control the number of locks on the data, of the visit : When the procedures to access data items, data items to give locked. If it is read-only data, usually sharing locks, such other matters can also read the data item. And if this procedure is to amend the data, it will give information on items exclusive lock, other programs at this time, it will not re-visit this item of data. For the same data, if a different procedure for a data item unlocked but at least there is an exclusive lock, it said they occurred in the conflict. When there is conflict, locked the request will be refused. Each request includes lockable three elements : Lock mode Service data item identifier and identifier. Two procedures can simultaneously lock data items, provided they are not in conf
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