11.2 Need for Concurrency Control
One of the major objectives in developing an enterprise database is to create an information resource that can be shared by many users. If transactions execute one at a time, serially, with each transaction doing a commit before the next one begins, there is no problem of interference with one another’s transactions. However, users often need to access data simultaneously. The objective of a concurrency control system is to allow as much simultaneous processing as possible, without having transactions interfere with one another. If all users are only reading data, there is no way they can interfere with one another and there is no need for concurrency control. If users are accessing different parts of the database, ...
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