Chapter 5. Working with Disconnected Data

One challenge related to data access is that two or more users might need to access data in a given database simultaneously. For example, one user might be performing a task such as editing a customer record while another user is performing a different task, such as running a report of active customers. It is important to prevent two users from editing a record at the same time and to prevent reports from showing data that is half-complete.

Another data access issue is that users want the ability to access data from anywhere. We live in a mobile environment, where people want to access data on their laptops, cell phones, and PDAs. Many of these devices have limited communication capability, which adds to ...

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